Clearlake Weather Forecast

    • 37
    • 62

    Mostly Sunny

    • 41
    • 67

    Mostly Sunny

    • 41
    • 64

    Partly Sunny

    • 41
    • 64

    Partly Sunny

    • 42
    • 66

    Partly Sunny

    • 45
    • 67

    Partly Sunny

Today 4 Dec Southern Lake County

Partly cloudy early in the morning then clearing. Highs 56 to 66.

Tonight 4 Dec Southern Lake County

Mostly clear. Lows 35 to 45.

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Clearlake Temperature Statistics

December Temperature

Ukiah Municipal Airport (32.9 miles)

  • Lowest 2 December, 2025

    35.1 °F

  • Average December

    46.8 °F

  • Highest 2 December, 2025

    64 °F

Climate (2020–Present)

Ukiah Municipal Airport (32.9 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    60.7 °F

  • Average High 2020–2025

    76 °F
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