Thornton Lake Weather Forecast

    • 34
    • 43

    Mostly Sunny

    • 33
    • 43

    Sunny

    • 34
    • 46

    Sunny

    • 32
    • 46

    Sunny

    • 33
    • 45

    Partly Sunny

    • 30
    • 42

    Partly Sunny

Today 15 Jan Cascades of Snohomish and Northern King Counties

Sunny. Patchy dense fog until late afternoon. Freezing level near 10500 feet. Afternoon pass Temperatures in the lower 40s. Light wind.

Tonight 15 Jan Cascades of Snohomish and Northern King Counties

Mostly clear. Freezing level near 10000 feet. Lows in the upper 20s. Light wind.

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Thornton Lake Temperature Statistics

January Temperature

Arlington Municipal Airport (34.8 miles)

  • Lowest 1 January, 2026

    26.6 °F

  • Average January

    43.8 °F

  • Highest 12 January, 2026

    57 °F

Climate (2021–Present)

Arlington Municipal Airport (34.8 miles)

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  • Average Low 2021–2026

    42.5 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    59.8 °F
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