San Antonio residents could face another punishing stretch of heat as Patriot Day events approach Thursday, September 11. Triple-digit highs and ongoing air quality alerts pose health risks, especially for outdoor ceremonies and commuters along I-35 and Loop 410. Residents are urged to limit prolonged outdoor activity during peak afternoon hours.
According to the National Weather Service in Austin/San Antonio, Thursday’s high will reach near 100 degrees, with light northeast winds offering little relief. An air quality alert remains in effect, with sensitive groups—children, seniors, and those with respiratory issues—most at risk. City officials urge event planners to provide shade and hydration stations at public Patriot Day gatherings.
Roadways could heat to dangerous levels during afternoon traffic, raising concerns for breakdowns and tire blowouts. Drivers on I-10, I-35, and Loop 410 should carry extra water, check tire pressure, and avoid leaving pets or children in vehicles. CPS Energy also reminds residents to conserve power where possible, as increased demand during heat peaks strains the grid.
The extended stretch of hot, mostly clear conditions will continue into the weekend, with highs in the mid to upper 90s. Nights will offer slight relief, dropping into the low 70s, but not enough for true cooling. Light southeast winds Friday into Saturday may help disperse pollution and bring minor comfort.
Warnings remain in place through the weekend. Another update is expected if conditions intensify heading into early next week.
Five-Day Forecast for San Antonio, TX
- Thursday: Sunny, high near 100. Northeast winds 5–10 mph.
- Friday: Sunny, high near 96. Southeast winds 5–10 mph.
- Saturday: Partly cloudy, high near 96. South winds 5–10 mph.
- Sunday: Mostly sunny, high near 96. Low around 72.
- Monday: Sunny, high near 95. Low around 72.
