In March, San Antonio typically sees daytime highs of 31.9°C and overnight lows around 20.7°C. Compared to the annual average high of 28.9°C, March runs +3.0°C.
March in San Antonio averages a daytime high of 31.9°C and an overnight low of 20.7°C.
March runs +3.0°C compared to San Antonio's annual average high of 28.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 31.9°C and cooler evenings around 20.7°C.