Lost Lake Weather Forecast

    • 41
    • 50

    Rain Showers

    • 37
    • 46

    Rain Showers

    • 40
    • 50

    Partly Sunny

    • 44
    • 52

    Slight Chance Rain Showers

    • 40
    • 52

    Partly Sunny

    • 44
    • 55

    Mostly Sunny

    • 46
    • 58

    Partly Sunny

Today 28 Sep Western Chelan County

Sunny. Highs in the lower 60s to lower 70s.

Tonight 28 Sep Western Chelan County

Mostly cloudy. Rain Showers overnight. Lows in the 40s. Gusts up to 25 Mph. Chance of precipitation 90 percent. Rainfall Amounts less than a quarter of an inch.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lost Lake Temperature Statistics

September Temperature

Stampede Pass (41.6 miles)

  • Lowest 3 September, 2026

    39.9 °F

  • Average September

    51.7 °F

  • Highest 20 September, 2026

    73 °F

Climate (2021–2026)

Stampede Pass (41.6 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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