In August, San Antonio typically sees daytime highs of 15.5°C and overnight lows around 6.1°C. Compared to the annual average high of 18.7°C, August runs -3.2°C.
August in San Antonio averages a daytime high of 15.5°C and an overnight low of 6.1°C.
August runs -3.2°C compared to San Antonio's annual average high of 18.7°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 15.5°C and cooler evenings around 6.1°C.