🤠 Houston Weather

Gulf heat and flooding rains

Houston's humid subtropical climate is shaped by its low, flat setting near the Gulf of Mexico. Warm, moisture-laden Gulf air gives the city long, intensely humid summers and the capacity for some of the heaviest rainfall events in the United States — the flat terrain and sprawling pavement leave little room for that water to go.

Hot, humid summers

From June through September, highs hold in the mid-90s°F (around 35°C), and relentless humidity pushes the heat index well past 105°F (41°C). The air is thick and still, broken by afternoon thunderstorms and the constant hum of air conditioning that makes summer life in Houston possible.

Catastrophic rain and hurricanes

Houston's gravest threat is flooding. Stalled tropical systems can unload staggering amounts of rain — Hurricane Harvey in 2017 dropped more than 50 inches (1,270 mm) on parts of the metro in a few days, a national record. The June-to-November hurricane season is watched with deep seriousness across the region.

The city averages about 50 inches (1,270 mm) of rain a year. Winters are mild and short, with highs in the low 60s°F (around 17°C); hard freezes are rare but, as the 2021 winter storm showed, can be devastating when they do strike.

Gulf humidity and flood country

Houston is famously humid — its low, flat setting near the Gulf keeps summer air thick and heat indices routinely past 105°F (41°C), with little overnight relief. The daily sea breeze fires afternoon thunderstorms that can dump intense, localized rain.

Flooding is the city's defining hazard. The flat terrain drains poorly, and slow-moving tropical systems can be catastrophic, as Hurricane Harvey's 2017 deluge of over 50 inches (1,270 mm) proved. Winters are short and mild, though the rare hard freeze — like the February 2021 event — can catch the region dangerously unprepared.