Larch Lake Weather Forecast

    • 54
    • 66

    Slight Chance Thunderstorms

    • 58
    • 71

    Mostly Sunny

    • 56
    • 72

    Partly Sunny

    • 56
    • 71

    Partly Sunny

    • 57
    • 72

    Mostly Cloudy

    • 56
    • 71

    Mostly Cloudy

    • 54
    • 67

    Mostly Cloudy

Today 12 Aug Foothills and Valleys of the North Cascades

Mostly sunny. A slight chance of Thunderstorms late in the afternoon. Highs in the 70s to lower 80s. Light wind.

Tonight 12 Aug Foothills and Valleys of the North Cascades

Partly cloudy. A chance of Showers and a slight chance of Thunderstorms in the Evening, then a slight chance of Showers late in the evening. Lows in the lower to mid 50s. Light wind.

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Larch Lake Temperature Statistics

August Temperature

Arlington Municipal Airport (16.2 miles)

  • Lowest 3 August, 2026

    46.4 °F

  • Average August

    64.1 °F

  • Highest 6 August, 2026

    84.9 °F

Climate (2021–2026)

Arlington Municipal Airport (16.2 miles)

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  • Average Low 2021–2026

    42.6 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    59.9 °F
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