Coopers Lake Weather Forecast

    • 48
    • 70

    Rain Likely

    • 45
    • 64

    Rain Likely

    • 47
    • 70

    Mostly Sunny

    • 48
    • 72

    Mostly Sunny

    • 47
    • 71

    Mostly Sunny

    • 47
    • 70

    Mostly Sunny

Today 18 Sep Butte/Blackfoot Region

Areas of rain in the morning. Rain Showers likely and a chance of Thunderstorms in the afternoon. Areas of fog in the morning. Chance of precipitation 70 percent. Highs in the 60s to lower 70s. North Winds to 15 Mph in the afternoon.

Tonight 18 Sep Butte/Blackfoot Region

Rain Showers likely and a slight chance of Thunderstorms. Areas of fog after midnight. Chance of precipitation near 100 percent. Lows in the 40s.

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Coopers Lake Temperature Statistics

September Temperature

Helena Regional Airport (54.7 miles)

  • Lowest 15 September, 2026

    39.7 °F

  • Average September

    61 °F

  • Highest 10 September, 2026

    87.7 °F

Climate (2021–2026)

Helena Regional Airport (54.7 miles)

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  • Average Low 2021–2026

    36.4 °F

  • Average 2021–2026

    47.9 °F

  • Average High 2021–2026

    59.9 °F
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