Miller Lake Weather Forecast

    • 57
    • 89

    Slight Chance Rain

    • 54
    • 84

    Slight Chance Thunderstorms

    • 51
    • 80

    Mostly Sunny

    • 53
    • 80

    Mostly Sunny

    • 56
    • 85

    Mostly Sunny

    • 57
    • 86

    Partly Sunny

Today 19 Aug Butte/Blackfoot Region

Mostly sunny. A 20 percent chance of rain in the afternoon. Highs in the mid 80s to lower 90s.

Tonight 19 Aug Butte/Blackfoot Region

Partly cloudy. A 20 percent chance of rain in the evening. Lows in the upper 40s to mid 50s.

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Miller Lake Temperature Statistics

August Temperature

Helena Regional Airport (46 miles)

  • Lowest 7 August, 2025

    49.6 °F

  • Average August

    70 °F

  • Highest 12 August, 2025

    95.6 °F

Climate (2020–Present)

Helena Regional Airport (46 miles)

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  • Average Low 2020–2025

    36 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    59.4 °F
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