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Climate · Houston

Houston in September

Hot and damp, as the days shorten.

Typical weather, averaged over 30 years

September in Houston is hot: highs near 92°F, lows near 73°F. Rain falls on about three days a week, less often as the month goes on, and the days shorten by 39 minutes from the first week to the last.September in Houston is hot: highs near 33°C, lows near 23°C. Rain falls on about three days a week, less often as the month goes on, and the days shorten by 39 minutes from the first week to the last.

High
92°F33°Caverage
Low
73°F23°Caverage
Wet days
3a week · 43% of days
Daylight
12h 17mon average

Is September a good time to visit Houston?

September sits outside Houston's best months, which run in two parts: March to April, or November. Expect hot days and rain on about three days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 92°F in September, against 66°F to 96°F through the year.Highs near 33°C in September, against 19°C to 36°C through the year.

Chance of a wet day

43% of days in September, against 31% to 46% through the year.

Cloud cover

42% cover in September, against 32% to 52% through the year.

Daylight

12h 17m in September, against 10h 16m to 14h 01m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August96°36°low 77°low 25°3 wet days a weekRain on about three days a week.
  2. September92°33°low 73°low 23°3 wet days a weekRain on about three days a week.
  3. October85°29°low 65°low 18°2 wet days a weekRain on about two days a week.

Where Houston sits, in September

America/Chicago
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
7:05 AMsets 7:28 PM
Above the sea
10 mlow-lying
Latitude
29.8°Nnorthern hemisphere
Nearest of ours
San Antonio322 km west

The land around Houston, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in September

high · low · wet days
See September on the planning mapThe whole year in Houston

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Houston. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.