Grouse Flat State Wildlife Recreation Area Weather Forecast

    • 40
    • 58

    Increasing Clouds

    • 42
    • 63

    Mostly Cloudy

    • 44
    • 66

    Mostly Sunny

    • 46
    • 66

    Partly Sunny

    • 45
    • 63

    Partly Sunny

    • 44
    • 63

    Partly Sunny

Today 26 Sep Northeast Blue Mountains

Mostly cloudy in the morning then clearing. Highs in the mid 50s to mid 60s.

Tonight 26 Sep Northeast Blue Mountains

Mostly cloudy. Lows in the lower 40s.

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Grouse Flat State Wildlife Recreation Area Temperature Statistics

September Temperature

Lewiston, Lewiston-Nez Perce County Airport (33.6 miles)

  • Lowest 5 September, 2026

    49.6 °F

  • Average September

    65.3 °F

  • Highest 10 September, 2026

    88.6 °F

Climate (2021–2026)

Lewiston, Lewiston-Nez Perce County Airport (33.6 miles)

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  • Average Low 2021–2026

    45.5 °F

  • Average 2021–2026

    55.5 °F

  • Average High 2021–2026

    65.9 °F
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