San Antonio, TX Weather Forecast & Climate Guide
San Antonio has a humid subtropical climate with hot summers and mild winters. Located in south-central Texas, the city experiences warm weather year-round with moderate to high humidity.
Climate type: Humid subtropical (Köppen Cfa)
San Antonio Climate Overview
Summer temperatures regularly reach the 90s-100s°F (32-38°C) with moderate humidity. Winters are mild with highs typically in the 60s°F (15°C) and lows rarely dropping below freezing. Annual precipitation is about 30 inches.
San Antonio's weather features long, hot summers and short, mild winters. The city occasionally experiences severe thunderstorms and is within range of Gulf hurricanes. Spring brings variable weather with tornado potential.
San Antonio Weather by Season
spring
Spring is beautiful and fleeting — March and April bring wildflower blooms (especially bluebonnets) and mild 70s-80s°F days. By May the heat is already cranking up.
summer
Summers are long and intense with highs consistently in the mid-90s°F and occasional triple-digit days. The heat is less humid than Houston but still draining by afternoon.
fall
Fall weather finally arrives in late October, dropping temperatures into the 80s°F. November is mild, pleasant, and one of the best times for outdoor activities along the River Walk.
winter
Winters are short and mild with highs in the 60s°F and occasional cold fronts. Hard freezes happen once or twice per year when Arctic air pushes south.
San Antonio Average Monthly Temperatures
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 63° | 67° | 74° | 81° | 87° | 93° | 96° | 96° | 91° | 82° | 72° | 64° |
| Low °F | 41° | 44° | 51° | 59° | 67° | 73° | 75° | 75° | 70° | 61° | 51° | 43° |
Best Time to Visit San Antonio
Mid-October through April. Mild temperatures, low rain chances, and comfortable humidity make this the prime time for Fiesta, the River Walk, and outdoor exploration.
Severe Weather Risks
- Severe thunderstorms
- Hail
- Flash flooding
- Heat waves
- Drought
Weather Facts About San Antonio
- >San Antonio sits on the edge of "Flash Flood Alley" — a narrow corridor prone to explosive rainfall events.
- >The Fiesta celebration in late April coincides with the last comfortable weather before summer heat.
- >Texas Hill Country to the north creates upslope enhancement during storms, boosting rainfall totals.
San Antonio Weather FAQ
When is the best time to visit San Antonio?
Late October through April delivers San Antonio's best weather — highs in the 60s-80s°F, low humidity, and minimal storm risk. April brings wildflowers and Fiesta season.
How hot are San Antonio summers?
Very hot. June through September averages highs in the mid-90s°F with occasional triple-digit days. It's drier than Houston but still draining.
Does San Antonio flood?
Yes — the area is part of "Flash Flood Alley." Heavy rainfall from tropical systems or severe thunderstorms can cause rapid flooding, especially in low-water crossings and creeks.
Does it ever snow in San Antonio?
Very rarely. A dusting of snow occurs maybe once every 5-10 years, and accumulating snow is a once-a-generation event. February 2021 was a notable exception when a hard freeze brought several inches.