San Antonio

San Antonio on Alert for Searing Heatwave with Possible Midweek Showers

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Published on September 22, 2025
San Antonio on Alert for Searing Heatwave with Possible Midweek ShowersSource: Google Street View

San Antonio faces a hot week ahead. The National Weather Service forecasts temperatures near 97 degrees today with heat index values up to 103. Skies will clear after early cloud cover, and south winds will range from 5 to 10 mph.

Tonight will remain mostly clear with lows near 76 degrees and southeast winds around 10 mph. On Tuesday, temperatures will rise to about 98 degrees with heat index values up to 104. South winds may gust up to 20 mph.

On Wednesday, there is a 60 percent chance of showers and possible thunderstorms after 1 p.m. Temperatures will reach about 96 degrees with north-northeast winds in the afternoon. Wednesday night carries a 50 percent chance of showers and thunderstorms with lows near 73 degrees and northeast winds of 5 to 10 mph.

Thursday brings a 30 percent chance of early showers and thunderstorms followed by mostly sunny skies with highs near 90 degrees.

Friday is expected to be mostly sunny with highs near 93 degrees. Winds will shift from north-northeast to southeast in the afternoon. Nighttime lows will be near 70 degrees with mostly clear skies. A slight chance of showers remains for Sunday.