Houston weather is the single biggest adjustment for most newcomers. It is not merely "hot." It is a combination of heat, humidity, flooding risk, hurricane exposure, and power grid uncertainty that few other major American cities share. This guide is the version nobody sugarcoats.
Houston weather is not just hot. From June through September it is a wet blanket of humidity that wraps around you the moment you step outside. The heat index is what matters: on a typical July or August afternoon it averages about 98°F, and on the hottest days it climbs higher.
The Humidity Truth
Houston's climate follows a distinct annual rhythm. Understanding it helps with everything from choosing when to move, to planning outdoor activities, to budgeting for electricity, and for the hurricane months Ready.gov keeps the federal preparation checklist. Here is what each month looks like.
| Month | Avg High | Avg Low | Rain (in) | Humidity | Outdoor Rating |
|---|---|---|---|---|---|
| January | 64F | 44F | 3.8 | 71% | Good |
| February | 68F | 48F | 3.0 | 71% | Good |
| March | 74F | 54F | 3.5 | 70% | Excellent |
| April | 80F | 60F | 4.0 | 71% | Excellent |
| May | 87F | 68F | 5.0 | 73% | Okay |
| June | 92F | 74F | 6.0 | 73% | Poor |
| July | 95F | 76F | 3.8 | 73% | Poor |
| August | 95F | 75F | 4.8 | 72% | Poor |
| September | 90F | 71F | 4.7 | 73% | Poor |
| October | 83F | 61F | 5.5 | 73% | Excellent |
| November | 73F | 52F | 3.9 | 73% | Great |
| December | 65F | 46F | 4.0 | 73% | Good |
Humidity runs much higher at dawn (about 84 to 92 percent) than in mid-afternoon (about 50 to 55 percent). Average highs do not capture the hottest days.
The table above shows averages, and averages can mislead in Houston. At 94°F and 55 percent relative humidity, the National Weather Service heat index formula gives about 106°F. In winter, a mild afternoon can give way to a cold night when a strong front passes. Houston weather swings more than the averages suggest.
The practical takeaway: October through April is when Houston shines. These seven months have genuinely pleasant weather, with long stretches of days in the 60s, 70s and low 80s and far less muggy air. May is the transition month when the heat builds. June through September is when the city goes into summer mode: life moves indoors, electricity bills climb, and outdoor activities shift to early morning or late evening.
October through April is Houston's reward for surviving summer
Houston summers are not a minor inconvenience. They are a genuine lifestyle challenge that requires adaptation. If you are moving from a northern climate, the Pacific Northwest, or even a dry-heat city like Phoenix, Houston's summer humidity will be unlike anything in your experience. Here is how residents actually survive it.
The core issue is not temperature. It is humidity. Dry heat lets sweat evaporate and cool your body. In a Houston summer, dew points average about 72 to 73°F and relative humidity runs about 90 percent at dawn (our calculation from NOAA hourly normals), so sweat sits on your skin and your body's cooling system works less well. On a humid afternoon the heat index, the National Weather Service's measure of how hot it feels, can run 10 degrees or more above the air temperature. Walking from your car to a building 200 feet away can leave you drenched.
This is not an exaggeration intended to scare you. It is a physical reality that affects daily decisions. You will choose restaurants based on parking proximity. You will change clothes after walking to lunch. You will keep a towel in your car. These adaptations become automatic within your first summer, but the initial shock is real.
Morning and evening outdoor time: Runners, dog walkers, and outdoor fitness people in Houston shift to early morning or evening during summer. Even at 6 AM in July, the normal temperature at Bush Intercontinental is about 76°F (NOAA hourly normals), but that beats the afternoon. Parks that are busy in October are quiet at noon in August.
The AC lifestyle: Houstonians move from air-conditioned home to air-conditioned car to air-conditioned office to air-conditioned restaurant. This is not laziness. It is how the city works in summer, and indoor venues become the default for errands and entertainment.
