Diablo Lake Weather Forecast

    • 46
    • 68

    Increasing Clouds

    • 46
    • 64

    Mostly Cloudy

    • 47
    • 69

    Mostly Sunny

    • 51
    • 76

    Partly Sunny

    • 48
    • 68

    Chance Rain

    • 46
    • 64

    Chance Rain

Today 9 May Foothills and Valleys of the North Cascades

Mostly sunny. Highs in the upper 60s to mid 70s. Light wind.

Tonight 9 May Foothills and Valleys of the North Cascades

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid to upper 40s. Light wind.

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Diablo Lake Temperature Statistics

May Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 1 May, 2026

    46 °F

  • Average May

    59.7 °F

  • Highest 4 May, 2026

    79 °F

Climate (2021–Present)

Arlington Municipal Airport (60.9 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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