San Pablo Bay - Petaluma River Entrance Weather Forecast

    • 54
    • 80

    Mostly Sunny

    • 55
    • 89

    Mostly Sunny

    • 54
    • 89

    Mostly Sunny

    • 55
    • 85

    Mostly Sunny

    • 57
    • 85

    Mostly Sunny

    • 57
    • 85

    Mostly Sunny

    • 56
    • 84

    Mostly Sunny

Today 28 Sep North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Highs in the upper 70s to lower 90s.

Tonight 28 Sep North Bay Interior Valleys

Mostly clear. Lows in the 50s to lower 60s. West Winds 10 to 15 Mph decreasing to up to 5 Mph after midnight.

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San Pablo Bay - Petaluma River Entrance Temperature Statistics

September Temperature

Novato / Gnoss Field (3.7 miles)

  • Lowest 6 September, 2026

    48.2 °F

  • Average September

    65.7 °F

  • Highest 9 September, 2026

    100.4 °F

Climate (2021–2026)

Novato / Gnoss Field (3.7 miles)

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  • Average Low 2021–2026

    47 °F

  • Average 2021–2026

    57.8 °F

  • Average High 2021–2026

    72.4 °F
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