Car management: The National Weather Service office for Houston warns that the temperature inside a parked vehicle can rise 20 degrees in as little as 10 minutes and approach 150°F in as little as an hour. Steering wheels and leather seats get hot enough to burn skin. Windshield sun shades are worth buying on day one, remote start (to run the AC before you get in) is popular, and covered parking is a real perk. Never leave a child or pet in a parked car.
Electricity bills: Air conditioning drives the summer electricity bill, and bills from June through September run well above the rest of the year, especially in larger or poorly insulated homes. Budget for it before you sign a lease or buy; it is not a minor line item.
Atlantic hurricane season runs from June 1 through November 30. The National Hurricane Center puts the peak on September 10, with most activity between mid-August and mid-October. Houston is not hit every year, and many seasons pass with no direct impact. But when a storm does affect the Houston metro, the consequences can be life-altering. Flat land, proximity to the Gulf of Mexico, and drainage that heavy rain can overwhelm make flooding the main threat, even from storms that never make landfall near the city.
Before Season (May): Prepare Your Kit
Assemble a disaster kit along Ready.gov lines: water (one gallon per person per day for several days), non-perishable food for several days, a flashlight, spare batteries, a battery-powered or hand-crank radio, a first aid kit, prescription medications, cash, copies of important documents in a waterproof container, and a phone charger with a backup battery. Identify your evacuation route and a place to stay.
Hurricane Watch (About 48 Hours Out)
The National Hurricane Center issues a hurricane watch 48 hours before it expects tropical-storm-force winds. Follow its forecasts closely. Fill your gas tank early, before lines form. Fill bathtubs with water for flushing toilets if water pressure fails. Charge all devices. Move vehicles to higher ground if you are in a flood-prone area. Stock up on groceries before the rush.
Hurricane Warning (About 36 Hours Out)
A hurricane warning comes 36 hours before tropical-storm-force winds are expected, and preparations should be finished. If authorities order an evacuation for your zone, leave. Do not wait. The Hurricane Rita evacuation in 2005, when up to 2 million residents left, most of them from the Houston and Galveston area (National Weather Service), showed how hard a mass evacuation is. Evacuation orders are now issued by ZIP-code zone, and TxDOT's Houston evacuation map marks potential contraflow routes. If staying, bring outdoor furniture inside, close storm shutters, and fill extra water containers.
During the Storm
Stay indoors. Do not drive through flooded roads. "Turn Around, Don't Drown" is not a suggestion: the National Weather Service says just 12 inches of rushing water can carry away most cars. Monitor local media and Harris County Flood Control District updates. If water enters your home, move to the second floor if available. Call 911 only for life-threatening emergencies, because the system can be overwhelmed during major storms.
After the Storm: Recovery
Do not return to flooded areas until authorities give the all-clear. Document all damage with photographs for insurance claims. Avoid downed power lines. Boil water advisories may be in effect. The EPA advises drying water-damaged areas and items within 24 to 48 hours to prevent mold growth. Contact your insurance company, and FEMA if applicable.
Houston is flat: ground elevations in Harris County run from sea level by Galveston Bay to over 300 feet in the far northwest corner (Harris County Flood Control District). Bush Intercontinental averages about 52 inches of rain a year, and the Flood Control District says a major flood happens somewhere in the county about every two years. Some neighborhoods flood regularly. Others almost never do. The difference can be a single block. Before signing any lease or buying any home, check FEMA flood maps at msc.fema.gov and the Flood Control District's Harvey inundation maps, and ask neighbors directly. This is not optional research. It is the most important housing decision you will make.
Flooding is the risk that defines Houston more than any other weather factor. It is not a theoretical concern. It is a recurring event that has shaped the city's infrastructure, real estate market, housing policy, and collective psyche. If you are relocating to Houston, understanding flooding is more important than understanding any other single topic in this entire city guide.
Houston sits on a flat coastal plain. Ground elevations in Harris County range from sea level near Galveston Bay to over 300 feet in the northwest corner of the county, spread across 1,777 square miles, so water drains slowly. It runs off through 23 primary watersheds and about 2,500 miles of channels, up from roughly 800 miles of natural channels, and only about 6 percent of those channels are concrete-lined (Harris County Flood Control District). In the biggest storms, even that network cannot carry the water fast enough.
