Will it rain in
San Antonio today?
Live hourly rain forecast and run verdict for San Antonio, Texas, US.
Running in San Antonio means coping with south Texas heat and surprise thunderstorms rolling up from the Gulf. Whether it's a humid morning along the River Walk, a sudden afternoon downpour, or a scorching summer day pushing you to run at dawn, knowing whether to head out before you lace up matters. RainOrRun checks live conditions in San Antonio right now and gives you an instant verdict — plus the best hourly window if the weather's on the fence. We'll also recommend the right gear for whatever San Antonio's Texan heat is throwing at you today.
What to wear
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How often does it rain in San Antonio?
San Antonio records around 993mm of rain a year, spread across about 114 days — roughly 31% of all days, or 10 days in an average month. That puts San Antonio mid-pack: rain interrupts roughly one run in three, so it pays to check the hourly forecast before a long run, but you will not be running in waterproofs week after week.
The wettest month is May, averaging 172mm across about 16 rainy days. The driest is February, with 54mm over roughly 8 days. Average lows bottom out around 6.6°C in January — long-sleeve and light-glove weather rather than full winter kit. At the other end, August averages 35.5°C highs — hot enough that early morning and evening are the sensible windows, and hydration matters more than waterproofing.
Those are ten-year averages, not a forecast. What actually matters on the day is the next twelve hours — which is what the live verdict and hourly strip at the top of this page are for.
| Month | Rainfall | Rainy days | Avg high | Avg low |
|---|---|---|---|---|
| January | 55mm | 8 | 17.3°C | 6.6°C |
| February | 54mm | 8 | 19.7°C | 8.4°C |
| March | 64mm | 10 | 24.2°C | 13.2°C |
| April | 103mm | 12 | 27.2°C | 16.3°C |
| May | 172mm | 16 | 30.2°C | 20.3°C |
| June | 73mm | 11 | 33.7°C | 23.4°C |
| July | 65mm | 7 | 35.4°C | 24.6°C |
| August | 80mm | 7 | 35.5°C | 25°C |
| September | 101mm | 10 | 32.6°C | 22.8°C |
| October | 97mm | 8 | 28.3°C | 17.8°C |
| November | 70mm | 9 | 21.9°C | 12.3°C |
| December | 59mm | 8 | 19.1°C | 9°C |
Historical data: Open-Meteo archive, 2015–2024. A “rainy day” means at least 1mm of precipitation.
Running in San Antonio: common questions
Will it rain in San Antonio today?
The forecast card at the top of this page shows San Antonio's rain probability for the current hour, plus an hour-by-hour breakdown for the rest of the day, using live Open-Meteo data. Historically, San Antonio sees rain on about 114 days a year, so on any given day there is roughly a 31% chance of some rain falling.
Is it a good day to run in San Antonio?
RainOrRun scores the live San Antonio forecast on rain probability, rainfall amount, temperature, wind speed and severe weather, then returns a single verdict: Go, Maybe, or Don't Bother. A Maybe means conditions are borderline and it is worth picking your window rather than skipping the run.
What is the best time to run in San Antonio today?
The hourly strip above highlights the best single window of the day for San Antonio — the hour combining the lowest rain probability with the most comfortable temperature. You can also check up to eight days ahead using the date picker if you are planning a long run or a race.
What should I wear running in San Antonio today?
The gear section on this page updates with the live San Antonio forecast: a waterproof jacket and peaked cap when rain probability goes above 40%, a thermal base layer and gloves below 8 degrees Celsius, and a high-vis vest when wind or low light make you harder to see.
What is the wettest month in San Antonio?
May is the wettest month in San Antonio, averaging 172mm of rain across about 16 rainy days. February is the driest, with around 54mm over roughly 8 days. Figures are ten-year averages covering 2015 to 2024.
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