In October, Walnut Creek typically sees daytime highs of 22.9°C and overnight lows around 9.6°C. Compared to the annual average high of 20.0°C, October runs +2.9°C.
October in Walnut Creek averages a daytime high of 22.9°C and an overnight low of 9.6°C.
October runs +2.9°C compared to Walnut Creek's annual average high of 20.0°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 22.9°C and cooler evenings around 9.6°C.