San Antonio, TX Weather: September Heat Nears 100° Before Weekend Football Games Bring Storm Risk

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Football fans across San Antonio will sweat through the week as scorching heat lingers before storm chances rise during weekend games. Afternoon highs near 100°F Wednesday and Thursday could leave bleachers sweltering, and hydration will be critical for players and fans alike.

According to the National Weather Service in Austin/San Antonio, midweek conditions stay mostly sunny and dangerously hot. Highs are projected at 97°F Wednesday and up to 100°F Thursday, with little relief during evening commutes on I-35 or late practices across Bexar County. Officials advise residents to drink water often, use shade when possible, and check on vulnerable neighbors during peak heat hours.

By Friday night, the heat eases slightly, with highs topping out near 99°F before falling into the mid-70s overnight. That sets the stage for football under the lights, though early signs of moisture could bring clouds. Storm chances grow stronger by Saturday night, threatening to interrupt outdoor plans and create slick roads for weekend travel.

Forecasters expect a 40 to 50 percent chance of showers and thunderstorms Sunday into Monday. That pattern should trim daytime highs to the low 90s, offering the first taste of fall for San Antonio after a searing start to September.

Fans heading to games should plan for hydration Friday and keep an eye on updated advisories by Saturday.

Five Day Forecast for San Antonio, Texas

  • Wednesday: Sunny, high 97°F. Low 74°F. Light winds.
  • Thursday: Sunny and hot, high 100°F. Calm winds. Low 75°F.
  • Friday: Mostly sunny, high 99°F. Low 76°F. Hot conditions for evening games.
  • Saturday: 20–30% chance of thunderstorms. High 95°F. Low 77°F.
  • Sunday: 40% chance of showers and storms. High 94°F. Low 75°F.