Tupper Lake Weather Forecast

    • 45
    • 69

    Rain Showers

    • 45
    • 71

    Rain Showers

    • 39
    • 54

    Rain

    • 39
    • 63

    Partly Sunny

    • 42
    • 70

    Mostly Sunny

    • 44
    • 72

    Partly Sunny

Today 5 Sep Butte/Blackfoot Region

Mostly cloudy. Areas of rain early in the morning. Chance of Showers and Thunderstorms in the afternoon. Areas of fog early in the morning. Patchy fog late in the morning. Chance of precipitation 50 percent. Highs in the mid 60s to lower 70s.

Tonight 5 Sep Butte/Blackfoot Region

Partly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly cloudy with a slight chance of rain after midnight. Chance of precipitation 40 percent. Lows in the upper 30s to mid 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Tupper Lake Temperature Statistics

September Temperature

Helena Regional Airport (52.2 miles)

  • Lowest 3 September, 2026

    46.9 °F

  • Average September

    65 °F

  • Highest 1 September, 2026

    85.6 °F

Climate (2021–2026)

Helena Regional Airport (52.2 miles)

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  • Average Low 2021–2026

    36.4 °F

  • Average 2021–2026

    48 °F

  • Average High 2021–2026

    60 °F
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