Fairfax Weather Forecast

    • 53
    • 78

    Sunny

    • 54
    • 78

    Sunny

    • 56
    • 87

    Sunny

    • 55
    • 102

    Hot

    • 55
    • 95

    Mostly Sunny

    • 55
    • 86

    Mostly Sunny

Today 18 Aug North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the upper 60s to mid 80s. West Winds 5 to 10 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 18 Aug North Bay Interior Valleys

Mostly clear except patchy fog after midnight. Lows in the upper 40s to mid 50s. West Winds 5 to 15 Mph.

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Fairfax Temperature Statistics

August Temperature

Novato / Gnoss Field (10.6 miles)

  • Lowest 2 August, 2025

    48.2 °F

  • Average August

    65.2 °F

  • Highest 8 August, 2025

    96.8 °F

Climate (2020–Present)

Novato / Gnoss Field (10.6 miles)

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    57.5 °F

  • Average High 2020–2025

    72.6 °F
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