San Antonio, Texas, features a humid subtropical climate with long, hot, and humid summers and short, mild winters. The city enjoys over 250 days of sunshine annually, with rainfall spread throughout the year. Seasonal changes are pronounced, making San Antonio a dynamic destination for outdoor activities, festivals, and exploring its vibrant cultural attractions.
The best times to travel section shows how the months compare for a visit, so you can find the time of year that fits what you want to do.
Background colours of the months:
The colour shows the typical temperature: yellow (hot), green (mild) and blue (cold). How strong the colour is shows the travel season: full colour means high season, soft colour means shoulder season and soft-striped means off season.
Weather symbols:
Each month has one symbol showing what the weather is typically like, such as hot and sunny, freezing or a rainy or snowy season. Use them to quickly spot months that match the weather you want, or to avoid the ones that don't.
Crowdedness:
The people icon shows how busy the place usually is. The more people, the more crowded it gets.
Additional notes:
The grey info boxes point out special things worth knowing, like recurring weather issues or seasonal events.
San Antonio’s climate is shaped by its inland location in southern Texas, about 200 km from the Gulf of Mexico. Summers (June–September) are very hot and humid, with average highs of 34–36°C and frequent peaks above 38°C. Nights remain warm, typically 22–25°C. Humidity is high, and the heat can be oppressive, especially in July and August. Rainfall is steady year-round, but May and June are the wettest months, often bringing heavy downpours and thunderstorms. Sunshine is abundant, with up to 10 hours per day in midsummer.
Winters (December–February) are short and mild, with average highs of 17–19°C and lows of 5–8°C. Freezing temperatures and snow are rare but possible, usually only for a few days each year. Spring (March–May) and autumn (October–November) are the most pleasant seasons, with comfortable temperatures (21–28°C), moderate humidity, and blooming wildflowers in spring. Rainfall is moderate in these transitional seasons, and days are often sunny and breezy. San Antonio receives about 820 mm of rain annually and enjoys around 2,600–2,700 hours of sunshine per year. Winds are generally light to moderate (13–15 km/h), and the city can occasionally be affected by remnants of hurricanes or tropical storms, mainly bringing rain rather than severe winds. The UV index is high in summer, so sun protection is essential. Daylight ranges from 10 hours in winter to 14 hours in summer.
| Average climate data for San Antonio, United States | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average maximum temperature (°C) | 17 | 19 | 22 | 27 | 30 | 33 | 35 | 36 | 32 | 27 | 21 | 17 | 36 |
| Average minimum temperature (°C) | 7 | 9 | 12 | 16 | 20 | 23 | 24 | 24 | 22 | 17 | 12 | 8 | 7 |
| Average precipitation (mm) | 29 | 25 | 38 | 47 | 93 | 53 | 41 | 38 | 85 | 68 | 27 | 28 | 573 |
| Average rainfall days (days) | 9 | 11 | 14 | 15 | 16 | 13 | 10 | 10 | 17 | 10 | 9 | 10 | 144 |
| Average snowfall (mm) | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 5 |
| Average snowfall days (days) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Average relative humidity (%) | 64 | 69 | 70 | 71 | 73 | 70 | 64 | 58 | 65 | 65 | 68 | 68 | 67 |
| Average wind speed (km/h) | 13 | 14 | 14 | 14 | 15 | 13 | 12 | 11 | 10 | 12 | 12 | 13 | 13 |
| Average daily daylight hours (h) | 10 | 11 | 12 | 12 | 13 | 14 | 13 | 13 | 12 | 11 | 10 | 10 | 12 |
| Average daily sunshine hours (h) | 6 | 6 | 6 | 7 | 8 | 9 | 10 | 9 | 8 | 7 | 5 | 5 | 7 |
| Average cloud coverage (%) | 37 | 42 | 47 | 44 | 46 | 38 | 27 | 22 | 32 | 32 | 39 | 40 | 37 |
| Average UV index | 4 | 4 | 5 | 6 | 6 | 7 | 7 | 7 | 6 | 5 | 4 | 3 | 5 |
The best time to visit San Antonio is from November to April, when temperatures are mild (17–28°C), humidity is lower, and rainfall is moderate. Spring and autumn offer the most comfortable weather for exploring outdoor attractions like the River Walk, Alamo, and city parks, with blooming wildflowers and lively festivals.
