‹ San Antonio weather by month
Typical September weather
San Antonio
Texas · September
90° days
70° nights
about 5 rainy days · 12½ hours of daylight
What to pack
- Swimsuit
- Sunscreen
What September feels like
The rain returns and takes the edge off, and the first weak front usually sneaks in near the end of the month. Diez y Seis fills the plazas mid-month, and outdoor events here are still firmly evening events.
Expect about 5 days with real rain — enough to notice, not enough to plan around. It’s sticky — light fabrics and an afternoon break earn their keep. about 20 afternoons top 90°.
The numbers
| Typical high | 90° |
|---|---|
| Typical low | 70° |
| Days with real rain | 5 |
| Total rain | 3.9 in |
| Humidity | sticky |
| Sunrise / sunset (mid-month) | 7:18 am / 7:39 pm |