Twin Sisters Lake Weather Forecast

    • 46
    • 71

    Mostly Sunny

    • 43
    • 59

    Partly Sunny

    • 41
    • 60

    Partly Sunny

    • 38
    • 55

    Partly Sunny

    • 43
    • 63

    Partly Sunny

    • 43
    • 62

    Partly Sunny

Today 26 Aug Upper Slopes of the Eastern Washington Cascades Crest

Sunny. Patchy smoke. Highs in the lower 70s to lower 80s. Gusts up to 20 Mph in the afternoon.

Tonight 26 Aug Upper Slopes of the Eastern Washington Cascades Crest

Partly cloudy. Patchy smoke. Lows in the mid 40s to lower 50s.

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Twin Sisters Lake Temperature Statistics

August Temperature

Stampede Pass (36.7 miles)

  • Lowest 3 August, 2026

    42.1 °F

  • Average August

    59 °F

  • Highest 21 August, 2026

    86 °F

Climate (2021–2026)

Stampede Pass (36.7 miles)

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  • Average Low 2021–2026

    36.2 °F

  • Average 2021–2026

    41.5 °F

  • Average High 2021–2026

    48.2 °F
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