Fairfax Weather Forecast

    • 55
    • 73

    Increasing Clouds

    • 55
    • 73

    Chance Drizzle

    • 52
    • 72

    Chance Drizzle

    • 52
    • 76

    Mostly Sunny

    • 52
    • 78

    Mostly Sunny

    • 53
    • 78

    Mostly Sunny

    • 56
    • 84

    Mostly Sunny

Today 1 Sep North Bay Interior Valleys

Partly cloudy. Highs in the mid 60s to upper 70s. Southwest Winds 10 to 20 Mph.

Tonight 1 Sep North Bay Interior Valleys

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog. A chance of drizzle after midnight. Lows in the 40s to upper 50s. Southwest Winds 10 to 20 Mph. Becoming south up to 5 Mph after midnight.

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Fairfax Temperature Statistics

September Temperature

Novato / Gnoss Field (10.6 miles)

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Climate (2021–2026)

Novato / Gnoss Field (10.6 miles)

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  • Average Low 2021–2026

    46.9 °F

  • Average 2021–2026

    57.8 °F

  • Average High 2021–2026

    72.5 °F
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