Diablo Lake Weather Forecast

    • 53
    • 75

    Becoming Sunny

    • 54
    • 78

    Mostly Sunny

    • 52
    • 74

    Partly Sunny

    • 48
    • 68

    Partly Sunny

    • 48
    • 63

    Partly Sunny

    • 48
    • 62

    Chance Rain

    • 45
    • 60

    Chance Rain

Today 19 Sep Foothills and Valleys of the North Cascades

Partly sunny. A slight chance of rain in the morning. Highs in the mid to upper 60s.

Tonight 19 Sep Foothills and Valleys of the North Cascades

Mostly clear. Lows near 50. Light wind.

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Diablo Lake Temperature Statistics

September Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 16 September, 2026

    44.1 °F

  • Average September

    59.9 °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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