Diablo Lake Weather Forecast

    • 55
    • 71

    Mostly Sunny

    • 58
    • 78

    Mostly Sunny

    • 65
    • 86

    Partly Sunny

    • 65
    • 86

    Partly Sunny

    • 65
    • 84

    Mostly Sunny

    • 63
    • 83

    Mostly Sunny

Today 18 Jul Foothills and Valleys of the North Cascades

Mostly sunny. Highs in the 70s. South wind to 10 Mph becoming west in the afternoon.

Tonight 18 Jul Foothills and Valleys of the North Cascades

Mostly clear. Lows in the lower to mid 50s. West wind to 10 Mph in the evening becoming light.

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Diablo Lake Temperature Statistics

July Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 13 July, 2026

    44.6 °F

  • Average July

    62.1 °F

  • Highest 6 July, 2026

    81 °F

Climate (2021–2026)

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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