In July, San Marcos typically sees daytime highs of 28.4°C and overnight lows around 15.4°C. Compared to the annual average high of 23.0°C, July runs +5.3°C.
July in San Marcos averages a daytime high of 28.4°C and an overnight low of 15.4°C.
July runs +5.3°C compared to San Marcos's annual average high of 23.0°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 28.4°C and cooler evenings around 15.4°C.