Weather on September 20
Kalispell, MT
55 Years of Data
Avg High
66°F
Avg Low
38°F
Warmest
2015
67°F avg
Coldest
1983
38°F avg
About This Date
September 20th in Kalispell, MT typically brings mild fall weather, with average highs around 66°F and lows near 38°F — a 28°F daily swing. Over 55 years of records, the warmest September 20th was in 2015 (67°F average), while the coldest was 1983 (38°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 36% of September 20th dates historically, with the wettest September 20th recording 0.99" of rain. The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
Planning for September 20th in Kalispell, MT? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 40° | 61° | — | — |
| 2024 | 70° | 46° | 58° | — | — |
| 2023 | 66° | 33° | 50° | — | — |
| 2022 | 65° | 34° | 49° | — | — |
| 2021 | 58° | 37° | 47° | — | — |
| 2020 | 70° | 40° | 55° | — | — |
| 2019 | 62° | 40° | 51° | — | — |
| 2018 | 64° | 30° | 47° | 0.33" | — |
| 2017 | 56° | 41° | 48° | 0.23" | — |
| 2016 | 67° | 36° | 51° | — | — |
| 2015warmest | 78° | 55° | 67° | — | — |
| 2014 | 79° | 38° | 58° | — | — |
| 2013 | 73° | 36° | 54° | — | — |
| 2012 | 81° | 36° | 58° | — | — |
| 2011 | 65° | 33° | 49° | — | — |
| 2010 | 60° | 47° | 53° | 0.97" | — |
| 2009 | 65° | 33° | 49° | — | — |
| 2008 | 78° | 47° | 62° | 0.13" | — |
| 2007 | 49° | 33° | 41° | 0.51" | — |
| 2006 | 57° | 48° | 53° | 0.33" | — |
| 2005 | 73° | 33° | 53° | — | — |
| 2004 | 50° | 38° | 44° | 0.69" | — |
| 2003 | 62° | 39° | 51° | — | — |
| 2002 | 66° | 36° | 51° | — | — |
| 2001 | 72° | 30° | 51° | — | — |
| 2000 | 50° | 32° | 41° | 0.36" | — |
| 1999 | 74° | 26° | 50° | — | — |
| 1998 | 62° | 36° | 49° | — | — |
| 1997 | 67° | 33° | 50° | — | — |
| 1996 | 54° | 43° | 48° | 0.2" | — |
| 1995 | 55° | 26° | 41° | — | — |
| 1994 | 80° | 37° | 59° | — | — |
| 1993 | 56° | 35° | 45° | 0.74" | — |
| 1992 | 67° | 53° | 60° | — | — |
| 1991 | 78° | 33° | 56° | — | — |
| 1990 | 72° | 42° | 57° | — | — |
| 1989 | 68° | 34° | 51° | — | — |
| 1988 | 58° | 40° | 49° | 0.99" | — |
| 1987 | 76° | 31° | 53° | — | — |
| 1986 | 56° | 44° | 50° | 0.2" | — |
| 1985 | 56° | 37° | 46° | — | — |
| 1984 | 61° | 52° | 56° | 0.99" | — |
| 1983coldest | 55° | 21° | 38° | — | — |
| 1982 | 77° | 50° | 64° | 0.46" | — |
| 1981 | 64° | 42° | 53° | 0.1" | — |
| 1980 | 57° | 40° | 48° | 0.03" | — |
| 1979 | 81° | 45° | 63° | — | — |
| 1978 | 62° | 30° | 46° | — | — |
| 1977 | 64° | 45° | 54° | 0.03" | — |
| 1976 | 78° | 40° | 59° | — | — |
| 1975 | 64° | 32° | 48° | — | — |
| 1974 | 75° | 44° | 60° | — | — |
| 1973 | 64° | 48° | 56° | 0.25" | — |
| 1972 | 60° | 36° | 48° | 0.03" | — |
| 1971 | 63° | 42° | 52° | 0.03" | — |
55 years of data from KALISPELL