Houston, Texas, has a humid subtropical climate defined by long, hot summers, mild winters, and rain spread throughout the year. The annual average high is 80.5°F and the average low is 60.5°F, but those yearly numbers mask the real story: summers that feel punishing and winters that barely qualify as cold. If you’re planning a move, a visit, or just curious, here’s what Houston’s weather actually looks like across the year.
Summer Heat: May Through September
Houston’s summer is the dominant season, stretching roughly five months. Average highs climb above 86°F in May and don’t drop back below 90°F until October. July and August are the peak, with average highs of 94.5°F and 94.9°F respectively. Overnight lows during those months hover around 75°F, meaning the air never fully cools down. That lack of nighttime relief is one of the defining features of Houston summers.
What makes the heat harder to tolerate is the humidity. Houston sits about 50 miles from the Gulf of Mexico, and moisture from the coast keeps relative humidity high year-round. During summer, morning humidity regularly exceeds 90%, and even afternoon readings stay well above 50%. When you combine a 95°F day with that level of moisture, the heat index (what the temperature actually feels like on your skin) can push past 105°F or higher. Sweat doesn’t evaporate efficiently in humid air, so your body’s natural cooling system works poorly. This is why Houston summers feel significantly worse than the thermometer suggests.
Winter: Brief and Mild
Houston winters are short and generally warm by national standards. December and January average highs sit in the mid-60s, with lows dipping into the mid-40s. A typical winter day might feel like early fall in northern states.
Freezing temperatures do occur, but they’re infrequent. The median date for the first fall freeze is around December 20, and the last spring freeze falls around February 8. That gives Houston a freeze window of only about seven weeks in most years. Some winters pass with barely any freezing nights at all. Snow is rare enough to make the news when it happens. The city might see measurable snowfall once every several years, and accumulations almost never last more than a day.
That said, Houston isn’t immune to cold snaps. The February 2021 winter storm demonstrated that arctic air can reach the Gulf Coast with devastating results. These events are uncommon but worth knowing about if you’re preparing a home or garden for the area.
Spring and Fall
Spring and fall are Houston’s most comfortable stretches, though both are brief. March and April see highs in the 74°F to 80°F range with lows in the 50s and low 60s. November offers similar relief, with highs around 72°F. These transition months are when outdoor life in Houston is most pleasant, and locals treat them accordingly.
Spring does come with a tradeoff: it’s the start of severe weather season. March through May brings the highest risk for thunderstorms, and occasional tornado warnings aren’t unusual for the broader southeast Texas region.
Rainfall and Flooding
Houston is one of the wettest major cities in the United States. The area averages about 104 rain days per year, with precipitation spread across every month. There’s no true dry season, though late summer and early fall tend to bring the heaviest individual downpours.
What sets Houston apart from other rainy cities is the intensity. Storms here don’t drizzle; they dump. The flat terrain, clay-heavy soils, and extensive pavement mean water has nowhere to go quickly. After NOAA updated its rainfall statistics following Hurricane Harvey (which dropped over 50 inches on the Houston area in 2017), the agency found that a storm previously classified as a 100-year event, around 13 inches of rain, is now closer to a 25-year event. The new 100-year rainfall estimate for the Houston area is 18 inches. Flash flooding is a regular part of life, not a freak occurrence. Major roadways and underpasses flood multiple times per year during heavy storms.
If you’re moving to Houston, understanding your property’s flood zone matters more than in most cities. Flooding has historically caused more damage and disruption than any other weather hazard in the region.
Hurricane Season
Atlantic hurricane season runs from June 1 through November 30, and Houston’s proximity to the Gulf Coast puts it squarely in the path of potential tropical systems. Not every season brings a direct hit, but the threat shapes life in the city for half the year. Tropical storms and hurricanes have passed within 75 miles of the Houston-Galveston area repeatedly since record-keeping began in 1886, with September being the peak month for activity.
The most significant recent impacts include Hurricane Harvey in 2017 and Hurricane Ike in 2008. Harvey was primarily a rain event that stalled over the city, while Ike brought destructive wind and storm surge. Both types of hurricane impact, wind and water, are realistic risks for the area.
Sunshine and Cloud Cover
Despite the rain, Houston gets a reasonable amount of sunshine. The city averages about 2,578 hours of sun per year, with the sunniest stretch running from May through September when days are longest. July alone averages nearly 294 hours of sunshine. Winter months are the cloudiest, with only about 44% to 47% of possible sunshine in December and January.
Across the full year, Houston receives about 58% of its possible sunshine. That puts it ahead of cities in the Pacific Northwest or Great Lakes region, but well behind the desert Southwest. On a typical Houston day, you can expect a mix of sun and clouds, with afternoon thunderstorms building on summer days and clearing by evening.
What the Climate Means Day to Day
Houston’s climate shapes daily routines in ways that might surprise newcomers. Air conditioning isn’t a luxury; it’s infrastructure. Cars, homes, offices, and even covered walkways between downtown buildings are climate-controlled. Outdoor activities shift to early morning or evening for roughly five months of the year. Mosquitoes thrive in the warm, wet conditions and are a year-round presence. Mold grows aggressively in the humidity, making home maintenance and indoor air quality ongoing concerns.
Clothing choices lean light from April through October. You’ll use a heavy coat perhaps a dozen times per year. Conversely, you’ll want rain gear accessible at all times. Checking the weather radar before driving across town becomes second nature, because a perfectly sunny morning can turn into a flooded afternoon in under an hour.