Rock Island Lakes Weather Forecast

    • 23
    • 36

    Chance Snow

    • 23
    • 38

    Chance Snow

    • 26
    • 43

    Mostly Sunny

    • 31
    • 51

    Partly Sunny

    • 33
    • 53

    Slight Chance Rain/Snow

    • 32
    • 54

    Chance Rain

    • 33
    • 55

    Chance Rain

Today 28 Apr Northwest Beaverhead County

Not as cool. Partly sunny. Chance of snow Showers and slight chance of Thunderstorms early in the Afternoon, then chance of snow Showers, rain Showers and slight chance of Thunderstorms late in the afternoon. Highs 37 to 47. West Winds 5 to 15 Mph with Gusts to around 30 Mph. Chance of precipitation 50 percent.

Tonight 28 Apr Northwest Beaverhead County

Mostly cloudy. Slight chance of rain and snow early in the Evening, then slight chance of snow in the late evening and overnight. Patchy fog late in the night. Lows in the mid 20s. West Winds up to 10 Mph. Gusts up to 30 Mph decreasing to 20 Mph after midnight. Chance of precipitation 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rock Island Lakes Temperature Statistics

April Temperature

Salmon, Lemhi County Airport (15.5 miles)

  • Lowest 18 April, 2026

    19.9 °F

  • Average April

    44.9 °F

  • Highest 19 April, 2026

    71.1 °F

Climate (2021–Present)

Salmon, Lemhi County Airport (15.5 miles)

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  • Average Low 2021–2026

    33.1 °F

  • Average 2021–2026

    46.1 °F

  • Average High 2021–2026

    59.1 °F
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