Petaluma River - Black John Slough Entrance Weather Forecast

    • 54
    • 83

    Becoming Sunny

    • 54
    • 84

    Partly Sunny

    • 55
    • 87

    Mostly Sunny

    • 56
    • 86

    Mostly Sunny

    • 57
    • 87

    Mostly Sunny

    • 55
    • 80

    Mostly Sunny

Today 5 Aug North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the upper 70s to lower 90s. Southwest Winds 5 to 15 Mph.

Tonight 5 Aug North Bay Interior Valleys

Mostly clear in the evening then becoming mostly cloudy. Areas of fog after midnight. Lows in the upper 40s to lower 60s. Southwest Winds 5 to 15 Mph.

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Petaluma River - Black John Slough Entrance Temperature Statistics

August Temperature

Novato / Gnoss Field (1.9 miles)

  • Lowest 1 August, 2026

    53.6 °F

  • Average August

    70 °F

  • Highest 2 August, 2026

    98.6 °F

Climate (2021–2026)

Novato / Gnoss Field (1.9 miles)

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  • Average Low 2021–2026

    46.9 °F

  • Average 2021–2026

    57.8 °F

  • Average High 2021–2026

    72.5 °F
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