The least favourable time is from June to early September, when San Antonio experiences its hottest and most humid weather. Daytime highs often exceed 35°C, humidity is high, and heavy rain or thunderstorms are common, making outdoor activities uncomfortable and increasing the risk of heat-related illnesses.
San Antonio has a humid subtropical climate with long, hot, humid summers and short, mild winters. Rain falls throughout the year, with May and June being the wettest months. Sunshine is abundant, especially in summer.
The best time to visit is from November to April, when temperatures are mild, humidity is lower, and rainfall is moderate. Spring and autumn are especially pleasant for outdoor activities and sightseeing.
Snow is rare in San Antonio, but light flurries or a brief accumulation can occur every few years, usually between December and February. Most winters are frost-free and mild.
Summer temperatures in San Antonio often reach 34–36°C, with peaks above 38°C during heatwaves. Humidity is high, making the heat feel even more intense. Sun protection and hydration are essential.
San Antonio receives about 820 mm of rain annually, with the heaviest rainfall in May and June. Thunderstorms are common in late spring and summer, but rain can occur in any month.
Yes, San Antonio enjoys over 250 days of sunshine per year and around 2,600–2,700 hours of sun annually. Summer months are especially bright, with up to 10 hours of sunshine per day.
The warmest month, with the highest average maximum temperature, is August (35.8 °C). The month with the lowest average maximum temperature is January (16.6 °C). Overall, the average maximum temperature over the whole year is 26.3 °C.
The month with the highest average minimum temperature is August (24.3 °C). The coldest month, with the lowest average minimum temperature, is January (6.9 °C). Overall, the average minimum temperature over the whole year is 16.1 °C.
The wettest month, with the highest amount of precipitation, is May (93.2 mm). The driest month, with the least amount of precipitation, is February (25.3 mm). Over the whole year there are 572.8 mm of rainfall on average.
The month with the most days of rain is September (16.9 days). The month with the fewest days of rain is January (9.1 days). Over the whole year there are 144.3 days of rain on average.
The month with the most snowfall is February (2 mm). The months with the least snowfall are March, April, May, June, July, August, September, October and November (0 mm). Over the whole year there are 5 mm of snowfall on average.
The month with the most days of snowfall is January (0.3 days). The months with the fewest days of snowfall are March, July and August (0 days). Over the whole year there are 1.2 days of snowfall on average.
The month with the highest average relative humidity is May (72.8 %). The month with the lowest average relative humidity is August (58.2 %). The overall average relative humidity over the whole year is 67.2 %.
The windiest month, with the highest average wind speed, is May (14.6 km/h). The calmest month, with the lowest average wind speed, is September (10.4 km/h). The overall average wind speed over the whole year is 12.7 km/h.
The month with the cloudiest skies, so the highest cloud coverage, is March (46.7 %). The month with the clearest skies, so the lowest cloud coverage, is August (21.9 %). Over the whole year there is an average cloud coverage of 37.1 %.
The month with the longest days, so the most daylight, is June (Average daylight: 14 h). The month with the shortest days, so the least daylight, is December (Average daylight: 10 h). Over the whole year there are 11.8 h of daylight per day on average.
The month with the most sunshine per day is July (Average sunshine: 10 h). The month with the least sunshine per day is December (Average sunshine: 4.9 h). Over the whole year there are 7.2 h of sunlight per day on average.
The months with the highest average UV index are June, July and August (UV index: 7). The month with the lowest average UV index is December (UV index: 3). Over the whole year the average UV index is 5.3.
