Houston Weather in September

What's the weather like in Houston (Texas) in September 2025?

The climate in Houston during September can be summarized as hot, humid and wet.

September is in the fall / autumn in Houston and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 30°C (86°F), whilst at night 21°C (70°F) is normal.

Houston weather averages (imperial / metric)
Daytime temperature 30.1°C 86.1°F
Nightly temperature 21.4°C 70.4°F
Average temperature 25.7°C 78.3°F
Daily sunshine 8.4 hrs
Avg rainfall 123 mm 4.8 ins
Rainy days 9 days
Sea temperature 28.8°C 83.8°F
Humidity 77%
Windspeed 13kph 8 mph

On average September is the 2nd wettest month of the year in Houston with around 123mm 4.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.4 hours of sunshine per day.

September temperatures in Houston

Houston average temperature in September

September rainfall

Houston average rain in September

September hourly sunshine

Houston average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Houston in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Houston weather stats

Houston weather statistics
Hottest month: July 32.5°C 90.5°F
Driest month: March 66mm 2.6ins
Sunniest month: July 10.3hrs
Coldest month: January 15.2°C 59.4°F
Wettest month: June 132mm 5.2ins
Map showing location of Houston (29.76328, -95.36327) Houston map pin © Google

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