Weather in San Antonio in September
In an average September, San Antonio sees a daily high around 90°F and a low around 71°F, based on 1980–2026 of local climate records.
| Average high | 90°F |
|---|---|
| Typical high range | 83°F to 96°F |
| Average low | 71°F |
| Typical low range | 65°F to 75°F |
| Average daily precipitation | 0.10 in |
September records
The most extreme September on record for each metric, across 1980–2026. For rainfall, the wettest and driest are by total September accumulation.
High
Highest
108°F
2000-09-05
Lowest
63°F
1984-09-29
Low
Highest
81°F
2020-09-01
Lowest
47°F
1981-09-19
Feels-like
Highest
142°F
2019-09-18
Lowest
45°F
1983-09-22
Humidity
Highest
23.8 g/m³
2018-09-21
Lowest
5.0 g/m³
2011-09-06
Wind
Highest
24 mph
1998-09-11
Lowest
4 mph
2016-09-28
Gust
Highest
51 mph
1998-09-11
Lowest
9 mph
2010-09-29
Precip
Wettest
12.63 in
2018
Driest
0.15 in
2008
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