Helena National Forest Weather Forecast

    • 31
    • 54

    Partly Sunny

    • 39
    • 62

    Partly Sunny

    • 37
    • 56

    Rain Likely

    • 38
    • 63

    Slight Chance Rain

    • 43
    • 67

    Slight Chance Thunderstorms

    • 48
    • 74

    Partly Sunny

    • 49
    • 77

    Partly Sunny

Today 18 May Big Belt

Mostly sunny. Highs 38 to 48. North Winds 5 to 15 Mph.

Tonight 18 May Big Belt

Mostly clear. Lows 22 to 28. North Winds up to 10 Mph shifting to the southwest after midnight. Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Helena National Forest Temperature Statistics

May Temperature

Helena Regional Airport (15.5 miles)

  • Lowest 6 May, 2026

    27.6 °F

  • Average May

    55.7 °F

  • Highest 13 May, 2026

    84.7 °F

Climate (2021–Present)

Helena Regional Airport (15.5 miles)

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  • Average Low 2021–2026

    36.5 °F

  • Average 2021–2026

    48.1 °F

  • Average High 2021–2026

    60.1 °F
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