Thornton Lake Weather Forecast

    • 26
    • 33

    Chance Snow

    • 28
    • 34

    Partly Sunny

    • 30
    • 33

    Snow

    • 25
    • 32

    Slight Chance Snow

    • 29
    • 34

    Chance Snow

    • 33
    • 34

    Rain Likely

Today 29 Nov Cascades of Snohomish and Northern King Counties

Mostly cloudy. A slight chance of rain and snow early in the afternoon. A chance of rain and snow late in the afternoon. Snow level near 2500 feet. Afternoon pass Temperatures in the upper 20s. Light wind.

Tonight 29 Nov Cascades of Snohomish and Northern King Counties

Partly cloudy with a slight chance of rain and snow in the Evening, then mostly clear after midnight. Snow level near 2000 feet. Freezing level near 2500 feet after midnight. Lows around 17. Light wind.

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Thornton Lake Temperature Statistics

November Temperature

Arlington Municipal Airport (34.8 miles)

  • Lowest 4 November, 2025

    30.9 °F

  • Average November

    47.4 °F

  • Highest 1 November, 2025

    61 °F

Climate (2020–Present)

Arlington Municipal Airport (34.8 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    59.8 °F
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