San Antonio, Texas – The morning sun is already turning sidewalks and parking lots into heat traps across South Texas. A light breeze offers little relief, and the hottest part of the day is still ahead as another stretch of midsummer heat settles over the San Antonio area.
Hot and increasingly humid conditions will dominate South Central Texas through early next week, with afternoon temperatures climbing into the middle 90s while the heat index pushes well above 100 degrees. According to the National Weather Service in Austin/San Antonio, skies gradually become mostly sunny today after early cloud cover, sending temperatures to 94 degrees with heat index values reaching 101 degrees by the afternoon.
Sunday turns even hotter. Highs climb to 95 degrees, while humidity drives the heat index to 104 degrees, creating dangerous conditions for anyone spending extended time outdoors. Little relief is expected Monday and Tuesday, with highs remaining near 95 degrees under mostly sunny skies. Overnight temperatures only fall into the middle 70s, limiting recovery from the daytime heat.
The broader weather pattern continues to favor expanding heat across much of the Southern Plains and Texas. While widespread rain is not expected around San Antonio through Tuesday, the prolonged warmth increases the risk of heat-related illnesses, especially during the afternoon and early evening.
If you’re traveling along Interstate 35, Loop 410, U.S. 281, or Interstate 10, expect shimmering pavement and very hot vehicle interiors. Never leave children or pets inside parked vehicles, even briefly. Drink water frequently, wear lightweight clothing, and schedule outdoor work during the early morning or near sunset whenever possible.
Long-range outlooks continue to favor above-normal temperatures into late next week, suggesting the summer heat will remain firmly in place across South Texas.
Five-Day Forecast for San Antonio, Texas
- Sunday: Mostly sunny. High 95°F, Low 74°F. Heat index up to 104°F.
- Monday: Sunny. High 95°F, Low 73°F.
- Tuesday: Sunny. High 95°F, Low 74°F.
- Wednesday: Sunny. High 94°F, Low 77°F.
- Thursday: Sunny. High 96°F, Low 78°F.
