Williams Lake Weather Forecast

    • 39
    • 58

    Decreasing Clouds

    • 43
    • 63

    Mostly Sunny

    • 43
    • 62

    Mostly Sunny

    • 48
    • 66

    Mostly Sunny

    • 46
    • 66

    Partly Sunny

    • 47
    • 64

    Mostly Sunny

    • 48
    • 66

    Mostly Sunny

Today 28 Sep Eastern Lemhi County

Partly cloudy. Highs in the upper 60s to mid 70s.

Tonight 28 Sep Eastern Lemhi County

Mostly clear. Lows in the 30s to lower 40s. Northwest Winds to 15 Mph in the evening.

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Williams Lake Temperature Statistics

September Temperature

Salmon, Lemhi County Airport (8.1 miles)

  • Lowest 15 September, 2026

    35.1 °F

  • Average September

    57.7 °F

  • Highest 10 September, 2026

    82.9 °F

Climate (2021–2026)

Salmon, Lemhi County Airport (8.1 miles)

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  • Average Low 2021–2026

    33.1 °F

  • Average 2021–2026

    46 °F

  • Average High 2021–2026

    59.1 °F
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