Harrison Lake Weather Forecast

    • 40
    • 61

    Chance Thunderstorms

    • 43
    • 59

    Mostly Sunny

    • 44
    • 64

    Mostly Sunny

    • 45
    • 69

    Slight Chance Thunderstorms

    • 39
    • 63

    Chance Rain Showers

    • 31
    • 51

    Rain/Snow Likely

    • 31
    • 43

    Snow Showers Likely

Today 16 Jun Northwest Beaverhead County

Mostly cloudy. A 50 percent chance of Thunderstorms in the afternoon. Highs 65 to 70. South Winds up to 10 Mph shifting to the west in the afternoon.

Tonight 16 Jun Northwest Beaverhead County

Mostly cloudy. Chance of rain Showers and slight chance of Thunderstorms in the Evening, then slight chance of rain Showers after midnight. Lows 40 to 45. Northwest Winds up to 10 Mph. Chance of precipitation 50 percent.

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Harrison Lake Temperature Statistics

June Temperature

Dillon, Dillon Airport (31.7 miles)

  • Lowest 3 June, 2025

    33.7 °F

  • Average June

    59.3 °F

  • Highest 9 June, 2025

    85.6 °F

Climate (2020–Present)

Dillon, Dillon Airport (31.7 miles)

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  • Average Low 2020–2025

    30.6 °F

  • Average 2020–2025

    42.8 °F

  • Average High 2020–2025

    55.7 °F
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