Development has compounded the problem. Prairie and wetland that once soaked up rain have been covered with roofs and pavement, and the Flood Control District says most flooding happens in areas developed before today's understanding of flood potential. When very heavy rain falls in a few hours, the water has nowhere to go. It overwhelms the bayous, backs up into streets, and enters homes and businesses.
The National Hurricane Center calls Hurricane Harvey, in August 2017, the most significant tropical cyclone rainfall event in United States history. Rain totals reached 36 to 48 inches in the Houston metro area, and the highest storm total, 60.58 inches, fell near Nederland in Southeast Texas. Nine of the 19 official river gauges in Harris County recorded all-time high flood stages. At least 160,000 structures flooded in Harris and Galveston counties, and more than 300,000 across Southeast Texas. FEMA reported about 30,000 water rescues, and NOAA's damage estimate is $125 billion.
Harvey did not just flood known flood-prone areas. The Hurricane Center notes that a majority of residential flood-loss claims came from outside the 500-year floodplain, where few owners carried flood insurance. In an extreme enough event, almost no part of Houston is guaranteed to stay dry. This is why flood insurance is recommended even for properties outside mapped flood zones.
Check FEMA flood maps before you sign anything. The Harris County Flood Control District publishes Harvey inundation maps, though it cautions that they do not necessarily show where structures flooded. Cross-reference both. Ask potential landlords and neighbors directly about flooding history. Drive through neighborhoods after a heavy rain to see where water pools. Choose properties with elevation above street level. Avoid homes adjacent to bayous, drainage channels, or detention ponds. And get flood insurance regardless of whether your lender requires it.
Most homeowners and renters insurance policies do not cover flood damage (FEMA FloodSmart). This surprises many newcomers. Flood insurance is bought separately, through the National Flood Insurance Program (NFIP) or a private insurer. An NFIP policy typically has a 30-day waiting period before coverage begins, so do not wait until a storm is in the Gulf. Premiums are set by each property's own flood risk, so get a quote for the exact address and add it to your housing budget.
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Most of Texas runs on a grid managed by the Electric Reliability Council of Texas (ERCOT), which serves more than 27 million customers and about 90 percent of the state's electric load, under oversight from the Public Utility Commission of Texas and the Legislature. The U.S. Energy Information Administration describes ERCOT as one of three main U.S. interconnections that operate largely independently, with limited transfers of power between them. In practice, Texas cannot lean heavily on neighboring states in an emergency.
Winter Storm Uri in February 2021 exposed the weakness of this system. In the joint review by federal regulators (FERC) and the grid reliability body NERC, extreme cold and freezing precipitation caused generating units across Texas and the South Central U.S. to fail or cut output, while natural gas production fell sharply. Grid operators ordered the largest controlled firm load shed, or rotating outage, in U.S. history.
More than 4.5 million people in Texas lost power, some for as long as four days, while temperatures stayed below freezing for more than six days (FERC-NERC). The Texas Department of State Health Services confirmed 246 storm-related deaths, most of them from hypothermia.
Under Senate Bill 3, the Public Utility Commission of Texas adopted weather-preparedness rules that require power plants and transmission companies in the ERCOT region to meet winter and summer weatherization standards, with ERCOT inspecting facilities on site. ERCOT reported that it did not enter emergency operations during Winter Storm Elliott in December 2022, and that its thermal power plants performed well during Winter Storm Heather in January 2024, the first winter with the full weatherization rule in effect, even as demand set a new winter record. The grid's limited connections to the rest of the country have not changed.
Compare electricity plans on PowerToChoose.org, the Public Utility Commission's official shopping site, and consider a fixed-rate plan to avoid price spikes. Keep emergency supplies that include a portable battery bank or generator, flashlights, blankets, non-perishable food, and bottled water. Know how to shut off your home's water supply in case pipes freeze. If you are buying a home, a whole-house generator is worth pricing out.
Your wardrobe will change when you move to Houston. If you are coming from a northern climate, you will find that most of your winter clothing is unnecessary. Here is how to think about dressing for Houston weather.
