Robert Louis Stevenson State Park Weather Forecast

    • 67
    • 80

    Sunny

    • 67
    • 79

    Mostly Sunny

    • 70
    • 78

    Mostly Cloudy

    • 69
    • 81

    Mostly Sunny

    • 69
    • 79

    Mostly Sunny

    • 68
    • 79

    Sunny

Today 30 Sep North Bay Interior Mountains

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

Tonight 30 Sep North Bay Interior Mountains

Clear. Lows in the lower to mid 60s. Southwest Winds up to 5 Mph in the evening. Becoming light.

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Robert Louis Stevenson State Park Temperature Statistics

September Temperature

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

  • Lowest 26 September, 2026

    44.7 °F

  • Average September

    66.7 °F

  • Highest 10 September, 2026

    101.6 °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

    72.9 °F
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