Petaluma River - Black John Slough Entrance Weather Forecast

    • 48
    • 77

    Mostly Sunny

    • 49
    • 76

    Mostly Sunny

    • 51
    • 77

    Mostly Sunny

    • 48
    • 76

    Partly Sunny

    • 49
    • 76

    Mostly Cloudy

    • 50
    • 77

    Mostly Cloudy

Today 22 Mar North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Patchy dense fog in the morning. Highs in the upper 60s to lower 80s. West Winds up to 5 Mph increasing to southwest 10 to 15 Mph in the afternoon.

Tonight 22 Mar North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Lows in the 40s to mid 50s. West Winds 5 to 15 Mph.

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Petaluma River - Black John Slough Entrance Temperature Statistics

March Temperature

Novato / Gnoss Field (1.9 miles)

  • Lowest 10 March, 2026

    42.8 °F

  • Average March

    61.1 °F

  • Highest 18 March, 2026

    91.4 °F

Climate (2021–Present)

Novato / Gnoss Field (1.9 miles)

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  • Average Low 2021–2026

    46.5 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    72.5 °F
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