In October, San Marcos typically sees daytime highs of 25.3°C and overnight lows around 11.4°C. Compared to the annual average high of 23.0°C, October runs +2.2°C.
October in San Marcos averages a daytime high of 25.3°C and an overnight low of 11.4°C.
October runs +2.2°C compared to San Marcos's annual average high of 23.0°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 25.3°C and cooler evenings around 11.4°C.