Lower Granite Lake Weather Forecast

    • 53
    • 75

    Mostly Sunny

    • 59
    • 86

    Sunny

    • 59
    • 91

    Sunny

    • 61
    • 93

    Mostly Sunny

    • 62
    • 92

    Partly Sunny

    • 61
    • 87

    Partly Sunny

    • 56
    • 80

    Partly Sunny

Today 15 Sep Washington Palouse

Mostly cloudy with a chance of rain Showers in the Morning, then partly cloudy in the afternoon. Highs in the mid 60s to lower 70s. Southwest wind 5 to 15 Mph. Chance of precipitation 20 percent. Rainfall Amounts less than a tenth of an inch.

Tonight 15 Sep Washington Palouse

Mostly clear. Lows in the mid 40s to lower 50s. Light Wind, becoming east 5 to 10 Mph overnight.

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Lower Granite Lake Temperature Statistics

September Temperature

Lewiston, Lewiston-Nez Perce County Airport (22.4 miles)

  • Lowest 13 September, 2025

    57 °F

  • Average September

    75.8 °F

  • Highest 2 September, 2025

    102 °F

Climate (2020–Present)

Lewiston, Lewiston-Nez Perce County Airport (22.4 miles)

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  • Average Low 2020–2025

    45.5 °F

  • Average 2020–2025

    55.5 °F

  • Average High 2020–2025

    65.9 °F
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