Hidden Valley Lake Weather Forecast

    • 53
    • 88

    Sunny

    • 56
    • 86

    Sunny

    • 60
    • 93

    Sunny

    • 60
    • 94

    Sunny

    • 60
    • 95

    Mostly Sunny

    • 58
    • 93

    Mostly Sunny

Today 13 Sep Southern Lake County

Sunny. Highs 78 to 91.

Tonight 13 Sep Southern Lake County

Mostly clear. Lows 51 to 61.

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Hidden Valley Lake Temperature Statistics

September Temperature

Santa Rosa, Santa Rosa Sonoma County Airport (24.9 miles)

  • Lowest 7 September, 2025

    48.9 °F

  • Average September

    65.6 °F

  • Highest 1 September, 2025

    99 °F

Climate (2020–Present)

Santa Rosa, Santa Rosa Sonoma County Airport (24.9 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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