Weather on September 21
Kalispell, MT
55 Years of Data
Avg High
65°F
Avg Low
36°F
Warmest
2014
64°F avg
Coldest
1995
39°F avg
About This Date
September 21st in Kalispell, MT typically brings mild fall weather, with average highs around 65°F and lows near 36°F — a 29°F daily swing. Over 55 years of records, the warmest September 21st was in 2014 (64°F average), while the coldest was 1995 (39°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 27% of September 21st dates historically, with the wettest September 21st recording 2.21" of rain. The last decade has been 4.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.8°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Kalispell, MT? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 60° | 38° | 49° | 0.18" | — |
| 2024 | 66° | 34° | 50° | — | — |
| 2023 | 64° | 46° | 55° | 0.08" | — |
| 2022 | 75° | 31° | 53° | — | — |
| 2021 | 67° | 33° | 50° | — | — |
| 2020 | 73° | 32° | 53° | — | — |
| 2019 | 64° | 50° | 57° | — | — |
| 2018 | 71° | 37° | 54° | — | — |
| 2017 | 56° | 34° | 45° | — | — |
| 2016 | 64° | 49° | 56° | 0.03" | — |
| 2015 | 72° | 39° | 55° | — | — |
| 2014warmest | 86° | 42° | 64° | — | — |
| 2013 | 66° | 41° | 54° | — | — |
| 2012 | 85° | 37° | 61° | — | — |
| 2011 | 70° | 31° | 50° | — | — |
| 2010 | 58° | 37° | 47° | 0.18" | — |
| 2009 | 65° | 27° | 46° | — | — |
| 2008 | 60° | 50° | 55° | 2.21" | — |
| 2007 | 65° | 33° | 49° | — | — |
| 2006 | 52° | 38° | 45° | 0.38" | — |
| 2005 | 65° | 32° | 48° | — | — |
| 2004 | 53° | 30° | 42° | — | — |
| 2003 | 64° | 33° | 49° | — | — |
| 2002 | 61° | 27° | 44° | — | — |
| 2001 | 71° | 31° | 51° | — | — |
| 2000 | 45° | 33° | 39° | — | — |
| 1999 | 80° | 31° | 55° | — | — |
| 1998 | 66° | 32° | 49° | — | — |
| 1997 | 69° | 33° | 51° | — | — |
| 1996 | 56° | 37° | 46° | — | — |
| 1995coldest | 56° | 22° | 39° | — | — |
| 1994 | 67° | 34° | 50° | — | — |
| 1993 | 52° | 32° | 42° | 0.13" | — |
| 1992 | 75° | 39° | 57° | — | — |
| 1991 | 55° | 35° | 45° | 0.53" | — |
| 1990 | 75° | 35° | 55° | — | — |
| 1989 | 67° | 34° | 50° | — | — |
| 1988 | 62° | 33° | 48° | — | — |
| 1987 | 80° | 34° | 57° | — | — |
| 1986 | 54° | 40° | 47° | 0.46" | — |
| 1985 | 60° | 39° | 50° | 0.2" | — |
| 1984 | 52° | 42° | 47° | 0.64" | — |
| 1983 | 62° | 23° | 43° | — | — |
| 1982 | 62° | 44° | 53° | 0.05" | — |
| 1981 | 62° | 43° | 52° | 0.1" | — |
| 1980 | 53° | 41° | 47° | 0.08" | — |
| 1979 | 83° | 43° | 63° | — | — |
| 1978 | 61° | 33° | 47° | — | — |
| 1977 | 61° | 40° | 50° | — | — |
| 1976 | 78° | 41° | 60° | — | — |
| 1975 | 70° | 38° | 54° | — | — |
| 1974 | 77° | 40° | 58° | — | — |
| 1973 | 65° | 48° | 56° | 0.03" | — |
| 1972 | 70° | 42° | 56° | — | — |
| 1971 | 60° | 27° | 43° | — | — |
55 years of data from KALISPELL