Summit Reservoir Weather Forecast

    • 28
    • 47

    Chance Thunderstorms

    • 28
    • 39

    Snow

    • 31
    • 44

    Partly Sunny

    • 24
    • 41

    Snow

    • 14
    • 28

    Snow

    • 18
    • 32

    Slight Chance Snow

    • 26
    • 42

    Partly Sunny

Today 12 Apr Lost River Range

Mostly cloudy. A chance of snow and rain in the morning. Then a chance of snow Showers, rain Showers and a slight chance of Thunderstorms in the afternoon. Breezy. Snow accumulation of 1 to 3 Inches. Highs 48 to 58.

Tonight 12 Apr Lost River Range

Mostly cloudy with a chance of snow in the evening. Then partly cloudy with a slight chance of snow after midnight. Colder. Snow accumulation up to 2 Inches. Lows 28 to 35.

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  • Temperature Forecast NOAA

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Summit Reservoir Temperature Statistics

April Temperature

Salmon, Lemhi County Airport (58.4 miles)

  • Lowest 4 April, 2026

    24.1 °F

  • Average April

    46.8 °F

  • Highest 6 April, 2026

    70 °F

Climate (2021–Present)

Salmon, Lemhi County Airport (58.4 miles)

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  • Average Low 2021–2026

    33 °F

  • Average 2021–2026

    46.1 °F

  • Average High 2021–2026

    59.1 °F
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