Clearlake Weather Forecast

    • 39
    • 62

    Becoming Sunny

    • 38
    • 63

    Sunny

    • 45
    • 66

    Sunny

    • 46
    • 69

    Sunny

    • 45
    • 71

    Sunny

    • 46
    • 68

    Mostly Sunny

Today 11 Jan Southern Lake County

Partly cloudy. Highs 56 to 66.

Tonight 11 Jan Southern Lake County

Mostly clear. Lows 38 to 48.

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Clearlake Temperature Statistics

January Temperature

Ukiah Municipal Airport (32.9 miles)

  • Lowest 8 January, 2026

    35.1 °F

  • Average January

    50 °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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