Marblemount Weather Forecast

    • 53
    • 78

    Mostly Cloudy

    • 52
    • 78

    Mostly Cloudy

    • 50
    • 79

    Mostly Sunny

    • 54
    • 85

    Sunny

    • 57
    • 94

    Sunny

    • 57
    • 94

    Sunny

Today 18 Aug Foothills and Valleys of the North Cascades

Mostly cloudy in the morning then becoming mostly sunny. Highs in the 70s. Light wind.

Tonight 18 Aug Foothills and Valleys of the North Cascades

Mostly cloudy. Lows in the mid to upper 50s. Light wind.

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Marblemount Temperature Statistics

August Temperature

Arlington Municipal Airport (41 miles)

  • Lowest 8 August, 2025

    46.9 °F

  • Average August

    65.9 °F

  • Highest 12 August, 2025

    93 °F

Climate (2020–Present)

Arlington Municipal Airport (41 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    50.5 °F

  • Average High 2020–2025

    59.7 °F
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