In July, San Marcos typically sees daytime highs of 29.9°C and overnight lows around 20.2°C. Compared to the annual average high of 30.2°C, July runs -0.3°C.
July in San Marcos averages a daytime high of 29.9°C and an overnight low of 20.2°C.
July runs -0.3°C compared to San Marcos's annual average high of 30.2°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 29.9°C and cooler evenings around 20.2°C.