Summit Reservoir Weather Forecast

    • 40
    • 54

    Rain Showers Likely

    • 37
    • 56

    Partly Sunny

    • 38
    • 58

    Slight Chance Thunderstorms

    • 42
    • 65

    Partly Sunny

    • 45
    • 67

    Partly Sunny

    • 43
    • 66

    Mostly Sunny

Today 30 May Lost River Range

A chance of rain in the morning. Then rain Showers likely and a chance of Thunderstorms in the afternoon. Highs 54 to 64.

Tonight 30 May Lost River Range

Rain Showers likely and a slight chance of Thunderstorms in the evening. Then a slight chance of rain after midnight. Colder. Lows 40 to 47.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Summit Reservoir Temperature Statistics

May Temperature

Salmon, Lemhi County Airport (58.4 miles)

  • Lowest 19 May, 2026

    27 °F

  • Average May

    56.6 °F

  • Highest 28 May, 2026

    89.1 °F

Climate (2021–Present)

Salmon, Lemhi County Airport (58.4 miles)

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  • Average Low 2021–2026

    33.1 °F

  • Average 2021–2026

    46.2 °F

  • Average High 2021–2026

    59.2 °F
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