San Antonio Weather Forecast: Heavy Rain and Thunderstorms Expected Sunday
San Antonio residents should keep their umbrellas handy as a wet weather pattern moves into the region. While the city is currently seeing overcast skies and warm temperatures, a significant increase in precipitation is expected over the next 48 hours, with Sunday bringing the highest risk of thunderstorms.
Current Conditions and Immediate Outlook
As of Saturday afternoon, April 11, 2026, conditions at the San Antonio International Airport are overcast with a temperature of 80°F. Winds are currently coming from the east at 12 mph, with gusts reaching up to 22 mph. According to the National Weather Service, there is a 50 percent chance of showers and thunderstorms this afternoon, with a high near 81°F.
The unsettled weather continues into Saturday night. Forecasters predict a 50 percent chance of showers and thunderstorms with a low around 70°F. Southeast winds will persist between 10 to 15 mph, with gusts potentially hitting 20 mph. Rainfall amounts tonight are expected to be less than a tenth of an inch, though higher amounts are possible within individual thunderstorms.
Sunday’s Forecast: High Probability of Rain
Sunday, April 12, will be the wettest day of the immediate forecast. The National Weather Service reports an 80 percent chance of precipitation, with showers and thunderstorms likely throughout the day. Expected rainfall totals range between a quarter and half of an inch.
The high for Sunday will be slightly cooler, reaching near 78°F, with south-southeast winds around 10 mph and gusts up to 20 mph. The chance of rain remains at 50 percent into Sunday night, primarily before 1 a.m., with a low around 70°F.
Looking Ahead: Monday and Tuesday
Conditions will begin to stabilize early next week, although some moisture remains in the air. Monday morning may start with patchy fog before 8 a.m., followed by mostly cloudy skies and a high near 84°F. There is a slight 20 percent chance of showers and thunderstorms after 1 p.m.
Tuesday’s forecast remains mostly cloudy with a high of 82°F and a continued slight chance of thunderstorms. Lows for both Monday and Tuesday nights are expected to hold steady around 69°F.
Key Weather Takeaways
- Highest Rain Risk: Sunday, April 12, with an 80% chance of precipitation.
- Expected Rainfall: 0.25 to 0.5 inches possible on Sunday.
- Temperature Trend: Highs will fluctuate between 78°F and 84°F through early next week.
- Wind Alerts: Southeast winds with gusts up to 22 mph are currently impacting the area.
Frequently Asked Questions
Will it rain all weekend in San Antonio?
While there is a 50% chance of rain on Saturday afternoon and night, Sunday is the primary concern with an 80% chance of showers and thunderstorms.
How much rain is expected on Sunday?
The National Weather Service anticipates rainfall amounts between a quarter and half of an inch on Sunday.
When will the weather clear up?
The probability of precipitation drops significantly by Monday, with only a 20% chance of showers after 1 p.m., though patchy fog is expected Monday morning.