Diablo Lake Weather Forecast

    • 45
    • 56

    Rain

    • 47
    • 60

    Partly Sunny

    • 51
    • 63

    Chance Rain

    • 47
    • 64

    Partly Sunny

    • 50
    • 70

    Partly Sunny

    • 52
    • 71

    Partly Sunny

Today 29 Sep Foothills and Valleys of the North Cascades

Rain. Rainfall Amounts one to three Inches possible. Highs in the mid 50s to lower 60s. South wind 10 to 15 Mph with Gusts to 25 Mph becoming southwest in the afternoon.

Tonight 29 Sep Foothills and Valleys of the North Cascades

Mostly cloudy. A chance of rain in the evening. Patchy fog in the evening. Patchy fog in the morning. Lows in the mid to upper 40s. South wind to 10 Mph in the evening becoming light.

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Diablo Lake Temperature Statistics

September Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 26 September, 2026

    42.1 °F

  • Average September

    58.3 °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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