San Antonio started Wednesday under cloudy, muggy skies near 80°F, but the soft-looking morning is a prelude to a 99°F afternoon and heat index readings as high as 107°F. Skies should turn mostly sunny, and rain is not expected.
Heat Builds Through Friday
Temperatures rise to about 100°F Thursday before reaching 102°F Friday, the hottest day in the near-term forecast. South to southeast winds around 5 to 10 mph will offer only modest relief, while gusts could reach 25 mph Wednesday and Thursday evenings.
Weekend Heat Hangs On
Saturday is forecast near 101°F and Sunday near 100°F, with mostly sunny skies dominating both days. A small opening for rain arrives Saturday night into Sunday, when the National Weather Service says a front could trigger isolated to scattered showers or storms; current daily rain chances remain low at 5% Saturday and 10% Sunday.
Warm Nights Keep The Heat Risk Elevated
Wednesday night only falls to around 78°F, followed by lows near 77°F Thursday night and 78°F Friday night. Overnight heat-index values early in the stretch could still reach 105°F to 106°F, making it harder for homes and bodies to recover after sunset.
Plan Around The Afternoon Peak
No watches, warnings or advisories are listed for the San Antonio area in the current forecast. Still, residents should schedule strenuous outdoor work for earlier or later hours, drink water regularly, take cooling breaks and check on older adults, neighbors and pets during the hottest part of the day.
