Clearlake Weather Forecast

    • 34
    • 69

    Mostly Sunny

    • 35
    • 69

    Mostly Sunny

    • 43
    • 66

    Partly Sunny

    • 42
    • 65

    Partly Sunny

    • 40
    • 65

    Mostly Sunny

    • 40
    • 63

    Partly Sunny

    • 38
    • 60

    Partly Sunny

Today 18 Jan Southern Lake County

Partly cloudy. Highs 62 to 72.

Tonight 18 Jan Southern Lake County

Partly cloudy. Lows 37 to 47.

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Clearlake Temperature Statistics

January Temperature

Ukiah Municipal Airport (32.9 miles)

  • Lowest 9 January, 2026

    30 °F

  • Average January

    47.3 °F

  • Highest 15 January, 2026

    70 °F

Climate (2021–Present)

Ukiah Municipal Airport (32.9 miles)

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  • Average Low 2021–2026

    47 °F

  • Average 2021–2026

    60.7 °F

  • Average High 2021–2026

    76 °F
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