San Antonio/ Weather & Environment

San Antonio Sizzles at 98 as Storm Chances Fizzle

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Published on September 17, 2026
San Antonio Sizzles at 98 as Storm Chances FizzleSource: Google Street View

San Antonio is headed for another furnace-like day Thursday, with temperatures climbing to 98 degrees and the heat index reaching as high as 107. A few showers or thunderstorms could develop after 1 p.m., but most of the city should stay dry as summer refuses to leave quietly.

Afternoon Storm Chances Stay Spotty

The National Weather Service forecast calls for a 20% chance of showers and thunderstorms Thursday afternoon and evening, with the best odds along the I-35 corridor and toward the coastal plains. Onshore flow will continue, and evening gusts may exceed 20 knots along the I-35 corridor, according to the National Weather Service.

Rain chances remain limited, so a passing shower could offer only a brief break from the heat rather than a citywide cooldown. Thursday night will stay mostly cloudy, with a low around 77 and a 20% chance of showers or thunderstorms before 10 p.m.

Another Hot Weekend Ahead

Friday will be mostly sunny with above-normal temperatures. Saturday should be sunny and slightly cooler at 97, while Sunday returns to mostly sunny skies and a high near 98.

The heat continues into next week, with above-normal high temperatures likely. Rain chances remain uncertain next week.

Heat Still The Main Concern

No watches or warnings are listed for the San Antonio area, but a heat index near 107 can still make outdoor work, exercise, and afternoon errands risky. Drink plenty of water, take breaks in air conditioning or shade, and avoid treating a low rain chance as a low-heat day.