Light, breathable, moisture-wicking
Layering is the strategy
If you have flexibility in your relocation timeline, the month you arrive significantly affects your first impression of the city and your practical ability to explore neighborhoods, set up your home, and establish routines.
| Name | Value |
|---|---|
| October (Best overall month) | 10/10 |
| March (Pleasant, RodeoHouston crowds) | 9/10 |
| November (Cool and dry) | 9/10 |
| April (Warm, some storms) | 8/10 |
| December (Mild, holiday season) | 7/10 |
| February (Cool, occasional freeze) | 7/10 |
| January (Cold front risk) | 6/10 |
| May (Humidity building) | 5/10 |
| September (Still hot, hurricane peak) | 3/10 |
| June (Summer begins, brutal) | 3/10 |
| July (Peak heat and humidity) | 2/10 |
| August (Worst month overall) | 1/10 |
October is our pick for the best month to move to Houston. Average highs drop to the low 80s, nights cool to the low 60s, the air dries out compared with summer, and the city comes alive with outdoor activities, festivals, and restaurant patio season. Pack rain gear, though: October averages about 5.5 inches of rain at Bush Intercontinental, among the wettest months of the year. You will see Houston at its best and have the motivation to explore during your critical first weeks.
If you must move during summer (June through August), set realistic expectations. You will not want to explore neighborhoods on foot. Apartment hunting will be done mostly by car with the AC running between stops. Your first impression of the city will be dominated by heat. This is Houston in summer mode, not the whole picture. Give it until October before forming permanent opinions.
Every Houston weather discussion focuses on the negatives, and they are real. But the flip side deserves equal attention. Houston winters are genuinely mild. While much of the country shovels snow and scrapes ice off windshields, Houstonians are eating lunch on patios and jogging along Buffalo Bayou.
Average winter highs at Bush Intercontinental are in the mid-60s (65°F in December, 64°F in January, 68°F in February). The airport averages about 43 nights a year at 40°F or colder and about 10 at or below freezing, most of them in December through February (NOAA 1991–2020 normals). If you are moving from the Midwest, Northeast, or Pacific Northwest, the absence of a traditional winter is a real change. You gain months of outdoor time that simply did not exist in your previous climate.
This mild winter is what makes Houston livable despite the summer. The annual equation works out: four difficult months of heat balanced by seven to eight months of pleasant-to-excellent weather. The first summer is the hardest. By your second year, most newcomers have their routines, and the rest of the year feels like a reward.
a year at Bush Intercontinental, most of them December through February (NOAA 1991–2020 normals)
Hurricanes and flooding get the headlines, but Houston also experiences routine severe weather that newcomers should understand.
Thunderstorms: Summer afternoon storms build quickly, dump heavy rain in a short burst, and move on. Lightning is frequent and dangerous. These storms are rarely catastrophic on their own, but they can flood streets within minutes. Keep an eye on radar during summer afternoons.
Tornadoes: Houston is not in traditional Tornado Alley, but tornadoes do occur, particularly during spring severe weather and in the outer bands of tropical storms. They are usually weaker than the large tornadoes of the Plains, but they can still cause significant damage. Mobile homes are the most exposed.
Heat advisories: The National Weather Service office for Houston/Galveston issues a heat advisory when the heat index may reach 108°F or the temperature 103°F, and an extreme heat warning when the heat index is expected to reach 113°F or the temperature 105°F. It may lower those thresholds early in the season or after power outages. During these events, older adults, outdoor workers, and people without AC face real health risks. Heat stroke is a medical emergency, so know the symptoms.
Hail: Hail is most common during spring thunderstorms, and large hail can damage vehicles and roofs. If you have a car and no covered parking, this is a risk worth considering. The Texas Department of Insurance says hail damage to your car is covered if your auto policy includes comprehensive coverage; liability-only policies do not repair your own car.
