San Antonio starts Saturday, July 11 with a slight chance of morning showers and warms to a partly sunny high near 90°F, with a 40% chance of showers and thunderstorms arriving by afternoon, according to the National Weather Service. If you’ve got yard work, errands, or a River Walk stroll planned, get it done before midday — forecasters say storms fire up from the coast and push west through the afternoon and evening.
Today’s Setup
Overnight lows near 76°F with a light southeast wind around 5 mph gave way to Saturday’s high near 90°F, southeast wind 5 to 10 mph, and a 40% chance of showers and storms. The NWS Austin/San Antonio office notes individual storms could drop a quick half inch of rain even though overall totals stay modest. Saturday night stays mild, low near 76°F, with another 40% chance of storms before 4 AM CT Sunday.
Best Window To Be Outside
Morning through around 10 AM CT is your driest stretch — good timing for Brackenridge Park, a Hill Country tee time, or River Walk foot traffic before the atmosphere destabilizes. Once storms develop in the afternoon, they can be hit-or-miss but locally intense, so keep outdoor plans flexible.
Rain, Wind, And Flood Risk
The NWS’s key message for this forecast period: daily rain chances could add up to cumulative totals over 3 inches by Tuesday. In flash-flood-alley San Antonio, that means watching low-water crossings and any spot that’s flooded before, especially near the River Walk. The Weather Prediction Center has a slight risk of excessive rainfall today stretching across parts of the southern Plains, so a stalled storm cell could produce brief, localized flooding even without a formal warning. Sunday’s storm chance drops to 24% with a high near 92°F, but moisture builds into Monday and Tuesday as a trough digs over Texas, raising the odds of heavier rain.
What To Wear Or Bring
A packable rain jacket earns its keep on an afternoon like this, and waterproof hiking boots are smart if trails or parks turn muddy. Keep an insulated water bottle on hand for the muggy stretches before storms roll in. And if thunderstorms knock out power at your place this weekend, it’s worth checking the DARAN 288Wh Power Station deal we’re tracking this week before storm season ramps up further.
On The Calendar This Week
Carín León brings his De Sonora Para El Mundo Tour to Frost Bank Center on July 16 — see our Carín León concert coverage for more, and grab a Carín León t-shirt, Carín León hoodie, or Carín León hat before the show. Get tickets on SeatGeek if you still need seats. The Drum Corps International Southwestern Championship rolls into the Alamodome on July 18 — Find tickets on StubHub. If you’re up for the drive up I-35, PFL Austin also lands at Moody Center ATX that same day.
Rainy Day Dinner
With storms on the radar, let a programmable slow cooker handle chili or beef stew while the rain moves through, or build a pot of soup in an enameled cast iron Dutch oven on the stove. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Next Few Days
Sunday eases to a 24% storm chance with a high near 92°F. The bigger story arrives Monday and Tuesday, when deep Gulf moisture and a digging trough bring better rain chances and the potential for locally heavy rainfall — worth watching if you’re near typical flood-prone spots around town. If you’re planning any outdoor gear runs before the wetter stretch, check the current outdoor gear deals on the site this week.
