Clearlake Weather Forecast

    • 55
    • 86

    Sunny

    • 56
    • 91

    Mostly Sunny

    • 56
    • 89

    Partly Sunny

    • 56
    • 91

    Mostly Sunny

    • 57
    • 93

    Mostly Sunny

    • 58
    • 93

    Mostly Sunny

Today 18 Sep Eastern Lake

Sunny. Highs 79 to 89. Northwest wind around 5 Mph.

Tonight 18 Sep Eastern Lake

Clear. Lows 54 to 64. Northwest wind around 10 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

    68.2 °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

    60.9 °F

  • Average High 2021–2026

    76 °F
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