Sugarloaf Ridge State Park Weather Forecast

    • 57
    • 82

    Sunny

    • 54
    • 76

    Mostly Sunny

    • 53
    • 70

    Mostly Sunny

    • 51
    • 69

    Mostly Sunny

    • 52
    • 67

    Partly Sunny

    • 56
    • 70

    Mostly Sunny

    • 56
    • 74

    Mostly Sunny

Today 21 May North Bay Interior Mountains

Sunny. Highs in the mid 70s to upper 80s. Southwest Winds 5 to 10 Mph.

Tonight 21 May North Bay Interior Mountains

Clear. Lows in the mid 50s to lower 60s. West Winds 5 to 10 Mph.

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Sugarloaf Ridge State Park Temperature Statistics

May Temperature

Petaluma Municipal Airport (13.7 miles)

  • Lowest 4 May, 2026

    42.8 °F

  • Average May

    58.3 °F

  • Highest 19 May, 2026

    87.8 °F

Climate (2021–Present)

Petaluma Municipal Airport (13.7 miles)

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  • Average Low 2021–2026

    44.8 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    68.6 °F
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