San Antonio weather in August
Temperature, rain and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Fair
Best time to visit: October – April
What is the weather like in San Antonio in August?
In August, San Antonio is very hot: daytime highs average 35 °C, and even at night it stays warm at around 25 °C. The sun shines for around 9 hours a day. Rain falls on about 6 days, adding up to 48 mm. On about 30 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is a so-so month for a holiday in San Antonio.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 46 | 45 | 55 |
| Day | 35° | 35° | 32° |
| Night | 24° | 25° | 22° |
| Sun | 9 h | 9 h | 7 h |
| Rain days | 7 | 6 | 7 |
More details for August
- Daylight
- 13 h 14 min07:02 – 20:16
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 28 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 44 %on averageAll months
- Hot days
- 30 days30 °C or moreAll months
- Time zone
- UTC−5America/Chicago
How the score comes together
- Temperatureweight 50 %0 %
- Sunshineweight 20 %95 %
- Few rainy daysweight 30 %87 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
San Antonio in August: quick answers
Is San Antonio hot in August?
Yes. In August, San Antonio is very hot: daytime highs average 35 °C and nights stay around 25 °C. On about 30 days the thermometer climbs to 30 °C or more.
Does it rain much in San Antonio in August?
Rain falls on about 6 days, adding up to 48 mm.
San Antonio month by month
The whole year in San AntonioAll destinations: USAWhere to go in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences