San Antonio, Texas – Brutal heat returns to central Texas Sunday, as San Antonio faces triple-digit highs and a dangerous heat index nearing 108°F.
According to the National Weather Service, Sunday, June 8, will bring high temperatures around 101°F with increasing humidity, pushing the heat index well above 105°F by late afternoon. South winds gusting to 20 mph will offer little relief. Residents traveling along I-35 and other major roadways should avoid extended outdoor activity from noon to 6 p.m.
By Monday night, a shift begins. Isolated thunderstorms are possible late Monday, increasing to a 50% chance by Tuesday night. Showers could bring brief relief from the heat, but also the risk of gusty winds and localized street flooding. The best chance for rainfall is Tuesday night into Wednesday morning, when some areas may receive measurable totals and isolated downpours.
If you’re planning outdoor events or travel, adjust schedules for early mornings or late evenings. Keep water handy, check on elderly neighbors, and avoid leaving pets or children in vehicles — even for a moment.
Rain chances taper by Thursday, though warm and humid conditions will persist through midweek.
Extended 5-Day San Antonio Forecast (June 7–June 12):
- Saturday (June 7): Mostly sunny and hot, high 99°F. Heat index near 107°F.
- Sunday (June 8): High 101°F, heat index near 108°F. Sunny and dangerous heat expected.
- Monday (June 9): High 100°F. Slight chance of storms Monday night.
- Tuesday (June 10): 40% chance of showers. High 96°F. Storms likely Tuesday night.
- Wednesday (June 11): 60% chance of showers, mainly before 1 p.m. High near 91°F.
- Thursday (June 12): 20% storm chance. High near 90°F. Warm and partly cloudy.
