San Antonio Weather in September

Average temperatures, rainfall and packing tips for San Antonio, United States in September

🌡️ Avg high
33°C
🌙 Avg low
23°C
🌧️ Rainfall
~47 mm
📊 Warmth rank
#4 of 12

September in San Antonio at a glance

September in San Antonio is typically very hot, with average daytime highs around 33°C and nights near 23°C. Temperature-wise it sits mid-range for San Antonio (the 4th warmest month).

Expect some rain: around 47 mm falls in San Antonio during September on average.

What to pack for San Antonio in September

San Antonio - year at a glance

HighLow · September highlighted
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Is September a good time to visit San Antonio?

🧳 September is seriously hot in San Antonio. It's still doable - plan outdoor activities for early morning or evening, and build in shade and hydration breaks around midday.

If your dates are flexible, the most comfortable months in San Antonio are usually February, March, April, November and December.

Other months in San Antonio

September in other cities

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FAQ

How hot is San Antonio in September?

In September, San Antonio averages a daytime high of about 33°C and a night-time low of around 23°C, based on recent historical data.

Does it rain in San Antonio in September?

Expect some rain: around 47 mm falls in San Antonio during September on average.

Is September a good time to visit San Antonio?

September is seriously hot in San Antonio. It's still doable - plan outdoor activities for early morning or evening, and build in shade and hydration breaks around midday. If your dates are flexible, the most comfortable months in San Antonio are usually February, March, April, November and December.