In March, San Marcos typically sees daytime highs of 22.8°C and overnight lows around 9.1°C. Compared to the annual average high of 26.3°C, March runs -3.5°C.
March in San Marcos averages a daytime high of 22.8°C and an overnight low of 9.1°C.
March runs -3.5°C compared to San Marcos's annual average high of 26.3°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 22.8°C and cooler evenings around 9.1°C.