Diablo Lake Weather Forecast

    • 56
    • 70

    Becoming Sunny

    • 58
    • 80

    Sunny

    • 57
    • 77

    Mostly Sunny

    • 57
    • 76

    Mostly Sunny

    • 60
    • 80

    Mostly Sunny

    • 56
    • 75

    Chance Rain

Today 15 Sep Foothills and Valleys of the North Cascades

Partly sunny until late afternoon then becoming sunny. Highs in the upper 60s to mid 70s. Light wind.

Tonight 15 Sep Foothills and Valleys of the North Cascades

Mostly clear. Haze after midnight. Lows in the lower to mid 50s. Light wind becoming northeast to 10 Mph after midnight.

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Diablo Lake Temperature Statistics

September Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 9 September, 2025

    51.8 °F

  • Average September

    63.4 °F

  • Highest 3 September, 2025

    81 °F

Climate (2020–Present)

Arlington Municipal Airport (60.9 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    59.7 °F
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