In April, San Marcos typically sees daytime highs of 20.8°C and overnight lows around 8.4°C. Compared to the annual average high of 23.0°C, April runs -2.2°C.
April in San Marcos averages a daytime high of 20.8°C and an overnight low of 8.4°C.
April runs -2.2°C compared to San Marcos's annual average high of 23.0°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 20.8°C and cooler evenings around 8.4°C.