Diablo Lake Weather Forecast

    • 48
    • 68

    Increasing Clouds

    • 53
    • 67

    Slight Chance Rain

    • 50
    • 70

    Rain Likely

    • 49
    • 64

    Rain Likely

    • 50
    • 67

    Partly Sunny

    • 51
    • 72

    Mostly Sunny

    • 54
    • 77

    Mostly Sunny

Today 10 Sep Foothills and Valleys of the North Cascades

Partly sunny. Highs in the upper 60s to mid 70s. Light wind.

Tonight 10 Sep Foothills and Valleys of the North Cascades

Partly cloudy. Lows near 50. Light wind.

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  • Temperature Real-Time

Diablo Lake Temperature Statistics

September Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 8 September, 2026

    46 °F

  • Average September

    60.2 °F

  • Highest 8 September, 2026

    73.9 °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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