Tupper Lake Weather Forecast

    • 31
    • 53

    Increasing Clouds

    • 39
    • 61

    Mostly Cloudy

    • 35
    • 63

    Mostly Sunny

    • 41
    • 63

    Slight Chance Rain

    • 37
    • 60

    Partly Sunny

    • 38
    • 61

    Partly Sunny

Today 26 Sep Butte/Blackfoot Region

Mostly cloudy. Cooler. Highs in the 50s. West Winds to 15 Mph in the afternoon.

Tonight 26 Sep Butte/Blackfoot Region

Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 20s to mid 30s. Northwest Winds to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Tupper Lake Temperature Statistics

September Temperature

Helena Regional Airport (52.2 miles)

  • Lowest 15 September, 2026

    39.7 °F

  • Average September

    61.1 °F

  • Highest 10 September, 2026

    87.7 °F

Climate (2021–2026)

Helena Regional Airport (52.2 miles)

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  • Average Low 2021–2026

    36.4 °F

  • Average 2021–2026

    47.9 °F

  • Average High 2021–2026

    59.9 °F
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