At Bush Intercontinental Airport, the average high in July and August is about 95°F, and the thermometer reaches 90°F or more on about 111 days a year and 100°F or more on about 7 (NOAA 1991–2020 climate normals). The bigger problem is humidity. Average relative humidity sits around 70 to 73 percent in every month, and on a typical July or August afternoon the heat index, or what the air feels like, averages about 98°F, higher on the hottest days. The National Weather Service office for Houston issues a heat advisory when the heat index is expected to reach 108°F. This is not dry desert heat where shade gives real relief. Air conditioning is essential from June through September.
Yes. The Atlantic hurricane season runs from June 1 through November 30, and the National Hurricane Center puts its peak on September 10, with most activity between mid-August and mid-October. The city does not get hit every year, but when it does, the consequences can be severe. Hurricane Harvey in 2017 dropped 36 to 48 inches of rain on the Houston metro area, and its highest storm total, 60.58 inches, fell near Nederland in Southeast Texas (National Hurricane Center). Tropical storms and hurricanes can bring storm surge to coastal areas (Galveston, Clear Lake) and extreme rainfall inland. Every Houston resident should have a hurricane plan, emergency supplies, and an understanding of their specific flood risk.
Parts of Houston flood with regularity. The Harris County Flood Control District says a major flood occurs somewhere in the county about every two years, and that most flooding is in areas developed before today's understanding of flood potential. The land is flat, and Bush Intercontinental averages about 52 inches of rain a year (NOAA). Flooding is also extremely location-specific: one street can flood while another a mile away stays dry. Before signing any lease or buying any home, check FEMA flood maps, the Flood Control District's Harvey inundation maps, and the property's own flood history. This is the most important housing research step for any Houston newcomer.
October through early December and March through April are Houston's best months. Average highs run from the mid-60s to the low 80s, the air is noticeably less muggy than in summer, and outdoor activities become enjoyable again. October brings the first real relief, with an average high of about 83°F and an average low of about 61°F, though it is also one of the rainier months, at about 5.5 inches on average at Bush Intercontinental (NOAA 1991–2020 normals). Spring is pleasant but can bring strong thunderstorms. If you have flexibility on when to move, aim for October, November or March.
Rarely. NOAA's 1991–2020 normals for Bush Intercontinental average 0.1 inch of snow a year, or about one day with measurable snow per decade. Freezing nights are more common: the airport averages about 10 a year at or below 32°F, most of them in December through February. When winter weather does reach Southeast Texas, the National Weather Service office in Houston notes that freezing rain and sleet are a lot more common than snow, so icy roads and bridges are the usual hazard. The February 2021 winter storm (Winter Storm Uri) was a historic and deadly event that exposed weaknesses in the Texas power grid. Events of that size are rare, but a few freezing nights each winter are normal.
Most of Texas runs on a grid managed by ERCOT (the Electric Reliability Council of Texas), which serves about 90 percent of the state's electric load. The U.S. Energy Information Administration describes the three main U.S. grids, ERCOT among them, as operating largely independently with limited transfers of power between them, so Texas cannot lean heavily on neighboring states in an emergency. In February 2021, more than 4.5 million people in Texas lost power, some for as long as four days, according to the federal FERC and NERC review. Since then the Public Utility Commission of Texas has adopted weather-preparedness rules for power plants and transmission lines, with on-site inspections by ERCOT. Choose a fixed-rate electricity plan, keep emergency supplies, and have a backup plan for extreme heat and cold.
If the home is in a FEMA Special Flood Hazard Area and the mortgage comes from a federally regulated or insured lender, flood insurance is required (FEMA FloodSmart). Even outside those areas, flood insurance is strongly recommended in Houston. Most homeowners and renters policies do not cover flood damage. After Harvey, a majority of residential flood-loss claims came from outside the 500-year floodplain, according to the National Hurricane Center. NFIP premiums are now priced on each property's own flood risk, so get a quote for the specific address before you commit, and factor it into your housing budget. A new policy typically has a 30-day waiting period.
Sponsor Disclosure: This content is editorially independent. Housing recommendations by Houston Corporate Housing , a paid sponsor. All opinions, recommendations, and neighborhood insights are our own.
By the RelocateMeTX Editorial Team How we source our data →
This guide is for informational purposes only and does not constitute professional financial, legal, or medical advice.
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