Sugarloaf Ridge State Park Weather Forecast

    • 66
    • 88

    Sunny

    • 65
    • 89

    Sunny

    • 64
    • 89

    Mostly Sunny

    • 62
    • 81

    Partly Sunny

    • 60
    • 79

    Mostly Sunny

    • 59
    • 77

    Mostly Sunny

Today 15 Sep North Bay Interior Mountains

Sunny. Highs in the 80s to lower 90s. North Winds 5 to 10 Mph. Becoming southwest in the afternoon.

Tonight 15 Sep North Bay Interior Mountains

Clear. Lows in the upper 60s. Light Winds.

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Sugarloaf Ridge State Park Temperature Statistics

September Temperature

Petaluma Municipal Airport (13.7 miles)

  • Lowest 7 September, 2025

    50 °F

  • Average September

    62.8 °F

  • Highest 1 September, 2025

    93.2 °F

Climate (2020–Present)

Petaluma Municipal Airport (13.7 miles)

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  • Average Low 2020–2025

    44.4 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    69.1 °F
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