Weather in San Antonio in August 2025
- August is usually the hottest month of the year in San Antonio;
- August is usually the driest month of the year in San Antonio
Average weather
Average temperature in San Antonio in August
Going from a maximum of +41°C during the day to a minimum of +24°C during the night, the temperature in August averages around +40°C.
The average maximum temperature goes down 6% by the end of the month, compared with the beginning of the month, from +39°C to +38°C.
Is San Antonio warm or cold in August?
San Antonio is typically hot in August.
Maximum temperatures go up compared to the previous month from +35°C to +36°C. The minimum temperature also goes up from +24°C to +24°C.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
August is the hottest month in San Antonio, here is the comparison with other months:
Climate in San Antonio in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +35°C | +36°C | +33°C | ||||
| Min. temperature | ||||||
| +17°C | +18°C | +9°C | ||||
| Max. temperature | ||||||
| +42°C | +43°C | +43°C | ||||
| Rainfall | ||||||
| 65 mm | 55 mm | 91 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 68% | 65% | 68% | ||||
| Air pressure | ||||||
| 1014 HPa | 1013 HPa | 1013 HPa | ||||
| Sunny days | ||||||
| 9 | 10 | 10 | ||||
| Cloudy days | ||||||
| 8 | 8 | 5 | ||||
| Rainy days | ||||||
| 12 | 12 | 13 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as ok as in July. It’s getting warmer as August arrives. The average maximum temperature goes up from +35°C to +36°C during the day. As August arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 65 mm to 55 mm. It feels drier, as humidity decreases from 68% to 65%. The average wind speed doesn’t change much during August, staying around 3 m/s. The good news is there are likely to be more sunny days in August, from 9 to 10.
But maybe it is worth considering traveling in September as the weather gets better.
Wind
The average wind speed is 4 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in San Antonio is gradually decreasing during August, going from 4 m/s to 2 m/s over the course of the month.
Rain
How was the weather last August in San Antonio?
Climate Change over Years
The climate in San Antonio in August has not changed much over the last 43 years.
The average temperature was the lowest in 1983 (+25°C) and the highest in 2006 (+30°C). The driest year was 1996 with only 401 mm of rainfall, and the wettest year was 2007 with 1606 mm.
FAQ
Is August a good time to visit San Antonio?
Can you sunbathe in San Antonio in August?
Is San Antonio rainy in August?
Is it sunny in San Antonio in August?
Other cities in USA
Monthly weather in San Antonio
Source of the data
For this page, we’ve looked at the typical weather in San Antonio, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.