Diamond Lake Weather Forecast

    • 48
    • 61

    Increasing Clouds

    • 40
    • 53

    Mostly Cloudy

    • 44
    • 51

    Mostly Cloudy

    • 41
    • 52

    Chance Rain

    • 39
    • 48

    Slight Chance Rain

    • 41
    • 53

    Partly Sunny

    • 41
    • 55

    Partly Sunny

Today 9 Sep Cascades of Snohomish and Northern King Counties

Sunny until late afternoon then becoming partly sunny. Freezing level near 14500 feet. Afternoon pass Temperatures around 70. Light wind.

Tonight 9 Sep Cascades of Snohomish and Northern King Counties

Mostly cloudy. Freezing level near 14500 feet. Lows in the upper 40s. Light wind.

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Diamond Lake Temperature Statistics

September Temperature

Arlington Municipal Airport (41.6 miles)

  • Lowest 6 September, 2026

    46.9 °F

  • Average September

    60.2 °F

  • Highest 4 September, 2026

    73 °F

Climate (2021–2026)

Arlington Municipal Airport (41.6 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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