Island Lake Weather Forecast

    • 54
    • 61

    Slight Chance Thunderstorms

    • 53
    • 63

    Rain Likely

    • 54
    • 57

    Rain Likely

    • 55
    • 61

    Chance Rain

    • 56
    • 62

    Slight Chance Rain

    • 56
    • 63

    Slight Chance Rain

    • 55
    • 66

    Rain Likely

Today 7 Sep Cascades of Snohomish and Northern King Counties

Mostly cloudy. Areas of smoke in the morning. A slight chance of Showers in the Morning, then a chance of Showers in the afternoon. A slight chance of Thunderstorms in the afternoon. Snow level near 11000 feet. Afternoon pass Temperatures in the mid 60s. Light wind.

Tonight 7 Sep Cascades of Snohomish and Northern King Counties

Mostly cloudy with a slight chance of rain. Snow level near 10500 feet. Lows in the upper 40s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Island Lake Temperature Statistics

September Temperature

Stampede Pass (53.4 miles)

  • Lowest 1 September, 2025

    54 °F

  • Average September

    68.9 °F

  • Highest 2 September, 2025

    87.1 °F

Climate (2020–Present)

Stampede Pass (53.4 miles)

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  • Average Low 2020–2025

    36.3 °F

  • Average 2020–2025

    41.6 °F

  • Average High 2020–2025

    48.4 °F
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