Month-by-month travel weather
San Antonio September weather
San Antonio, United States · September
Some years see heavier early-fall rain events
Heat can linger, while rain events can vary. Keep plans flexible if forecasts shift.
September averages at a glance
Average low
around 21–23°C
Average high
around 33–35°C
Average precipitation
around 70–120 mm
Precip days
about 5–8 days
What to wear in September in San Antonio
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Light clothing
- • Optional rain option
Travel tips for visiting San Antonio in September
- • If heavy rain is forecast, split errands and walks into shorter hops.
September weather in San Antonio — FAQ
Q. Does September cool down?
A. Gradually, but it can still feel very warm.
Explore San Antonio
These pages are connected so you can compare conditions and decide for yourself.