Lake Helena Weather Forecast

    • 45
    • 80

    Mostly Sunny

    • 45
    • 80

    Partly Sunny

    • 49
    • 82

    Mostly Sunny

    • 42
    • 75

    Slight Chance Thunderstorms

    • 43
    • 72

    Mostly Sunny

    • 44
    • 81

    Mostly Sunny

Today 18 Sep Helena Valley

Sunny. Patchy fog in the morning. Highs around 80. Southeast Winds up to 5 Mph shifting to the northeast in the afternoon.

Tonight 18 Sep Helena Valley

Mostly clear. Lows 45 to 50. North Winds up to 5 Mph shifting to the southwest after midnight.

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Lake Helena Temperature Statistics

September Temperature

Helena Regional Airport (6.8 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 (6.8 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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