Boulder Lake Weather Forecast

    • 36
    • 43

    Mostly Cloudy

    • 35
    • 47

    Partly Sunny

    • 39
    • 44

    Mostly Cloudy

    • 42
    • 51

    Partly Sunny

    • 43
    • 50

    Partly Sunny

    • 43
    • 55

    Partly Sunny

Today 17 May Cascades of Whatcom and Skagit Counties

Mostly sunny. Freezing level near 4500 feet increasing to 6000 feet in the afternoon.

Tonight 17 May Cascades of Whatcom and Skagit Counties

Partly cloudy with a slight chance of Showers in the Evening, then mostly cloudy after midnight. Snow level near 5500 feet. No snow accumulation.

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Boulder Lake Temperature Statistics

May Temperature

Arlington Municipal Airport (39.8 miles)

  • Lowest 12 May, 2026

    44.6 °F

  • Average May

    57.5 °F

  • Highest 12 May, 2026

    84 °F

Climate (2021–Present)

Arlington Municipal Airport (39.8 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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