Petaluma River - Black John Slough Entrance Weather Forecast

    • 51
    • 73

    Increasing Clouds

    • 52
    • 78

    Mostly Sunny

    • 53
    • 78

    Mostly Sunny

    • 53
    • 79

    Mostly Sunny

    • 53
    • 80

    Mostly Sunny

    • 53
    • 79

    Mostly Sunny

    • 54
    • 79

    Mostly Sunny

Today 20 Jun North Bay Interior Valleys

Sunny. Highs in the mid 60s to upper 70s. Southwest Winds 10 to 20 Mph.

Tonight 20 Jun North Bay Interior Valleys

Mostly clear in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the upper 40s to mid 50s. Southwest Winds 5 to 15 Mph.

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Petaluma River - Black John Slough Entrance Temperature Statistics

June Temperature

Novato / Gnoss Field (1.9 miles)

  • Lowest 7 June, 2026

    46.4 °F

  • Average June

    65.9 °F

  • Highest 11 June, 2026

    100.4 °F

Climate (2021–2026)

Novato / Gnoss Field (1.9 miles)

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  • Average Low 2021–2026

    46.8 °F

  • Average 2021–2026

    57.7 °F

  • Average High 2021–2026

    72.5 °F
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