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Climate · San Antonio

San Antonio in September

Hot and damp, as the days shorten.

Typical weather, averaged over 30 years

September in San Antonio is hot: highs near 93°F, lows near 72°F. Rain falls on about two days a week, less often as the month goes on, and the days shorten by 38 minutes from the first week to the last.September in San Antonio is hot: highs near 34°C, lows near 22°C. Rain falls on about two days a week, less often as the month goes on, and the days shorten by 38 minutes from the first week to the last.

High
93°F34°Caverage
Low
72°F22°Caverage
Wet days
2a week · 31% of days
Daylight
12h 17mon average

Is September a good time to visit San Antonio?

September sits outside San Antonio's best months, which run in two parts: March, or November. Expect hot days and rain on about two 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 93°F in September, against 66°F to 99°F through the year.Highs near 34°C in September, against 19°C to 37°C through the year.

Chance of a wet day

31% of days in September, against 22% to 40% through the year.

Cloud cover

40% cover in September, against 31% to 50% through the year.

Daylight

12h 17m in September, against 10h 17m to 14h 00m 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. August99°37°low 76°low 24°2 wet days a weekRain on about two days a week.
  2. September93°34°low 72°low 22°2 wet days a weekRain on about two days a week.
  3. October86°30°low 65°low 18°2 wet days a weekRain on about two days a week.

Where San Antonio sits, in September

America/Chicago
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
7:19 AMsets 7:41 PM
Above the sea
250 mlow-lying
Latitude
29.5°Nnorthern hemisphere
Nearest of ours
Houston322 km east

The land around San Antonio, 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 San Antonio

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest San Antonio. 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.