Montana City Weather Forecast

    • 50
    • 81

    Chance Thunderstorms

    • 48
    • 75

    Rain Showers Likely

    • 48
    • 71

    Rain Showers Likely

    • 47
    • 70

    Rain Showers Likely

    • 47
    • 74

    Chance Rain Showers

    • 46
    • 74

    Chance Rain Showers

    • 46
    • 70

    Chance Rain Showers

Today 10 Sep Elkhorn and Boulder Mountains

Partly cloudy late in the morning then becoming mostly cloudy. Slight chance of rain Showers late in the Morning, then slight chance of Thunderstorms in the afternoon. Highs 70 to 75. Southeast Winds up to 10 Mph. Chance of precipitation 20 percent.

Tonight 10 Sep Elkhorn and Boulder Mountains

Mostly cloudy with slight chance of Thunderstorms in the Evening, then partly cloudy with slight chance of rain Showers after midnight. Lows 45 to 55. Northeast Winds up to 10 Mph shifting to the north after midnight. Chance of precipitation 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Montana City Temperature Statistics

September Temperature

Helena Regional Airport (5 miles)

  • Lowest 5 September, 2025

    46 °F

  • Average September

    67.2 °F

  • Highest 3 September, 2025

    91.9 °F

Climate (2020–Present)

Helena Regional Airport (5 miles)

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  • Average Low 2020–2025

    36.1 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    59.4 °F
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