Upper Lake Weather Forecast

    • 48
    • 77

    Becoming Sunny

    • 52
    • 86

    Sunny

    • 54
    • 93

    Mostly Sunny

    • 54
    • 90

    Partly Sunny

    • 55
    • 93

    Mostly Sunny

    • 53
    • 91

    Mostly Sunny

Today 17 Sep Western Lake

Mostly sunny. Patchy fog in the morning. Highs 70 to 80. South wind around 5 Mph.

Tonight 17 Sep Western Lake

Mostly clear. Lows 49 to 59. West wind around 5 Mph shifting to the northwest overnight.

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Upper Lake Temperature Statistics

September Temperature

Ukiah Municipal Airport (15.5 miles)

  • Lowest 6 September, 2026

    45.6 °F

  • Average September

    68.4 °F

  • Highest 10 September, 2026

    100.7 °F

Climate (2021–2026)

Ukiah Municipal Airport (15.5 miles)

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  • Average Low 2021–2026

    47.1 °F

  • Average 2021–2026

    60.9 °F

  • Average High 2021–2026

    76.1 °F
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