Helena Weather Forecast

    • 50
    • 78

    Increasing Clouds

    • 50
    • 74

    Rain

    • 46
    • 68

    Rain

    • 47
    • 75

    Mostly Sunny

    • 47
    • 78

    Mostly Sunny

    • 47
    • 78

    Mostly Sunny

Today 17 Sep Helena Valley

Warmer. Partly sunny. A 20 percent chance of rain Showers late in the afternoon. Highs in the upper 70s. Southeast Winds up to 10 Mph.

Tonight 17 Sep Helena Valley

Mostly cloudy with chance of rain Showers and slight chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the upper 40s. Southeast Winds up to 10 Mph shifting to the southwest after midnight. Chance of precipitation 40 percent.

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Helena Temperature Statistics

September Temperature

Helena Regional Airport (1.9 miles)

  • Lowest 9 September, 2026

    41.6 °F

  • Average September

    61.8 °F

  • Highest 10 September, 2026

    87.7 °F

Climate (2021–2026)

Helena Regional Airport (1.9 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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