Arrastra Mountain Weather Forecast

    • 46
    • 60

    Chance Rain Showers

    • 47
    • 61

    Chance Rain Showers

    • 44
    • 50

    Rain Showers Likely

    • 44
    • 53

    Chance Rain Showers

    • 44
    • 59

    Mostly Sunny

    • 45
    • 58

    Partly Sunny

Today 13 Sep Butte/Blackfoot Region

Mostly sunny in the Morning, then mostly cloudy with a 20 percent chance of Showers and Thunderstorms in the afternoon. Patchy fog in the morning. Highs in the upper 60s to mid 70s.

Tonight 13 Sep Butte/Blackfoot Region

Partly cloudy. Lows in the upper 30s to mid 40s.

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Arrastra Mountain Temperature Statistics

September Temperature

Helena Regional Airport (51 miles)

  • Lowest 5 September, 2025

    46 °F

  • Average September

    67 °F

  • Highest 3 September, 2025

    91.9 °F

Climate (2020–Present)

Helena Regional Airport (51 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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