Diablo Lake Weather Forecast

    • 58
    • 75

    Chance Thunderstorms

    • 59
    • 77

    Partly Sunny

    • 58
    • 77

    Partly Sunny

    • 58
    • 77

    Partly Sunny

    • 57
    • 72

    Partly Sunny

    • 57
    • 73

    Partly Sunny

Today 14 Aug Foothills and Valleys of the North Cascades

Sunny. A slight chance of Thunderstorms in the afternoon. Highs in the mid 70s to lower 80s. Light wind.

Tonight 14 Aug Foothills and Valleys of the North Cascades

Mostly clear. A slight chance of Showers in the evening. Lows in the mid to upper 50s. Light wind.

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Diablo Lake Temperature Statistics

August Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 3 August, 2026

    46.4 °F

  • Average August

    64.2 °F

  • Highest 6 August, 2026

    84.9 °F

Climate (2021–2026)

Arlington Municipal Airport (60.9 miles)

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  • Average Low 2021–2026

    42.5 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    59.8 °F
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