In October, Petaluma typically sees daytime highs of 21.1°C and overnight lows around 9.1°C. Compared to the annual average high of 18.5°C, October runs +2.5°C.
October in Petaluma averages a daytime high of 21.1°C and an overnight low of 9.1°C.
October runs +2.5°C compared to Petaluma's annual average high of 18.5°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 21.1°C and cooler evenings around 9.1°C.