In August, San Marcos typically sees daytime highs of 28.8°C and overnight lows around 16.2°C. Compared to the annual average high of 23.0°C, August runs +5.8°C.
August in San Marcos averages a daytime high of 28.8°C and an overnight low of 16.2°C.
August runs +5.8°C compared to San Marcos's annual average high of 23.0°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 28.8°C and cooler evenings around 16.2°C.