In July, San Marcos typically sees daytime highs of 35.0°C and overnight lows around 22.2°C. Compared to the annual average high of 26.3°C, July runs +8.7°C.
July in San Marcos averages a daytime high of 35.0°C and an overnight low of 22.2°C.
July runs +8.7°C compared to San Marcos's annual average high of 26.3°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 35.0°C and cooler evenings around 22.2°C.