San Antonio Climate by Month
San Antonio, Texas, United States
Very hot summers and mild winters, with rain spread through the year.
The climate in San Antonio is one of very hot summers and mild winters, with rain spread through the year. August is the warmest month, with highs around 97°F (36°C); January is the coolest at 65°F (18°C), and nights dip to 42°F (6°C). It gets 31 in (790 mm) of rain a year, spread across the months.
- Warmest month
- 97°F(36°C)
- Average high, August
- Coldest nights
- 42°F(6°C)
- Average low, January
- Rain per year
- 31 in(790 mm)
- No clear rainy season
- Humidity
- 62%
- Sunniest: July
Best and worst months in San Antonio
Best for weatherMarch is the best time for weather in San Antonio: highs near 75°F (24°C) and about 1.7 in (44 mm) of rain a month.
Least pleasantJuly and August are the least pleasant; August is the hottest, with highs of 97°F (36°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in March.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Antonio weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 65°F(18°C) | 42°F(6°C) | 1.9 in(47 mm) | 58% | 2.8 |
| FebFebruary | 69°F(21°C) | 46°F(8°C) | 1.8 in(46 mm) | 62% | 3.2 |
| MarMarchBest | 75°F(24°C) | 53°F(11°C) | 1.7 in(44 mm) | 64% | 4.1 |
| AprApril | 82°F(28°C) | 59°F(15°C) | 2.4 in(61 mm) | 63% | 5.3 |
| MayMay | 88°F(31°C) | 67°F(20°C) | 3.5 in(90 mm) | 65% | 5.7 |
| JunJune | 94°F(34°C) | 73°F(23°C) | 3.5 in(89 mm) | 62% | 6.3 |
| JulJuly | 96°F(36°C) | 75°F(24°C) | 2.4 in(60 mm) | 60% | 6.6 |
| AugAugust | 97°F(36°C) | 75°F(24°C) | 2.5 in(64 mm) | 57% | 6.1 |
| SepSeptember | 91°F(33°C) | 69°F(21°C) | 3.5 in(90 mm) | 62% | 5.2 |
| OctOctober | 84°F(29°C) | 61°F(16°C) | 3.4 in(87 mm) | 63% | 4.1 |
| NovNovember | 73°F(23°C) | 51°F(11°C) | 2.4 in(62 mm) | 63% | 2.9 |
| DecDecember | 65°F(19°C) | 43°F(6°C) | 2.0 in(50 mm) | 63% | 2.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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