Mount St Helens Weather Forecast

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    • 46

    Increasing Clouds

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    • 37

    Rain

    • 35
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    Snow

    • 25
    • 37

    Blizzard

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    Snow

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    Snow

Today 13 Dec South Washington Cascades

Sunny. Free air freezing level 12000 Feet, decreasing to free air freezing level 11000 feet in the afternoon. Winds light.

Tonight 13 Dec South Washington Cascades

Mostly cloudy. Rain after midnight. Snow level 6000 feet. Southeast wind 5 to 10 Mph, becoming south after midnight. Chance of rain 90 percent. Rainfall Amounts less than a tenth of an inch.

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Mount St Helens Temperature Statistics

December Temperature

Southwest Washington Regional Airport (33.6 miles)

  • Lowest 1 December, 2025

    35.1 °F

  • Average December

    48.4 °F

  • Highest 10 December, 2025

    57.9 °F

Climate (2020–Present)

Southwest Washington Regional Airport (33.6 miles)

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  • Average Low 2020–2025

    45.1 °F

  • Average 2020–2025

    52.9 °F

  • Average High 2020–2025

    62.4 °F
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