Summit Reservoir Weather Forecast

    • 40
    • 54

    Partly Sunny

    • 37
    • 52

    Rain

    • 28
    • 41

    Rain/Snow

    • 29
    • 38

    Mostly Sunny

    • 31
    • 43

    Partly Sunny

    • 29
    • 43

    Chance Snow

    • 27
    • 41

    Slight Chance Snow

Today 21 Oct Lost River Range

Partly cloudy. Lows 27 to 34. Highs 41 to 50.

Tonight 21 Oct Lost River Range

Partly cloudy. Lows 40 to 47.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Summit Reservoir Temperature Statistics

October Temperature

Salmon, Lemhi County Airport (58.4 miles)

  • Lowest 16 October, 2026

    25 °F

  • Average October

    48.6 °F

  • Highest 9 October, 2026

    82.9 °F

Climate (2021–2026)

Salmon, Lemhi County Airport (58.4 miles)

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  • Average Low 2021–2026

    33.1 °F

  • Average 2021–2026

    46.1 °F

  • Average High 2021–2026

    59.2 °F
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