Diablo Lake Weather Forecast

    • 62
    • 84

    Mostly Sunny

    • 67
    • 89

    Mostly Cloudy

    • 57
    • 76

    Rain Showers Likely

    • 55
    • 65

    Chance Rain

    • 58
    • 77

    Mostly Sunny

    • 57
    • 76

    Partly Sunny

Today 20 Aug Foothills and Valleys of the North Cascades

Sunny. Highs in the 80s. Light wind becoming west around 10 Mph in the afternoon.

Tonight 20 Aug Foothills and Valleys of the North Cascades

Mostly clear. Lows in the mid to upper 50s. Northwest wind around 10 Mph becoming north after midnight.

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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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