San Antonio weather in September
Long-run climate averages for San Antonio, TX in September, plus what the forecast models say for the days ahead.
In September, San Antonio averages 94°F by day and 75°F at night. The wettest month is usually May.
September in San Antonio averages a daytime high of 94°F and an overnight low of 75°F, which reads as hot for this part of the world. 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.