Cottonwood Lake Weather Forecast

    • 38
    • 57

    Mostly Sunny

    • 40
    • 61

    Increasing Clouds

    • 36
    • 54

    Partly Sunny

    • 30
    • 55

    Rain/Snow

    • 31
    • 35

    Snow Likely

    • 32
    • 43

    Mostly Sunny

    • 33
    • 48

    Partly Sunny

Today 9 Sep Southern Clearwater Mountains

Mostly sunny. Patchy fog early in the morning. Highs 66 to 81.

Tonight 9 Sep Southern Clearwater Mountains

Mostly clear. Lows 38 to 53.

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Cottonwood Lake Temperature Statistics

September Temperature

Salmon, Lemhi County Airport (45.4 miles)

  • Lowest 1 September, 2026

    46 °F

  • Average September

    59.7 °F

  • Highest 1 September, 2026

    82 °F

Climate (2021–2026)

Salmon, Lemhi County Airport (45.4 miles)

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  • Average Low 2021–2026

    33.1 °F

  • Average 2021–2026

    46.1 °F

  • Average High 2021–2026

    59.1 °F
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