Clearlake Weather Forecast

    • 57
    • 90

    Increasing Clouds

    • 54
    • 89

    Partly Sunny

    • 50
    • 80

    Mostly Sunny

    • 48
    • 80

    Partly Sunny

    • 49
    • 78

    Mostly Sunny

    • 51
    • 82

    Mostly Sunny

Today 23 Sep Eastern Lake

Sunny. Highs 83 to 93. North wind around 10 Mph shifting to the southeast in the afternoon.

Tonight 23 Sep Eastern Lake

Partly cloudy. Lows 56 to 66. West wind around 5 Mph.

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Clearlake Temperature Statistics

September Temperature

Ukiah Municipal Airport (32.9 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    68.6 °F

  • Highest 10 September, 2026

    100.7 °F

Climate (2021–2026)

Ukiah Municipal Airport (32.9 miles)

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  • Average Low 2021–2026

    47.1 °F

  • Average 2021–2026

    61 °F

  • Average High 2021–2026

    76.1 °F
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