San Antonio, Texas – San Antonio’s stretch of sizzling September weather continues Thursday with temperatures soaring to a dangerous 101°F before weekend storms arrive. Outdoor workers, drivers, and football fans should take extra precautions starting Thursday afternoon as the region shifts from extreme heat to unstable conditions by Saturday.
According to the National Weather Service, Thursday’s high will top out at 101°F under clear skies with barely any breeze—raising heat index values to near 105°F. The heat advisory hasn’t been issued yet, but officials urge residents to hydrate, avoid midday sun, and limit outdoor activities. Winds stay calm until a light breeze returns Thursday night, offering little relief.
By Saturday, the chance of showers and thunderstorms begins to climb—first slight (20%) on Saturday afternoon, then jumping to a 60% chance by Sunday. This could affect outdoor plans and football games across Bexar County, especially events scheduled after 1 p.m. Storms may bring lightning, localized flooding, and travel disruptions on I-35 and Loop 410.
If you’re attending Friday night football or planning weekend events, keep a backup plan. Rain may not arrive until late Saturday, but scattered storms could linger through early next week.
Five-Day Forecast for San Antonio, Texas:
- Thursday: Sunny and dangerously hot, high 101°F. Calm wind turning southwest at 5 mph.
- Friday: Mostly sunny, high 99°F. Light winds, low around 76°F.
- Saturday: Partly sunny, 20% chance of afternoon storms. High near 95°F.
- Sunday: Showers and storms likely after 1 p.m., 60% chance. High near 90°F.
- Monday: Partly sunny with a 50% chance of storms. High around 90°F.
