Clearlake Weather Forecast

    • 34
    • 57

    Partly Sunny

    • 37
    • 56

    Mostly Cloudy

    • 38
    • 62

    Mostly Sunny

    • 42
    • 64

    Mostly Sunny

    • 46
    • 68

    Mostly Sunny

    • 47
    • 70

    Sunny

    • 47
    • 70

    Sunny

Today 9 Jan Southern Lake County

Sunny. Highs 50 to 60.

Tonight 9 Jan Southern Lake County

Partly cloudy. Haze overnight. Lows 32 to 42.

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Clearlake Temperature Statistics

January Temperature

Ukiah Municipal Airport (32.9 miles)

  • Lowest 7 January, 2026

    44.1 °F

  • Average January

    51 °F

  • Highest 6 January, 2026

    57.9 °F

Climate (2021–Present)

Ukiah Municipal Airport (32.9 miles)

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  • Average Low 2021–2026

    47.1 °F

  • Average 2021–2026

    60.8 °F

  • Average High 2021–2026

    76 °F
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