Year-round weather and climate in San Antonio, United States
Average temperatures in San Antonio run from an average low of 7°C45°F in January up to an average high of 38°C100°F in August. August is the driest month at 3 rainy days; May the wettest at 15. Here is the annual climate data, so you know what you are packing for.
Good to know
- Population
- 1.5M
- Currency
- USD
- Language
- English
- Time zone
- Chicago
Best time to visit
To avoid the most intense heat, the best time to visit is during the milder season around August, September, and October.
Rain character
Tropical Downpours: Expect intense bursts of rain during wetter months. Pack quick-drying footwear and a compact umbrella.
Day-to-night swing
The Daypack Trap: Beware the "noon illusion". In months like February, crisp sunny days drop off a cliff by 12°C22°F at sunset. Always carry an evening layer.
Seasonality Profile
Mediterranean: Hot, bone-dry summers giving way to mild, occasionally wet winters.
Evening vibe
Cozy Indoor Culture: Evenings are generally crisp, damp, or sweltering. Nightlife centers around indoor venues.
Sightseeing stamina
Summer Heat Fatigue: Midday heat in June, July, August, and September is intense. Pack high-SPF sunscreen and a wide-brimmed hat.
Average temperatures, sunshine, and rainfall
Average monthly weather in San Antonio, based on recent historical data. Essential insights on temperature swings, expected rainfall, and daily sunshine.
Bars span the average daily low to high. Aug is typically driest at 3 days (15mm); May the wettest at 15 days (201mm).
| Month | Average high | Average low | Sunshine hours | Rainy days | Total rainfall |
|---|---|---|---|---|---|
| Jan | 18°C / 64°F | 7°C / 44°F | 7h | 9 | 74mm |
| Feb | 21°C / 70°F | 10°C / 50°F | 8h | 6 | 55mm |
| Mar | 25°C / 77°F | 14°C / 57°F | 8h | 11 | 67mm |
| Apr | 27°C / 81°F | 17°C / 62°F | 9h | 14 | 120mm |
| May | 30°C / 87°F | 21°C / 69°F | 9h | 15 | 201mm |
| Jun | 36°C / 96°F | 24°C / 76°F | 12h | 10 | 75mm |
| Jul | 36°C / 97°F | 25°C / 77°F | 12h | 9 | 56mm |
| Aug | 38°C / 100°F | 26°C / 79°F | 12h | 3 | 15mm |
| Sep | 35°C / 94°F | 24°C / 75°F | 11h | 6 | 42mm |
| Oct | 30°C / 86°F | 19°C / 66°F | 9h | 7 | 98mm |
| Nov | 23°C / 73°F | 13°C / 55°F | 8h | 9 | 55mm |
| Dec | 20°C / 69°F | 10°C / 50°F | 7h | 9 | 48mm |
Weather data by Open-Meteo.com (opens in a new tab)
Frequently Asked Questions
When is the sunniest time of year to visit San Antonio?
The most sunshine in San Antonio comes around August, averaging 12 hours a month. If you're heading there then, pack your sunglasses and sunscreen.
What clothes should I pack for San Antonio?
Your packing list depends entirely on when you travel. Temperatures in San Antonio swing from an average low of 7°C45°F in January up to 38°C100°F in August. The Packola app builds a tailored packing list for you based on the live weather forecast for your exact travel dates.
Do I need to pack an umbrella for San Antonio?
San Antonio gets rain on about 108 days out of the year. The wettest month is May. If you're traveling during the rainy season, you'll definitely want to pack an umbrella and a light rain jacket.
Pack smarter.
Averages get you close, but the week you travel is what matters. Get the live forecast, a smart packing list, and discover the best local spots and activities in San Antonio with Packola.
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