Grand Falls Weather Forecast
- 58
- 78
Mostly Cloudy
- 62
- 79
Mostly Cloudy
- 61
- 81
Chance Thunderstorms
- 59
- 84
Chance Thunderstorms
- 55
- 76
Chance Rain Showers
- 47
- 70
Chance Rain Showers
- 45
- 62
Chance Rain Showers
Today 13 Sep Koochiching
Mostly sunny. Near steady temperature in the mid 70s. East Winds 5 to 10 Mph.
Tonight 13 Sep Koochiching
Partly cloudy in the Evening, then becoming mostly cloudy. Humid with Lows in the upper 50s. East Winds around 5 Mph.
Grand Falls Temperature Statistics
September Temperature
Bigfork Municipal Airport (29.2 miles)
Lowest 7 September, 2025
32 °FAverage September
55.5 °FHighest 1 September, 2025
80.6 °F
Climate (2020–Present)
Bigfork Municipal Airport (29.2 miles)
Average Low 2020–2025
30.9 °FAverage 2020–2025
42.2 °FAverage High 2020–2025
52.4 °F