Weather on September 15
Kalispell, MT
55 Years of Data
Avg High
71°F
Avg Low
40°F
Warmest
1981
66°F avg
Coldest
2006
41°F avg
About This Date
September 15th in Kalispell, MT typically brings pleasant fall weather, with average highs around 71°F and lows near 40°F — a 31°F daily swing. Over 55 years of records, the warmest September 15th was in 1981 (66°F average), while the coldest was 2006 (41°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 15th dates historically, with the wettest September 15th recording 1.45" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 15th in Kalispell, MT? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 68° | 53° | 61° | — | — |
| 2024 | 66° | 41° | 54° | — | — |
| 2023 | 77° | 39° | 58° | — | — |
| 2022 | 77° | 43° | 60° | — | — |
| 2021 | 74° | 52° | 63° | — | — |
| 2020 | 79° | 41° | 60° | — | — |
| 2019 | 80° | 39° | 60° | — | — |
| 2018 | 70° | 34° | 52° | — | — |
| 2017 | 56° | 46° | 51° | — | — |
| 2016 | 74° | 30° | 52° | — | — |
| 2015 | 64° | 37° | 51° | 0.2" | — |
| 2014 | 77° | 34° | 55° | — | — |
| 2013 | 86° | 44° | 65° | — | — |
| 2012 | 78° | 38° | 58° | — | — |
| 2011 | 65° | 42° | 53° | — | — |
| 2010 | 74° | 41° | 57° | — | — |
| 2009 | 85° | 44° | 64° | — | — |
| 2008 | 80° | 35° | 58° | — | — |
| 2007 | 81° | 33° | 57° | — | — |
| 2006coldest | 47° | 35° | 41° | 0.1" | — |
| 2005 | 73° | 40° | 56° | — | — |
| 2004 | 50° | 39° | 45° | 0.25" | — |
| 2003 | 69° | 48° | 59° | — | — |
| 2002 | 83° | 43° | 63° | — | — |
| 2001 | 81° | 44° | 62° | — | — |
| 2000 | 84° | 44° | 64° | — | — |
| 1999 | 80° | 35° | 58° | — | — |
| 1998 | 89° | 39° | 64° | — | — |
| 1997 | 56° | 48° | 52° | 1.45" | — |
| 1996 | 55° | 39° | 47° | 0.46" | — |
| 1995 | 80° | 38° | 59° | — | — |
| 1994 | 74° | 45° | 59° | — | — |
| 1993 | 51° | 41° | 46° | 0.81" | — |
| 1992 | 49° | 40° | 44° | 0.41" | — |
| 1991 | 66° | 34° | 50° | — | — |
| 1990 | 80° | 43° | 61° | 0.03" | — |
| 1989 | 80° | 36° | 58° | — | — |
| 1988 | 83° | 37° | 60° | — | — |
| 1987 | 65° | 40° | 52° | — | — |
| 1986 | 64° | 46° | 55° | 0.23" | — |
| 1985 | 56° | 44° | 50° | 0.94" | — |
| 1984 | 65° | 35° | 50° | — | — |
| 1983 | 71° | 34° | 52° | — | — |
| 1982 | 64° | 27° | 45° | — | — |
| 1981warmest | 85° | 47° | 66° | — | — |
| 1980 | 65° | 40° | 52° | 0.03" | — |
| 1979 | 84° | 37° | 61° | — | — |
| 1978 | 61° | 49° | 55° | 0.03" | — |
| 1977 | 74° | 49° | 61° | — | — |
| 1976 | 83° | 44° | 63° | — | — |
| 1975 | 80° | 41° | 61° | — | — |
| 1974 | 74° | 41° | 57° | — | — |
| 1973 | 59° | 33° | 46° | — | — |
| 1972 | 76° | 46° | 61° | — | — |
| 1971 | 63° | 32° | 47° | — | — |
55 years of data from KALISPELL