Helena National Forest Weather Forecast

    • 52
    • 76

    Mostly Sunny

    • 51
    • 77

    Partly Sunny

    • 53
    • 79

    Mostly Sunny

    • 46
    • 72

    Slight Chance Rain

    • 48
    • 69

    Mostly Sunny

    • 50
    • 77

    Mostly Sunny

Today 18 Sep Big Belt

Sunny. Highs 65 to 75. Southwest Winds up to 10 Mph shifting to the west in the afternoon.

Tonight 18 Sep Big Belt

Mostly clear. Lows 45 to 50. Northeast Winds up to 10 Mph shifting to the southeast after midnight.

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Helena National Forest Temperature Statistics

September Temperature

Helena Regional Airport (15.5 miles)

  • Lowest 5 September, 2025

    46 °F

  • Average September

    64.9 °F

  • Highest 3 September, 2025

    91.9 °F

Climate (2020–Present)

Helena Regional Airport (15.5 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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