Mount St Helens Weather Forecast

    • 35
    • 45

    Breezy

    • 46
    • 54

    Mostly Sunny

    • 45
    • 59

    Chance Rain

    • 39
    • 47

    Chance Rain/Snow

    • 34
    • 43

    Chance Rain/Snow

    • 33
    • 40

    Chance Snow

Today 10 May South Washington Cascades

Mostly cloudy this Morning, then becoming partly sunny. Free air freezing level 12000 Feet, decreasing to free air freezing level 11000 feet this afternoon. West wind 15 to 20 Mph.

Tonight 10 May South Washington Cascades

Partly cloudy. Free air freezing level 10000 Feet, increasing to free air freezing level 12000 feet after midnight. Northwest wind 15 to 20 Mph, becoming light after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount St Helens Temperature Statistics

May Temperature

Southwest Washington Regional Airport (33.6 miles)

  • Lowest 8 May, 2026

    48.9 °F

  • Average May

    62.1 °F

  • Highest 3 May, 2026

    91 °F

Climate (2021–Present)

Southwest Washington Regional Airport (33.6 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.1 °F

  • Average High 2021–2026

    62.5 °F
Get WillyWeather+ to remove ads