Isolation Lake Weather Forecast

    • 57
    • 66

    Partly Sunny

    • 56
    • 66

    Slight Chance Thunderstorms

    • 51
    • 61

    Slight Chance Thunderstorms

    • 50
    • 56

    Slight Chance Thunderstorms

    • 49
    • 56

    Partly Sunny

    • 46
    • 53

    Partly Sunny

Today 25 Aug Western Chelan County

Sunny. Highs 92 to 102.

Tonight 25 Aug Western Chelan County

Partly cloudy. A chance of rain Showers in the evening. Lows in the mid 60s to mid 70s. Chance of precipitation 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Isolation Lake Temperature Statistics

August Temperature

Stampede Pass (28 miles)

  • Lowest 8 August, 2025

    43 °F

  • Average August

    57.7 °F

  • Highest 11 August, 2025

    84 °F

Climate (2020–Present)

Stampede Pass (28 miles)

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  • Average Low 2020–2025

    36.2 °F

  • Average 2020–2025

    41.5 °F

  • Average High 2020–2025

    48.3 °F
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