San Antonio starts Sunday partly sunny with a high near 92°F, a heat index climbing to 101, and just a 20% chance of afternoon showers and storms — comfortable enough for outdoor plans if you respect the heat and keep one eye on the radar.
Today’s Setup
The National Weather Service in Austin/San Antonio says southeasterly flow is helping the airmass recover after Saturday’s convection knocked temperatures down overnight, with lows this morning a touch cooler than yesterday. Expect a slight chance of rain showers early, then a slight chance of showers and thunderstorms later, but forecasters expect less storm coverage than Saturday. Winds stay light out of the southeast at 5 to 10 mph.
Best Window To Be Outside
Despite the heat index near 101°F, today and Monday actually run a few degrees below normal for mid-July, per the NWS discussion. Late morning into early afternoon is your best window before any isolated storm activity develops — good timing for the River Walk, a Hill Country day trip, or errands around Lackland or Fort Sam Houston. Monday’s better storm chances arrive specifically between 1 PM and 4 PM CT, so plan outdoor work before lunch.
Rain, Wind, Or Flood Risk
The NWS’s key message is daily rain chances through at least Thursday, with locally heavy rainfall and minor flooding possible. The best chance for heavy rain arrives Monday night through Wednesday night, as moisture deepens with precipitable water values topping two inches. Most of the area carries a Marginal (Level 1) excessive rainfall risk Monday through Wednesday, with a Slight (Level 2) risk specifically for the Southern Edwards Plateau — Hill Country terrain prone to fast runoff. Given San Antonio’s flash-flood-alley reputation, avoid low-water crossings once heavier cells arrive, and consider a DARAN 288Wh Power Station on hand in case storms knock out power.
What To Wear Or Bring
Humidity and heat index values near 101°F call for light, breathable clothing and water breaks. Toss a packable rain jacket in your bag for any pop-up shower, and a waterproof phone pouch is smart if you’re near the River Walk or Hill Country creeks this week.
Local Events & Games
Carín León brings the De Sonora Para El Mundo Tour to Frost Bank Center on Thursday, July 16 — read our Carín León concert coverage, then grab tickets on SeatGeek or find tickets on StubHub. Fans can rep the tour in a Carín León t-shirt, Carín León hoodie, or Carín León hat. The Alamodome hosts the Drum Corps International 2026 Southwestern Championship on Saturday, July 18, while PFL Austin lands at Moody Center ATX the same day — both indoors, so this week’s storm chances won’t be a factor for either.
Dinner Tonight
With storm chances lingering into the evening, this is comfort-food weather: slow cooker chili, beef stew, or a big pot of soup. A programmable slow cooker or an enameled cast iron Dutch oven makes it easy. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Next Few Days
Rain chances hold through at least Thursday, with Monday night through Wednesday night bringing the best shot at locally heavy rain and possible flooding, especially over the Hill Country. Keep outdoor plans flexible and check back for updates as the pattern evolves.
