Robert Louis Stevenson State Park Weather Forecast

    • 51
    • 65

    Increasing Clouds

    • 54
    • 64

    Partly Sunny

    • 62
    • 73

    Sunny

    • 62
    • 76

    Mostly Sunny

    • 61
    • 73

    Mostly Sunny

    • 65
    • 76

    Mostly Sunny

Today 16 Sep North Bay Interior Mountains

Sunny. Highs in the 60s to mid 70s. Southwest Winds 5 to 10 Mph.

Tonight 16 Sep North Bay Interior Mountains

Partly cloudy in the evening then becoming mostly cloudy. Lows in the 50s. Southwest 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 5 September, 2026

    46.7 °F

  • Average September

    68 °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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