Upper Holter Lake Weather Forecast

    • 30
    • 56

    Partly Sunny

    • 38
    • 65

    Slight Chance Rain

    • 37
    • 59

    Rain Likely

    • 38
    • 65

    Slight Chance Rain

    • 41
    • 70

    Slight Chance Thunderstorms

    • 47
    • 75

    Partly Sunny

    • 47
    • 78

    Partly Sunny

Today 18 May Gates of the Mountains

Not as cool. Mostly sunny. Highs 47 to 55. Northeast Winds up to 10 Mph.

Tonight 18 May Gates of the Mountains

Partly cloudy. Lows in the upper 20s. Southwest Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Upper Holter Lake Temperature Statistics

May Temperature

Helena Regional Airport (14.9 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 (14.9 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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