Alta Lake Weather Forecast

    • 56
    • 79

    Mostly Sunny

    • 56
    • 80

    Partly Sunny

    • 57
    • 80

    Mostly Sunny

    • 55
    • 81

    Partly Sunny

    • 53
    • 77

    Partly Sunny

    • 53
    • 73

    Mostly Cloudy

Today 18 Sep Okanogan Valley

Sunny. Highs in the lower 70s to lower 80s.

Tonight 18 Sep Okanogan Valley

Mostly clear. Lows in the lower to mid 50s.

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Alta Lake Temperature Statistics

September Temperature

Omak Airport (36 miles)

  • Lowest 14 September, 2026

    44.7 °F

  • Average September

    63.6 °F

  • Highest 10 September, 2026

    85.6 °F

Climate (2021–2026)

Omak Airport (36 miles)

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  • Average Low 2021–2026

    40.7 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    62.9 °F
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