San Antonio weather in August
Long-run climate averages for San Antonio, TX in August, plus what the forecast models say for the days ahead.
In August, San Antonio averages 100°F by day and 79°F at night. The wettest month is usually May.
August in San Antonio averages a daytime high of 100°F and an overnight low of 79°F, which reads as hot for this part of the world. It is the warmest month of the year here. Across the whole year San Antonio sees roughly 36 inches of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like - for that, see the live San Antonio forecast with every model compared and how much they currently agree.
San Antonio weather by month
what to expect in San Antonio through the yearHere is San Antonio's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to San Antonio by season.
Bottom line: over the last 30 days the European model has been the most accurate forecast for San Antonio, scoring 92/100 on our CheckWeather Score, ahead of the American at 79. See the full US accuracy scoreboard for exactly how every model is tested.
Common questions
How warm is San Antonio in August?
Is August a good time to visit San Antonio?
Does it rain a lot in San Antonio in August?
Climate averages from ERA5 reanalysis. Model accuracy re-scored over a rolling 30 days. Page updated .