Castle Rock Springs Weather Forecast

    • 70
    • 81

    Sunny

    • 72
    • 84

    Mostly Sunny

    • 65
    • 78

    Partly Sunny

    • 64
    • 69

    Partly Sunny

    • 66
    • 73

    Mostly Sunny

    • 70
    • 78

    Sunny

Today 16 Sep Southern Lake County

Sunny. Highs 85 to 96.

Tonight 16 Sep Southern Lake County

Clear. Lows 60 to 70.

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Castle Rock Springs Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (19.3 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 (19.3 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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