Diamond Lake Weather Forecast

    • 26
    • 38

    Decreasing Clouds

    • 26
    • 38

    Mostly Sunny

    • 35
    • 41

    Mostly Cloudy

    • 35
    • 40

    Mostly Cloudy

    • 35
    • 40

    Chance Snow

    • 33
    • 37

    Snow Likely

Today 31 Oct Cascades of Snohomish and Northern King Counties

Mostly sunny. Freezing level near 4000 feet increasing to 6000 feet in the afternoon. Afternoon pass Temperatures around 40. Light wind.

Tonight 31 Oct Cascades of Snohomish and Northern King Counties

Mostly cloudy in the evening then becoming mostly clear. Freezing level near 6000 feet. Lows around 30. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diamond Lake Temperature Statistics

October Temperature

Arlington Municipal Airport (41.6 miles)

  • Lowest 12 October, 2026

    32 °F

  • Average October

    51.1 °F

  • Highest 16 October, 2026

    78.1 °F

Climate (2021–2026)

Arlington Municipal Airport (41.6 miles)

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  • Average Low 2021–2026

    42.5 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    60 °F
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