In July, Petaluma typically sees daytime highs of 23.1°C and overnight lows around 10.6°C. Compared to the annual average high of 18.5°C, July runs +4.6°C.
July in Petaluma averages a daytime high of 23.1°C and an overnight low of 10.6°C.
July runs +4.6°C compared to Petaluma's annual average high of 18.5°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 23.1°C and cooler evenings around 10.6°C.