In October, San Mateo typically sees daytime highs of 29.8°C and overnight lows around 18.8°C. Compared to the annual average high of 29.6°C, October runs +0.2°C.
October in San Mateo averages a daytime high of 29.8°C and an overnight low of 18.8°C.
October runs +0.2°C compared to San Mateo's annual average high of 29.6°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 29.8°C and cooler evenings around 18.8°C.