Robert Louis Stevenson State Park Weather Forecast

    • 77
    • 87

    Mostly Sunny

    • 70
    • 85

    Mostly Sunny

    • 58
    • 78

    Sunny

    • 55
    • 66

    Mostly Sunny

    • 60
    • 70

    Sunny

    • 58
    • 71

    Sunny

Today 9 Sep North Bay Interior Mountains

Sunny. Highs in the 90s. North Winds up to 5 Mph. Becoming west in the afternoon.

Tonight 9 Sep North Bay Interior Mountains

Mostly clear. Lows in the lower 70s. Northwest Winds up to 5 Mph.

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Robert Louis Stevenson State Park Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (14.9 miles)

  • Lowest 5 September, 2026

    46.7 °F

  • Average September

    64.7 °F

  • Highest 7 September, 2026

    88 °F

Climate (2021–2026)

Santa Rosa, Santa Rosa Sonoma County Airport (14.9 miles)

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    58.7 °F

  • Average High 2021–2026

    72.8 °F
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