Tupper Lake Weather Forecast
- 41
- 64
Slight Chance Rain
- 43
- 69
Mostly Sunny
- 45
- 72
Mostly Sunny
- 46
- 72
Mostly Sunny
- 46
- 73
Mostly Sunny
- 46
- 73
Mostly Sunny
Today 19 Sep Butte/Blackfoot Region
Slight chance of Thunderstorms. Rain Showers likely until late Afternoon, then chance of rain Showers late in the afternoon. Areas of fog early in the morning. Patchy fog late in the morning. Chance of precipitation near 100 percent. Highs in the mid 50s to lower 60s.
Tonight 19 Sep Butte/Blackfoot Region
Mostly cloudy with a 20 percent chance of rain in the Evening, then partly cloudy after midnight. Patchy fog after midnight. Lows in the mid 30s to lower 40s.
Tupper Lake Temperature Statistics
September Temperature
Helena Regional Airport (52.2 miles)
Lowest 15 September, 2026
39.7 °FAverage September
61.1 °FHighest 10 September, 2026
87.7 °F
Climate (2021–2026)
Helena Regional Airport (52.2 miles)
Average Low 2021–2026
36.4 °FAverage 2021–2026
47.9 °FAverage High 2021–2026
59.9 °F