Petaluma River - Black John Slough Entrance Weather Forecast

    • 45
    • 67

    Increasing Clouds

    • 43
    • 71

    Mostly Sunny

    • 45
    • 72

    Mostly Sunny

    • 45
    • 74

    Mostly Sunny

    • 46
    • 74

    Partly Sunny

    • 45
    • 72

    Mostly Cloudy

Today 4 Nov North Bay Interior Valleys

Sunny in the morning then becoming partly cloudy. Patchy fog in the morning. Highs in the 60s. Northwest Winds 5 to 15 Mph.

Tonight 4 Nov North Bay Interior Valleys

Mostly cloudy in the evening then becoming partly cloudy. Lows in the 40s to lower 50s. Northwest Winds 5 to 15 Mph.

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Petaluma River - Black John Slough Entrance Temperature Statistics

November Temperature

Novato / Gnoss Field (1.9 miles)

  • Lowest 1 November, 2026

    46.4 °F

  • Average November

    56.2 °F

  • Highest 1 November, 2026

    71.6 °F

Climate (2021–2026)

Novato / Gnoss Field (1.9 miles)

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  • Average Low 2021–2026

    47 °F

  • Average 2021–2026

    57.9 °F

  • Average High 2021–2026

    72.6 °F
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