Diablo Lake Weather Forecast

    • 41
    • 60

    Mostly Cloudy

    • 46
    • 66

    Partly Sunny

    • 47
    • 71

    Partly Sunny

    • 46
    • 67

    Chance Rain

    • 42
    • 58

    Chance Rain

    • 40
    • 58

    Slight Chance Rain

Today 18 Apr Foothills and Valleys of the North Cascades

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

Tonight 18 Apr Foothills and Valleys of the North Cascades

Partly cloudy. Lows in the mid to upper 40s. Light wind.

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Diablo Lake Temperature Statistics

April Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 8 April, 2026

    30 °F

  • Average April

    48.6 °F

  • Highest 6 April, 2026

    69.1 °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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