Fort Harrison Army Airfield Weather Forecast

    • 31
    • 56

    Decreasing Clouds

    • 39
    • 65

    Slight Chance Rain

    • 38
    • 60

    Rain Showers Likely

    • 38
    • 65

    Partly Sunny

    • 41
    • 70

    Partly Sunny

    • 45
    • 76

    Partly Sunny

    • 47
    • 79

    Partly Sunny

Today 18 May Helena Valley

Mostly sunny. Highs in the mid 50s. North Winds 5 to 10 Mph.

Tonight 18 May Helena Valley

Partly cloudy. Lows in the upper 20s. West Winds up to 5 Mph shifting to the south after midnight.

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Fort Harrison Army Airfield Temperature Statistics

May Temperature

Helena Regional Airport (5.6 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 (5.6 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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