St. Helens Weather Forecast

    • 33
    • 48

    Partly Sunny

    • 34
    • 48

    Mostly Cloudy

    • 41
    • 46

    Rain

    • 41
    • 49

    Rain

    • 41
    • 48

    Rain Likely

    • 41
    • 48

    Rain Likely

Today 30 Dec Cowlitz County Lowlands

Widespread frost in the morning. Mostly sunny. Highs in the upper 40s. Winds light.

Tonight 30 Dec Cowlitz County Lowlands

Mostly clear in the Evening, then becoming partly cloudy. Areas of frost in the evening. Widespread frost after midnight. Lows in the lower 30s. Winds light.

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St. Helens Temperature Statistics

December Temperature

Southwest Washington Regional Airport (2.5 miles)

  • Lowest 1 December, 2025

    35.1 °F

  • Average December

    47.2 °F

  • Highest 15 December, 2025

    60.1 °F

Climate (2020–Present)

Southwest Washington Regional Airport (2.5 miles)

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  • Average Low 2020–2025

    45.2 °F

  • Average 2020–2025

    53 °F

  • Average High 2020–2025

    62.4 °F
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