Robert Louis Stevenson State Park Weather Forecast

    • 71
    • 82

    Increasing Clouds

    • 66
    • 75

    Mostly Cloudy

    • 64
    • 69

    Slight Chance Rain Showers

    • 66
    • 72

    Mostly Sunny

    • 70
    • 77

    Sunny

    • 68
    • 80

    Partly Sunny

Today 17 Sep North Bay Interior Mountains

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

Tonight 17 Sep North Bay Interior Mountains

Partly cloudy. Lows in the 60s. West Winds 5 to 10 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 14 September, 2025

    48 °F

  • Average September

    65.3 °F

  • Highest 1 September, 2025

    99 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.3 °F

  • Average 2020–2025

    57.9 °F

  • Average High 2020–2025

    72.8 °F
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