In October, San Marcos typically sees daytime highs of 27.6°C and overnight lows around 13.9°C. Compared to the annual average high of 26.3°C, October runs +1.3°C.
October in San Marcos averages a daytime high of 27.6°C and an overnight low of 13.9°C.
October runs +1.3°C compared to San Marcos's annual average high of 26.3°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 27.6°C and cooler evenings around 13.9°C.