San Antonio hits a partly sunny 91°F today, and while daytime hours stay mostly dry with just a 13% chance of rain, the National Weather Service says showers and thunderstorms move in tonight with a much better chance of flooding rain — so get your outdoor plans done before evening.
Today’s Setup
Skies stay partly sunny through the afternoon with light south-southeast winds of just 0 to 5 mph, keeping the muggy Gulf moisture pinned over the city. The NWS Austin/San Antonio office notes the airmass has fully recovered from Saturday’s storms and is warm and humid, setting up tonight’s flip. Rain chances jump to 62% after sunset, with a low around 76°F and a heat index as high as 101°F overnight because of that lingering humidity.
Best Window To Be Outside
If you’re planning a River Walk stroll, a Hill Country day trip, or yard work, this morning through mid-afternoon is your window before the atmosphere destabilizes tonight. Tuesday brings more of the same, with storms likely before 1 PM CT and a cooler high near 87°F — the forecast discussion expects most of the area to stay below 90°F under the cloud cover.
Rain, Flood, Or Heat Risk
This is the bigger story: the Weather Prediction Center has San Antonio and the southern Edwards Plateau under a Level 2 (Slight) risk for excessive rainfall today into Tuesday, and local forecasters say a Flood Watch could be issued as totals build to 1-3 inches, with isolated higher amounts possible tonight through Thursday night. Low-lying spots near the River Walk and area creeks are worth watching if you’re out late. Daytime heat is the other concern — with a high near 91°F and tropical humidity, stay hydrated and take shade breaks, especially if you’re outdoors near Fort Sam Houston or Lackland.
What To Wear Or Bring
Light, breathable layers help in this humidity — moisture wicking undershirts men are a smart pick, and talc free body powder keeps you comfortable if you’re out for hours. Cooling off before the evening storms roll in? A 2-Person Intex Floating Lounge with Cooler (outdoor gear deals) is perfect for the dry afternoon window. With storms stacking up through the week, it’s also a good time to check your backup power — the DARAN 288Wh Power Station (home deals) is worth a look ahead of any outages.
Around Town This Week
Carín León brings his De Sonora Para El Mundo Tour to Frost Bank Center this Thursday, July 16 — read our full concert preview and Get tickets on SeatGeek before they’re gone. Fans can grab a Carín León t-shirt or Carín León hat for the show. Grupo Frontera follows at Frost Bank Center on July 19 with their Triste Pero Bien C*bron Tour, and a Grupo Frontera t-shirt makes a good souvenir either way.
Tonight’s Dinner Idea
It’s too hot and muggy to fire up the stove — go with a cold Thai noodle salad, a build-your-own wrap bar, or smoothie bowls instead. A high-powered blender and an insulated tumbler 30oz make quick work of it. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Next Few Days
Expect the wettest stretch Tuesday night into Thursday night, per the local forecast discussion, with San Antonio staying unsettled and humid. The good news: dry weather is expected to return by the weekend, so outdoor plans for Saturday and Sunday look more promising.
