Twin Sisters Lake Weather Forecast

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    Rain Showers

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    Chance Rain Showers

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    Chance Rain Showers

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    Partly Sunny

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    Chance Rain Showers

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    Chance Rain Showers

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    Chance Rain Showers

Today 9 Sep Upper Slopes of the Eastern Washington Cascades Crest

Mostly cloudy. A chance of Showers and Thunderstorms. Highs in the lower 60s to lower 70s. Chance of precipitation 50 percent. Rainfall Amounts up to a half of an inch Possible, except higher Amounts possible in Thunderstorms.

Tonight 9 Sep Upper Slopes of the Eastern Washington Cascades Crest

Partly cloudy. A chance of Showers and Thunderstorms in the evening. Haze overnight. Lows in the mid 40s to lower 50s. Chance of precipitation 50 percent. Rainfall Amounts less than a tenth of an Inch, except higher Amounts possible in Thunderstorms.

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Twin Sisters Lake Temperature Statistics

September Temperature

Stampede Pass (36.7 miles)

  • Lowest 7 September, 2025

    51.1 °F

  • Average September

    66 °F

  • Highest 2 September, 2025

    87.1 °F

Climate (2020–Present)

Stampede Pass (36.7 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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