Thornton Lake Weather Forecast

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    • 39

    Rain/Snow

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    • 42

    Rain

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    Rain/Snow

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    Chance Rain

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    Rain/Snow Likely

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    Chance Rain/Snow

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    Slight Chance Rain

Today 15 May 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 4500 feet. Afternoon pass Temperatures in the lower 40s. Light wind.

Tonight 15 May Cascades of Snohomish and Northern King Counties

Cloudy with rain and snow likely in the Evening, then cloudy with a chance of rain and snow after midnight. Snow level near 4500 feet. Rainfall Amounts a tenth to a quarter of an inch possible. No snow accumulation. Lows in the mid 30s. Light wind.

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Thornton Lake Temperature Statistics

May Temperature

Arlington Municipal Airport (34.8 miles)

  • Lowest 5 May, 2025

    36 °F

  • Average May

    54.4 °F

  • Highest 6 May, 2025

    77 °F

Climate (2020–Present)

Arlington Municipal Airport (34.8 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    50.5 °F

  • Average High 2020–2025

    59.5 °F
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