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Climate · San Antonio

San Antonio in August

Very hot and mostly dry, as the days shorten.

Typical weather, averaged over 30 years

August in San Antonio is very hot: highs near 99°F, lows near 76°F. Rain falls on about two days a week, more often as the month goes on, and the days shorten by 45 minutes from the first week to the last.August in San Antonio is very hot: highs near 37°C, lows near 24°C. Rain falls on about two days a week, more often as the month goes on, and the days shorten by 45 minutes from the first week to the last.

High
99°F37°Caverage
Low
76°F24°Caverage
Wet days
2a week · 22% of days
Daylight
13h 10mon average

Is August a good time to visit San Antonio?

August sits outside San Antonio's best months, which run in two parts: March, or November. Expect very 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 August sits in the year

week by week

Temperature

Highs near 99°F in August, against 66°F to 99°F through the year.Highs near 37°C in August, against 19°C to 37°C through the year.

Chance of a wet day

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

Cloud cover

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

Daylight

13h 10m in August, against 10h 17m to 14h 00m through the year.

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

Either side

  1. July97°36°low 75°low 24°2 wet days a weekRain on about two days a week.
  2. August99°37°low 76°low 24°2 wet days a weekRain on about two days a week.
  3. September93°34°low 72°low 22°2 wet days a weekRain on about two days a week.

Where San Antonio sits, in August

America/Chicago
this place
typical high in August 40°F4°C95°F35°C
Sunrise, mid-August
7:02 AMsets 8:17 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 August, 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 August

high · low · wet days
See August 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.