Is San Antonio hot in September?
Days are typically hot at 32.2°C, while nights average 20.5°C.
United States · 1991–2020 normal
San Antonio in
September.
Typical September weather in San Antonio: 32.2°C by day, 20.5°C at night, 110 mm of rain over 6.6 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high32.2°C
Typical low20.5°C
Rain110 mm
Wet days6.6
In the year-round weather comparison, September scores 49 out of 100 (April leads the year at 86). Daylight is calculated as 12 h 18 from latitude 29.42°.
September at a glance
What is San Antonio like in September?
Plain answers from the measured climate record—not a forecast or a promise about a particular trip.
Does it rain much?
The measured monthly average is 110 mm across about 7 wet days.
How much daylight is there?
There are about 12 h 18 between sunrise and sunset at mid-month, calculated from the place latitude.
Is September a good time to visit?
September ranks 9 of 12 in our weather comparison; April ranks first.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 4726206
- NOAA station
- USC00417947 · SAN ANTONIO INCARNATE WORD
- Station distance
- 5.5 km from the place centre
- Coverage
- Good coverage · 20 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for San Antonio is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
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