Saint Helens Lake Weather Forecast

    • 46
    • 60

    Increasing Clouds

    • 48
    • 63

    Increasing Clouds

    • 47
    • 63

    Mostly Sunny

    • 54
    • 71

    Sunny

    • 57
    • 79

    Mostly Sunny

    • 53
    • 76

    Mostly Sunny

    • 51
    • 71

    Mostly Sunny

Today 18 Aug South Washington Cascades

Mostly sunny. Free air freezing level 12000 feet. Southwest wind 5 to 10 Mph.

Tonight 18 Aug South Washington Cascades

Mostly clear this Evening, then becoming partly cloudy. Free air freezing level 13000 feet. West wind 5 to 10 Mph.

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  • Temperature Real-Time

Saint Helens Lake Temperature Statistics

August Temperature

Southwest Washington Regional Airport (36.7 miles)

  • Lowest 8 August, 2025

    50 °F

  • Average August

    68.4 °F

  • Highest 12 August, 2025

    99 °F

Climate (2020–Present)

Southwest Washington Regional Airport (36.7 miles)

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  • Average Low 2020–2025

    45 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.2 °F
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