Helena National Forest Weather Forecast

    • 33
    • 38

    Rain/Snow Likely

    • 31
    • 42

    Chance Rain

    • 36
    • 44

    Slight Chance Rain/Snow

    • 27
    • 48

    Chance Rain/Snow

    • 29
    • 39

    Chance Snow

    • 26
    • 38

    Slight Chance Snow

    • 28
    • 38

    Mostly Cloudy

Today 21 Dec Big Belt

Not as cold. Chance of snow late in the Morning, then snow likely in the afternoon. Rain likely late in the afternoon. New snow accumulation up to 3 Inches. Highs 32 to 38. South Winds 5 to 10 Mph with Gusts to around 25 Mph. Chance of precipitation 70 percent.

Tonight 21 Dec Big Belt

Not as cold. Cloudy. Snow with rain likely and freezing rain in the Evening, then chance of Rain, snow and light freezing rain after midnight. Snow accumulation up to 4 Inches. Total snow accumulation up to 6 Inches. Ice accumulation of less than one quarter of an inch. Near steady temperature in the lower 30s. Southwest Winds up to 10 Mph. Gusts up to 25 Mph increasing to 35 Mph after midnight. Chance of precipitation 90 percent.

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Helena National Forest Temperature Statistics

December Temperature

Helena Regional Airport (15.5 miles)

  • Lowest 1 December, 2025

    3 °F

  • Average December

    36.8 °F

  • Highest 10 December, 2025

    61 °F

Climate (2020–Present)

Helena Regional Airport (15.5 miles)

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  • Average Low 2020–2025

    36.3 °F

  • Average 2020–2025

    47.7 °F

  • Average High 2020–2025

    59.6 °F
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