Upper Granite Lake Weather Forecast

    • 47
    • 57

    Mostly Cloudy

    • 47
    • 57

    Mostly Cloudy

    • 45
    • 58

    Mostly Sunny

    • 50
    • 64

    Mostly Sunny

    • 54
    • 72

    Sunny

    • 54
    • 72

    Sunny

Today 18 Aug Cascades of Whatcom and Skagit Counties

Mostly cloudy in the Morning, then mostly sunny with a slight chance of rain in the afternoon. Snow level near 8000 feet.

Tonight 18 Aug Cascades of Whatcom and Skagit Counties

Mostly cloudy. Freezing level near 11500 feet.

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Upper Granite Lake Temperature Statistics

August Temperature

Arlington Municipal Airport (43.5 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 (43.5 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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