Olallie Lake Weather Forecast

    • 45
    • 63

    Increasing Clouds

    • 41
    • 51

    Mostly Cloudy

    • 42
    • 51

    Mostly Cloudy

    • 40
    • 52

    Rain Likely

    • 38
    • 43

    Rain Likely

    • 39
    • 48

    Mostly Cloudy

    • 39
    • 48

    Partly Sunny

Today 21 Sep Cascades of Southern King County

Mostly cloudy with a chance of rain. Snow level near 7000 feet.

Tonight 21 Sep Cascades of Southern King County

Mostly cloudy then becoming partly cloudy late in the evening then becoming mostly cloudy. Freezing level near 12500 feet. Light wind in the Passes.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Olallie Lake Temperature Statistics

September Temperature

Stampede Pass (12.4 miles)

  • Lowest 3 September, 2026

    39.9 °F

  • Average September

    50.8 °F

  • Highest 9 September, 2026

    71.1 °F

Climate (2021–2026)

Stampede Pass (12.4 miles)

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  • Average Low 2021–2026

    36.2 °F

  • Average 2021–2026

    41.5 °F

  • Average High 2021–2026

    48.2 °F
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