San Antonio heads into Tuesday with a high near 92°F and a heat index that could feel like 101°F — and if you have evening plans outdoors, wrap them up early, because a line of strong to severe storms is on track to move through the Alamo City tonight.
Today’s Setup
Skies will be partly sunny through the morning and early afternoon. The National Weather Service has a slight chance of storms between 1 PM and 4 PM CT — only about 20%, so your lunch plans are likely safe. Southeast winds at 10 to 15 mph with gusts up to 25 mph will keep it muggy all day. An insulated tumbler 30oz is worth packing if you’re logging hours outside near Lackland, Fort Sam Houston, or anywhere along the I-35 corridor.
Best Window To Be Outside
Get your outdoor business done before 5 PM CT. The Mission Trail, Brackenridge Park, and the Pearl district will all be pleasant in the morning — but midday shade breaks are non-negotiable when the heat index is brushing triple digits. Men’s sport sandals are the right call for anything that doesn’t require closed-toe shoes on a sweltering day like this.
Storm Risk Tonight
The National Weather Service has flagged a Level 2 of 5 severe weather risk, particularly along and west of the I-35 corridor. A line of storms will push southward from the Hill Country into San Antonio starting around 7 PM CT, with the heaviest activity expected between 10 PM and 4 AM CT. The main threats are damaging wind gusts and locally heavy rainfall — the NWS says half to three-quarters of an inch is possible. The Weather Prediction Center has also issued a Slight Risk for excessive rainfall across portions of Texas. Flash flooding is a real concern near the River Walk and at low-water crossings throughout Bexar County. San Antonio sits squarely in Flash Flood Alley — never drive through a flooded roadway, no matter how shallow it looks.
Events This Week: Know Before You Go
Juvenile plays the Aztec Theatre on Wednesday, May 20 — lingering showers are possible through midday Wednesday, so check conditions before heading downtown.
Triumph’s Rock & Roll Machine Reloaded Tour hits Frost Bank Center on Thursday, May 21. Conditions should be improving by then — Get tickets on SeatGeek if you’re still on the fence.
Big game Friday: the San Antonio Spurs host the Oklahoma City Thunder in West Conference Finals Game 3 at Frost Bank Center on May 22. The arena is climate-controlled so the action stays dry, but expect a potentially wet commute if storms linger mid-week. Show up ready with Official team gear on Fanatics — Go Spurs Go.
Dinner Tonight: Skip the Stove
With heat index values near 101°F, tonight is not the night to stand over a burner. Cold Thai noodle salad, a build-your-own wrap bar, or smoothie bowls are all ideal — fire up a high-powered blender for the smoothies and pour everything into an insulated tumbler to keep drinks cold while you wait out the storms. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Next Few Days
Wednesday brings a cooler 86°F but still carries a 40% storm chance, with another 80% chance Wednesday night. The National Weather Service warns of an active pattern through the Memorial Day weekend, with multiple rounds of storms and potential localized flooding across South Central Texas. Check the San Antonio weather forecast daily, and browse outdoor gear deals if you need to prepare for a wet week ahead.
