San Antonio, TX Climate & Monthly Averages
The climate of San Antonio
Located in Texas, United States, San Antonio experiences a humid subtropical climate with hot, humid summers and generally mild winters. Afternoon temperatures peak near 96°F (36°C) in August and dip to about 63°F (17°C) in January, with around 39.1 inches (994 mm) of precipitation falling across the year.
Climate quick facts
- Hottest month: August - highs near 96°F (36°C)
- Coldest month: January - highs near 63°F (17°C)
- Record high: 107°F (42°C) · Record low: 8°F (-13°C) (2015–2024)
- Wettest month: May (16 rainy days) · Sunniest: July (12.0 h sun/day)
- Climate type: humid subtropical - hot, humid summers and generally mild winters
Temperatures through the year
The warmest stretch of the year centers on August. Highs average 96°F (36°C) and overnight lows stay near 77°F (25°C). The coolest month is January, with typical highs of 63°F (17°C) and lows around 44°F (7°C). Based on 2015–2024 weather data, temperatures have reached as high as 107°F (42°C) and dropped as low as 8°F (-13°C).
Rain, sun and snow
May is usually the wettest month. It brings about 6.8 inches (172 mm) of rain over 16 days, while February is the driest. July brings the most sunshine, averaging 12.0 hours of sun a day. Snowfall is rare but not unheard of.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 63° | 44° | 8 | 2.2 in | 7.4 h/day | 65% |
| February | 67° | 47° | 8 | 2.1 in | 7.0 h/day | 67% |
| March | 76° | 56° | 10 | 2.5 in | 7.8 h/day | 66% |
| April | 81° | 61° | 12 | 4.1 in | 8.8 h/day | 67% |
| May | 86° | 69° | 16 | 6.8 in | 9.6 h/day | 74% |
| June | 93° | 74° | 11 | 2.9 in | 11.6 h/day | 69% |
| July | 96° | 76° | 7 | 2.6 in | 12.0 h/day | 64% |
| August | 96° | 77° | 7 | 3.1 in | 11.6 h/day | 62% |
| September | 91° | 73° | 10 | 4.0 in | 10.3 h/day | 66% |
| October | 83° | 64° | 8 | 3.8 in | 9.2 h/day | 63% |
| November | 71° | 54° | 9 | 2.8 in | 7.0 h/day | 70% |
| December | 66° | 48° | 8 | 2.3 in | 6.7 h/day | 69% |
San Antonio month by month
San Antonio weather in January
January brings highs around 63°F (17°C), lows near 44°F (7°C), about 8 wet days - typically the coldest month of the year in San Antonio.
San Antonio weather in February
February brings highs around 67°F (20°C), lows near 47°F (8°C), about 8 wet days - typically the driest month of the year in San Antonio.
San Antonio weather in March
March brings highs around 76°F (24°C), lows near 56°F (13°C), about 10 wet days.
San Antonio weather in April
April brings highs around 81°F (27°C), lows near 61°F (16°C), about 12 wet days.
San Antonio weather in May
May brings highs around 86°F (30°C), lows near 69°F (20°C), about 16 wet days - typically the wettest month of the year in San Antonio.
San Antonio weather in June
June brings highs around 93°F (34°C), lows near 74°F (23°C), about 11 wet days.
San Antonio weather in July
July brings highs around 96°F (35°C), lows near 76°F (25°C), about 7 wet days - typically the sunniest month of the year in San Antonio.
San Antonio weather in August
August brings highs around 96°F (36°C), lows near 77°F (25°C), about 7 wet days - typically the hottest month of the year in San Antonio.
San Antonio weather in September
September brings highs around 91°F (33°C), lows near 73°F (23°C), about 10 wet days.
San Antonio weather in October
October brings highs around 83°F (28°C), lows near 64°F (18°C), about 8 wet days.
San Antonio weather in November
November brings highs around 71°F (22°C), lows near 54°F (12°C), about 9 wet days.
San Antonio weather in December
December brings highs around 66°F (19°C), lows near 48°F (9°C), about 8 wet days.
Seasons in San Antonio
Spring (March through May)
Spring in San Antonio runs hot, with daytime highs averaging 81°F (27°C) and nights around 62°F (17°C); expect showers on roughly 38 days across the season.
Summer (June through August)
Summer in San Antonio is intensely hot, with daytime highs averaging 95°F (35°C) and nights around 76°F (24°C); expect showers on roughly 25 days across the season.
Fall (September through November)
Fall in San Antonio runs hot, with daytime highs averaging 82°F (28°C) and nights around 64°F (18°C); expect showers on roughly 27 days across the season.
Winter (December through February)
Winter in San Antonio is mild, with daytime highs averaging 66°F (19°C) and nights around 46°F (8°C); expect showers on roughly 24 days across the season.
Climate questions, answered
What is the average temperature in San Antonio?
Is San Antonio hot in summer?
Is San Antonio cold in winter?
How many rainy days does San Antonio get in a year?
Best time to visit San Antonio
The best time to visit San Antonio is generally January to April and October to November, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window typically sit near 74°F (23°C).
Pack for San Antonio with lightweight, breathable clothing and strong sun protection for the hot months; a compact umbrella or rain shell - showers are a regular feature. Evenings can feel noticeably cooler than afternoons - August nights average 77°F (25°C).
San Antonio temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.