San Antonio is waking up to one of the most dangerous heat days of the summer — a sunny, brutal 98°F high with a heat index that could feel as high as 114°F this afternoon. If you’re anywhere along the San Antonio weather forecast zone, the National Weather Service has issued an Excessive Heat Warning for the I-35 Corridor, and that means us.
Today’s Setup
Post-tropical storm Arthur pushed a warm, moist Gulf airmass over South-Central Texas, and now that the system is drifting away to the northeast, the subtropical ridge is building right back in behind it — sealing in the heat. Expect zero rain relief today (0% chance), wall-to-wall sunshine, and SSE winds at 5 to 10 mph with gusts to 20 mph. Dewpoints are staying stubbornly high, which is why that 98°F air feels closer to 114°F.
Best Window To Be Outside
Get any outdoor chores done before 9 AM. Dog walks along the River Walk, a morning jog near Brackenridge Park, or yard work — all of it needs to wrap up early. After mid-morning, heat index values above 110°F can cause heat exhaustion in less than 30 minutes for active adults. Stay close to air conditioning through the afternoon.
Heat and Fire Risk
Gusting southerly winds plus extreme heat and low relative humidity raise fire weather concerns, especially toward the Hill Country northwest of town. Check your smoke detector combo pack now — fresh batteries cost nothing and save lives. Keep a fire blanket kitchen accessible near your stove, and if you live on the rural edges of Bexar County, consider putting together a go bag emergency evacuation kit in case conditions deteriorate quickly. An N95 respirator mask smoke is also smart to have on hand if brush fire smoke drifts your way.
Spurs Game 7 on Juneteenth
The Alamo City has one more reason to sweat: the San Antonio Spurs host the New York Knicks in a potential NBA Finals Game 7 on Friday, June 19 at Frost Bank Center. The game is indoors, so the 94°F heat won’t affect the court — but Friday evening carries a 37% chance of showers and thunderstorms, so if you’re tailgating or parking downtown, have a rain plan. Grab your Official team gear on Fanatics before packing your cooler. Still need seats? Get tickets on SeatGeek or Find tickets on StubHub.
Also tonight, the Summer Walker: Still Finally Over It Tour hits Moody Center ATX — a quick run up I-35 if you want to make an evening of it.
What To Wear
Lightweight is everything today. men’s sport sandals are ideal for any errands or a short stroll downtown. Pool-bound? quick dry swim trunks and a women’s swimsuit will be your best friends. Check out outdoor gear deals if you’re stocking up for the weekend.
Beat the Heat at Dinner
Don’t touch that oven. Tonight calls for cold Thai noodle salad, smoothie bowls, or a build-your-own wrap bar — zero heat required. A high-powered blender makes frozen smoothies and chilled soups effortless. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Next Few Days
Tonight stays warm and mostly cloudy, low near 80°F. Juneteenth brings a high near 94°F with a slight storm chance after 1 PM CT. Friday night bumps rain odds to 37% as Gulf moisture surges north — keep an eye on Flash Flood Alley drainage if storms train over the same areas. The weekend looks more active, which may finally bring some temperature relief heading into next week.
