In March, San Marcos typically sees daytime highs of 31.8°C and overnight lows around 19.2°C. Compared to the annual average high of 30.2°C, March runs +1.6°C.
March in San Marcos averages a daytime high of 31.8°C and an overnight low of 19.2°C.
March runs +1.6°C compared to San Marcos's annual average high of 30.2°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 31.8°C and cooler evenings around 19.2°C.