In April, San Marcos typically sees daytime highs of 31.6°C and overnight lows around 20.4°C. Compared to the annual average high of 30.2°C, April runs +1.4°C.
April in San Marcos averages a daytime high of 31.6°C and an overnight low of 20.4°C.
April runs +1.4°C compared to San Marcos's annual average high of 30.2°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 31.6°C and cooler evenings around 20.4°C.