Clearlake Weather Forecast

    • 37
    • 58

    Mostly Cloudy

    • 43
    • 56

    Rain

    • 47
    • 53

    Rain

    • 42
    • 55

    Rain

    • 40
    • 52

    Rain

    • 40
    • 52

    Rain Likely

    • 38
    • 53

    Rain Likely

Today 30 Dec Southern Lake County

Sunny in the morning then becoming partly cloudy. Highs 54 to 64.

Tonight 30 Dec Southern Lake County

Mostly cloudy. Lows 38 to 48.

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Clearlake Temperature Statistics

December Temperature

Ukiah Municipal Airport (32.9 miles)

  • Lowest 13 December, 2025

    30 °F

  • Average December

    49.2 °F

  • Highest 10 December, 2025

    72 °F

Climate (2020–Present)

Ukiah Municipal Airport (32.9 miles)

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  • Average Low 2020–2025

    47.1 °F

  • Average 2020–2025

    60.8 °F

  • Average High 2020–2025

    76 °F
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