San Antonio is heading into a mostly sunny Thursday with a forecast high of 91°F — solid late-spring weather for most outdoor plans, but the San Antonio weather forecast comes with an important caveat: the TCEQ has issued an Ozone Action Day alert for the area today, so residents with asthma, allergies, or respiratory conditions need to plan their day carefully.
Today’s Setup
A strong mid-level ridge is parked directly over Central Texas, keeping storm chances well to the north and mixing dry air down from aloft. South winds start light — 0 to 10 mph this morning — then ramp toward gusts near 20 mph by afternoon as the ridge drifts east. Humidity stays relatively low today, giving SA a brief reprieve before Gulf moisture floods back in this weekend.
Best Window To Be Outside
Aim for the morning hours. Whether you’re walking the Mission Reach, exploring the grounds near the Pearl District, or getting yardwork done in Alamo Heights, try to wrap up outdoor activity before 11 AM CT. The National Weather Service notes that poor air dispersion peaks in the afternoon when heat builds and surface pollutants concentrate. If you’re planning a round of golf before the heat ramps up, the best golf balls for high handicappers in 2026 are worth a look. No matter what you’re doing outside, carry an insulated tumbler 30oz — in 91°F heat you’ll drain it faster than you expect.
Heat and Allergy Risk
Today’s Ozone Action Day is a direct result of the ridge overhead trapping pollutants near the surface. That’s compounded by May’s elevated pollen load — mountain cedar and oak are still lingering across the Hill Country, and San Antonio sits right in the drift zone. If sweat and friction are your adversary during SA’s early summer, talc free body powder has become a go-to for locals navigating these first hot weeks.
Events This Weekend
Spurs fans, Sunday, May 17 is the one to circle: the San Antonio Spurs host the Minnesota Timberwolves at Frost Bank Center in what could be a West Conference Semis Game 7. Outside temps will be near 90°F, so tailgating will be warm but completely dry. Represent in a San Antonio Spurs jersey and lock in your seats through Find tickets on StubHub before they disappear. Also worth noting: George Strait plays Moody Center ATX in Austin on Friday, May 15 — a short drive up I-35 with no rain in the forecast and a high near 92°F. A George Strait hat keeps the sun off on the walk in.
Tonight’s Dinner Idea
It’s too hot to fire up the oven — go cold tonight. Smoothie bowls or a build-your-own wrap bar come together fast and keep the kitchen cool. A high-powered blender handles smoothie prep in minutes, and keeping servings cold in an insulated tumbler 30oz makes the heat a little more tolerable. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Next Few Days
Tonight stays partly cloudy with a low around 69°F and SSE winds gusting to 20 mph. Friday and Saturday both top out near 92°F — south winds pick up to gusts around 25 mph Friday, but rain stays well away. The dry stretch holds through Sunday afternoon. After that, the National Weather Service flags low-to-medium storm chances Sunday night through Wednesday, with locally heavy rainfall possible. Heat indices could reach 100–105°F or higher on Sunday, Monday, and Tuesday as Gulf moisture surges back. Get your outdoor errands and weekend plans done in the next two days — next week will be a different story.
