In October, San Marcos typically sees daytime highs of 28.9°C and overnight lows around 19.8°C. Compared to the annual average high of 30.2°C, October runs -1.3°C.
October in San Marcos averages a daytime high of 28.9°C and an overnight low of 19.8°C.
October runs -1.3°C compared to San Marcos's annual average high of 30.2°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 28.9°C and cooler evenings around 19.8°C.