Weather in San Antonio
Live weather and 7-day forecast for San Antonio, United States, followed by what to expect in each month of the year.
Sunrise 07:41 Sunset 18:58 Daylight 11h 17m Sun times →
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7-day forecast
Forecast data from Open-Meteo
Climate in San Antonio: month by month
Averaged over 2023–2025, the warmest month in San Antonio is August, with highs around 37 °C (99 °F) and lows around 26 °C (78 °F); the coolest is January, with highs around 18 °C (64 °F) and lows around 7 °C (44 °F).
San Antonio gets about 920 mm (36 in) of precipitation a year. The wettest month is May (198 mm over about 15 days) and the driest is August (21 mm).
| Month | Avg high | Avg low | Precipitation (in) | Wet days | Daylight |
|---|---|---|---|---|---|
| January | 64° | 44° | 2.5 | 9 | 10h 28m |
| February | 71° | 49° | 2.0 | 5 | 11h 10m |
| March | 80° | 58° | 2.8 | 10 | 11h 58m |
| April | 83° | 63° | 4.1 | 12 | 12h 53m |
| May | 88° | 70° | 7.8 | 15 | 13h 37m |
| June | 96° | 75° | 3.7 | 10 | 14h 1m |
| July | 95° | 76° | 4.1 | 11 | 13h 51m |
| August | 99° | 78° | 0.8 | 5 | 13h 13m |
| September | 94° | 74° | 1.5 | 5 | 12h 21m |
| October | 87° | 66° | 3.3 | 6 | 11h 29m |
| November | 75° | 56° | 2.0 | 9 | 10h 41m |
| December | 69° | 50° | 1.6 | 6 | 10h 16m |
Averages of daily values from the ERA5 reanalysis for 2023–2025 at San Antonio's coordinates (model elevation 203 m), via Open-Meteo (CC BY 4.0). Three recent years are not a 30-year climate normal; reanalysis smooths local extremes and tends to count more light-rain days than a rain gauge would. Daylight is sunrise to sunset on the 15th of each month.
Weather questions for San Antonio
What is the hottest month in San Antonio?
August, with average highs of 37 °C (99 °F) and lows of 26 °C (78 °F) over 2023–2025. The coolest month is January, averaging 18 °C (64 °F) by day and 7 °C (44 °F) at night.
What is the rainiest month in San Antonio?
May, with about 198 mm of precipitation on roughly 15 days. The driest month is August (21 mm), and the yearly total is around 920 mm.
When is the weather mildest in San Antonio?
Going by the averages, February–March and November–December are the months with average daytime highs between 18 °C and 27 °C (64–81 °F) — warm but not hot. May is the month most likely to bring rain.
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About this forecast
The live forecast comes from Open-Meteo, which blends models from national weather services and is fetched fresh in your browser on each visit. Times in the hourly outlook are San Antonio local time (America/Chicago).