Diablo Lake Weather Forecast

    • 52
    • 75

    Sunny

    • 52
    • 78

    Sunny

    • 52
    • 75

    Mostly Sunny

    • 53
    • 74

    Mostly Sunny

    • 53
    • 76

    Partly Sunny

    • 51
    • 71

    Partly Sunny

    • 50
    • 68

    Partly Sunny

Today 16 Sep Foothills and Valleys of the North Cascades

Partly sunny. A slight chance of rain in the afternoon. Highs near 70.

Tonight 16 Sep Foothills and Valleys of the North Cascades

Mostly clear. Lows in the upper 40s to mid 50s. Light wind.

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Diablo Lake Temperature Statistics

September Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 8 September, 2026

    46 °F

  • Average September

    60.1 °F

  • Highest 9 September, 2026

    78.1 °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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