San Antonio weather in September
September in San Antonio averages 90°F by day and 70°F at night, with 3.9 inches of precipitation. It is the 4th-warmest and 2nd-wettest month of the year here.
- Average high
- 90°F-6° vs August
- Average low
- 70°F0 nights below freezing
- Precipitation
- 3.9 in5 days with 0.1 in. or more
- Snow
- 0.0 in20 days at 90°F+
Is September a good time to visit San Antonio?
September is hot. Average highs reach 90°F, with about 20 days at 90°F or more. The most comfortable months overall are February to April and October to December.
What to do in San Antonio in September
Mix it up: Six Flags Fiesta Texas, San Antonio Museum of Art, McNay Art Museum, Majestic Theatre. All things to do in San Antonio.
On September 15 the sun rises at 7:18 am and sets at 7:38 pm, giving 12h 20m of daylight. Daylight all year.
What to pack for San Antonio in September
- Light, breathable clothes, a hat and sunscreen; carry water
- An umbrella or rain jacket
Based on 30-year averages, not a forecast. Check the forecast a few days before you go.
September nearby
| City | Distance | High | Low | Precip. |
|---|---|---|---|---|
| San Antonio | 90°F | 70°F | 3.9 in | |
| New Braunfels, TX | 28 mi | 92°F | 68°F | 3.5 in |
| San Marcos, TX | 53 mi | 91°F | 67°F | 3.0 in |
| Austin, TX | 74 mi | 91°F | 70°F | 3.5 in |
| Cedar Park, TX | 83 mi | 91°F | 70°F | 3.5 in |
| Leander, TX | 87 mi | 91°F | 70°F | 3.5 in |
| Georgetown, TX | 95 mi | 90°F | 67°F | 4.0 in |
Frequently asked questions
What is the weather like in San Antonio in September?
In September, San Antonio averages a high of 90°F and a low of 70°F, with 3.9 inches of precipitation (NOAA 1991-2020 normals).
Is September a good time to visit San Antonio?
September is hot in San Antonio, with average highs of 90°F. Plan outdoor time for mornings and evenings.
Does it snow in San Antonio in September?
Rarely. The September snowfall normal is under half an inch.
Before and after: San Antonio in August and San Antonio in October. All twelve months: San Antonio weather by month.
NOAA NCEI 1991-2020 climate normals, station San Antonio Intl. Airport, TX, 7.5 miles from the city center.