Mount St Helens Weather Forecast

    • 45
    • 57

    Mostly Sunny

    • 47
    • 57

    Mostly Sunny

    • 46
    • 52

    Partly Sunny

    • 49
    • 57

    Mostly Sunny

    • 51
    • 61

    Partly Sunny

    • 51
    • 61

    Partly Sunny

    • 50
    • 60

    Mostly Cloudy

Today 10 Aug South Washington Cascades

Sunny. Free air freezing level 14000 feet. Northwest wind 5 to 10 Mph.

Tonight 10 Aug South Washington Cascades

Mostly clear. Free air freezing level 15000 feet. Northwest wind 5 to 10 Mph.

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Mount St Helens Temperature Statistics

August Temperature

Southwest Washington Regional Airport (33.6 miles)

  • Lowest 4 August, 2026

    55 °F

  • Average August

    71 °F

  • Highest 5 August, 2026

    93.9 °F

Climate (2021–2026)

Southwest Washington Regional Airport (33.6 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.1 °F

  • Average High 2021–2026

    62.5 °F
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