San Antonio Weather by Month
Twelve months of San Antonio, United States weather — averages from 2006–2025.
San Antonio's warmest month is August (average high 35.7°C (96.3°F)) and the coolest is January (17.1°C (62.8°F)). The most rain falls in May (about 137 mm), and December is the driest (about 49 mm). July is the sunniest, with about 11.9 hours of sunshine a day.
Best months to visit San Antonio
Ranked within San Antonio's own year by temperature comfort, rainy days and sunshine — historical averages, not a forecast.
San Antonio month by month
January
GoodHigh 17.1°C (62.8°F)
Low 6.5°C (43.7°F)
- Rainfall
- 58 mm (2.3 in)
- Rainy days
- 7 rainy days
- Sunshine
- 7.3 h sunshine / day
February
GreatHigh 19.6°C (67.3°F)
Low 8.4°C (47.1°F)
- Rainfall
- 50 mm (2 in)
- Rainy days
- 7 rainy days
- Sunshine
- 7.3 h sunshine / day
March
GreatHigh 24.1°C (75.4°F)
Low 12.8°C (55°F)
- Rainfall
- 69 mm (2.7 in)
- Rainy days
- 9 rainy days
- Sunshine
- 8.2 h sunshine / day
April
GoodHigh 27.4°C (81.3°F)
Low 16.3°C (61.3°F)
- Rainfall
- 84 mm (3.3 in)
- Rainy days
- 10 rainy days
- Sunshine
- 9.4 h sunshine / day
May
GoodHigh 30.5°C (86.9°F)
Low 20.1°C (68.2°F)
- Rainfall
- 137 mm (5.4 in)
- Rainy days
- 13 rainy days
- Sunshine
- 10.2 h sunshine / day
June
FairHigh 33.9°C (93°F)
Low 23.4°C (74.1°F)
- Rainfall
- 66 mm (2.6 in)
- Rainy days
- 9 rainy days
- Sunshine
- 11.8 h sunshine / day
July
FairHigh 34.8°C (94.6°F)
Low 24.3°C (75.7°F)
- Rainfall
- 71 mm (2.8 in)
- Rainy days
- 8 rainy days
- Sunshine
- 11.9 h sunshine / day
August
FairHigh 35.7°C (96.3°F)
Low 25.1°C (77.2°F)
- Rainfall
- 55 mm (2.1 in)
- Rainy days
- 6 rainy days
- Sunshine
- 11.9 h sunshine / day
September
FairHigh 32.2°C (90°F)
Low 22.5°C (72.5°F)
- Rainfall
- 87 mm (3.4 in)
- Rainy days
- 9 rainy days
- Sunshine
- 10.4 h sunshine / day
October
GoodHigh 28.2°C (82.8°F)
Low 17.7°C (63.9°F)
- Rainfall
- 75 mm (3 in)
- Rainy days
- 7 rainy days
- Sunshine
- 9.4 h sunshine / day
November
GreatHigh 22.1°C (71.8°F)
Low 12.2°C (54°F)
- Rainfall
- 56 mm (2.2 in)
- Rainy days
- 7 rainy days
- Sunshine
- 7.6 h sunshine / day
December
GreatHigh 18.5°C (65.3°F)
Low 8.5°C (47.3°F)
- Rainfall
- 49 mm (1.9 in)
- Rainy days
- 8 rainy days
- Sunshine
- 6.7 h sunshine / day
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Based on 20 years of historical weather data (2006–2025) from Open-Meteo. Monthly averages, not a forecast.