Rock Island Lakes Weather Forecast

    • 30
    • 41

    Chance Rain/Snow

    • 30
    • 35

    Snow

    • 25
    • 34

    Snow

    • 22
    • 34

    Partly Sunny

    • 23
    • 34

    Mostly Cloudy

    • 24
    • 35

    Partly Sunny

    • 25
    • 36

    Partly Sunny

Today 30 Oct Northwest Beaverhead County

Mostly cloudy. Slight chance of drizzle late in the afternoon. Highs 41 to 47. Southeast Winds up to 10 Mph.

Tonight 30 Oct Northwest Beaverhead County

Mostly cloudy. Chance of Rain, Snow, slight chance of drizzle and light freezing drizzle in the Evening, then slight chance of light freezing drizzle after midnight. Patchy dense fog through the night. Lows 28 to 34. South Winds up to 10 Mph. Chance of precipitation 50 percent.

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Rock Island Lakes Temperature Statistics

October Temperature

Salmon, Lemhi County Airport (15.5 miles)

  • Lowest 16 October, 2026

    25 °F

  • Average October

    47.2 °F

  • Highest 9 October, 2026

    82.9 °F

Climate (2021–2026)

Salmon, Lemhi County Airport (15.5 miles)

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  • Average Low 2021–2026

    33.1 °F

  • Average 2021–2026

    46 °F

  • Average High 2021–2026

    59.2 °F
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