Diablo Lake Weather Forecast

    • 50
    • 62

    Partly Sunny

    • 52
    • 74

    Mostly Sunny

    • 56
    • 75

    Partly Sunny

    • 48
    • 68

    Partly Sunny

    • 49
    • 63

    Chance Rain

    • 48
    • 63

    Chance Rain

    • 49
    • 68

    Mostly Sunny

Today 7 Sep Foothills and Valleys of the North Cascades

Mostly cloudy. A chance of rain in the Morning, then a slight chance of rain early in the afternoon. Highs in the mid 60s to lower 70s. South wind to 10 Mph with Gusts to 20 Mph in the morning becoming light.

Tonight 7 Sep Foothills and Valleys of the North Cascades

Mostly cloudy in the evening then becoming partly cloudy. Lows near 50. Light wind.

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Diablo Lake Temperature Statistics

September Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 5 September, 2026

    48.9 °F

  • Average September

    60.7 °F

  • Highest 4 September, 2026

    73 °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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