Petaluma River - Black John Slough Entrance Weather Forecast

    • 48
    • 72

    Increasing Clouds

    • 48
    • 72

    Partly Sunny

    • 49
    • 75

    Mostly Sunny

    • 50
    • 79

    Mostly Sunny

    • 51
    • 81

    Mostly Sunny

    • 53
    • 87

    Partly Sunny

Today 6 May North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the mid 60s to lower 80s. West Winds up to 5 Mph increasing to southwest 10 to 20 Mph in the afternoon.

Tonight 6 May North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the 40s to mid 50s. Southwest Winds 10 to 20 Mph. Becoming 5 to 10 Mph after midnight.

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  • Temperature Real-Time

Petaluma River - Black John Slough Entrance Temperature Statistics

May Temperature

Novato / Gnoss Field (1.9 miles)

  • Lowest 4 May, 2026

    46.4 °F

  • Average May

    57.6 °F

  • Highest 1 May, 2026

    73.4 °F

Climate (2021–Present)

Novato / Gnoss Field (1.9 miles)

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  • Average Low 2021–2026

    46.7 °F

  • Average 2021–2026

    57.7 °F

  • Average High 2021–2026

    72.5 °F
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