Surprise Lake Weather Forecast

    • 43
    • 59

    Sunny

    • 44
    • 64

    Mostly Sunny

    • 44
    • 58

    Mostly Sunny

    • 45
    • 60

    Partly Sunny

    • 46
    • 64

    Partly Sunny

    • 43
    • 57

    Partly Sunny

Today 16 Sep Cascades of Snohomish and Northern King Counties

Sunny. Freezing level near 11500 feet. Afternoon pass Temperatures in the mid 60s. Light wind.

Tonight 16 Sep Cascades of Snohomish and Northern King Counties

Clear. Freezing level near 13000 feet. Lows in the mid 40s. Light wind.

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Surprise Lake Temperature Statistics

September Temperature

Stampede Pass (28.6 miles)

  • Lowest 3 September, 2026

    39.9 °F

  • Average September

    50.2 °F

  • Highest 9 September, 2026

    71.1 °F

Climate (2021–2026)

Stampede Pass (28.6 miles)

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  • Average Low 2021–2026

    36.1 °F

  • Average 2021–2026

    41.5 °F

  • Average High 2021–2026

    48.2 °F
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