San Antonio is starting Saturday clear and already warm, with a punishing afternoon ahead. Highs are expected to reach about 103 degrees, while the heat index could climb as high as 109. A Heat Advisory will be in effect from noon to 7 p.m. Saturday.
The advisory covers the I-35 corridor and Coastal Plains, where temperatures could reach 105 degrees and heat index values could touch 111, according to the National Weather Service. South-southeast winds should stay around 5 to 10 mph during the afternoon, offering little relief from the heat.
Heat Builds Through The Afternoon
Temperatures are expected to rise through the morning, reaching the upper 90s by early afternoon and topping 100 degrees later in the day. Rain chances are near zero around San Antonio, so outdoor plans will face heat rather than storms as the main concern.
Saturday night will remain partly cloudy and muggy, with a low around 79 degrees. Southeast winds could increase to 15 mph, with gusts up to 25 mph, but the overnight heat index may still reach 106.
Triple-Digit Heat Sticks Around
The heat does not break quickly. Sunday is forecast to reach 101 degrees, followed by highs near 100 Monday and Tuesday, 99 Wednesday and 97 Thursday; overnight lows will mostly stay in the upper 70s.
Rain chances remain minimal through Wednesday before a slight chance of showers and thunderstorms arrives Thursday afternoon. Friday looks mostly sunny with a high near 96, making it cooler by comparison but still decidedly warm.
Take Heat Precautions
Residents should drink plenty of fluids, limit strenuous outdoor activity during the afternoon and seek air conditioning or shade during the advisory period. Never leave children, older adults or pets in a parked vehicle, and check on neighbors who may be especially vulnerable to heat illness.
