| NWS Forecast for: San Marcos TX Issued by: National Weather Service Austin/San Antonio, TX Last Update: 5:18 am CDT Sep 8, 2026 |  |
| Today: A 20 percent chance of showers and thunderstorms after 4pm. Sunny and hot, with a high near 99. Heat index values as high as 106. Calm wind becoming south around 5 mph in the afternoon. Tonight: A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 77. Southeast wind around 5 mph becoming calm after midnight. Wednesday: Mostly sunny, with a high near 97. Heat index values as high as 105. Calm wind becoming southeast around 5 mph in the afternoon. Wednesday Night: Mostly clear, with a low around 76. Southeast wind around 5 mph becoming calm after midnight. Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. Calm wind becoming south around 5 mph. Thursday Night: Partly cloudy, with a low around 76. East wind around 5 mph becoming south southwest after midnight. Friday: Sunny, with a high near 98. Calm wind becoming south around 5 mph in the morning. Friday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 76. South southeast wind 5 to 10 mph. Saturday: Sunny, with a high near 98. South wind 5 to 10 mph, with gusts as high as 20 mph. Saturday Night: Mostly clear, with a low around 76. Sunday: Mostly sunny, with a high near 97. Sunday Night: Mostly clear, with a low around 76. Monday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96. | |
| San Marcos TX 29.88°N 97.94°W (Elev. 577 ft) | |
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