Clearlake Highlands Weather Forecast

    • 61
    • 94

    Increasing Clouds

    • 59
    • 91

    Mostly Cloudy

    • 58
    • 81

    Slight Chance Rain Showers

    • 59
    • 86

    Mostly Sunny

    • 60
    • 90

    Mostly Sunny

    • 61
    • 96

    Chance Rain

    • 55
    • 82

    Chance Rain

Today 17 Sep Southern Lake County

Sunny. Highs 86 to 98.

Tonight 17 Sep Southern Lake County

Partly cloudy in the evening then becoming mostly cloudy. Lows 61 to 71.

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Clearlake Highlands Temperature Statistics

September Temperature

Ukiah Municipal Airport (31.7 miles)

  • Lowest 7 September, 2025

    50 °F

  • Average September

    69.6 °F

  • Highest 2 September, 2025

    102.9 °F

Climate (2020–Present)

Ukiah Municipal Airport (31.7 miles)

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  • Average Low 2020–2025

    46.8 °F

  • Average 2020–2025

    60.7 °F

  • Average High 2020–2025

    76.3 °F
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