San Pablo Bay - The Sisters Weather Forecast

    • 59
    • 68

    Sunny

    • 60
    • 67

    Becoming Sunny

    • 60
    • 70

    Mostly Sunny

    • 60
    • 75

    Sunny

    • 59
    • 74

    Sunny

    • 59
    • 72

    Sunny

    • 58
    • 68

    Mostly Sunny

Today 12 Sep North Bay Interior Valleys

Sunny. Highs in the lower 70s to mid 80s. Southwest Winds 10 to 20 Mph.

Tonight 12 Sep North Bay Interior Valleys

Mostly clear except patchy fog after midnight. Lows in the 50s. Southwest Winds 10 to 20 Mph. Becoming 5 to 10 Mph after midnight.

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San Pablo Bay - The Sisters Temperature Statistics

September Temperature

Novato / Gnoss Field (11.8 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    66.1 °F

  • Highest 1 September, 2025

    89.6 °F

Climate (2020–Present)

Novato / Gnoss Field (11.8 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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