Weather on September 18
Kalispell, MT
55 Years of Data
Avg High
67°F
Avg Low
40°F
Warmest
1981
68°F avg
Coldest
1978
42°F avg
About This Date
September 18th in Kalispell, MT typically brings mild fall weather, with average highs around 67°F and lows near 40°F — a 27°F daily swing. Over 55 years of records, the warmest September 18th was in 1981 (68°F average), while the coldest was 1978 (42°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 31% of September 18th dates historically, with the wettest September 18th recording 2.46" of rain. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for September 18th in Kalispell, MT? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 42° | 61° | — | — |
| 2024 | 71° | 52° | 61° | — | — |
| 2023 | 77° | 39° | 58° | — | — |
| 2022 | 72° | 39° | 55° | — | — |
| 2021 | 68° | 44° | 56° | — | — |
| 2020 | 73° | 38° | 55° | — | — |
| 2019 | 56° | 42° | 49° | 0.08" | — |
| 2018 | 69° | 38° | 53° | — | — |
| 2017 | 59° | 40° | 49° | 0.81" | — |
| 2016 | 68° | 39° | 54° | — | — |
| 2015 | 64° | 39° | 52° | — | — |
| 2014 | 79° | 46° | 62° | — | — |
| 2013 | 54° | 47° | 50° | 2.46" | — |
| 2012 | 79° | 32° | 55° | — | — |
| 2011 | 64° | 46° | 55° | — | — |
| 2010 | 53° | 44° | 49° | 0.1" | — |
| 2009 | 81° | 36° | 58° | — | — |
| 2008 | 83° | 37° | 60° | — | — |
| 2007 | 62° | 38° | 50° | 0.66" | — |
| 2006 | 64° | 28° | 46° | — | — |
| 2005 | 63° | 37° | 50° | 0.03" | — |
| 2004 | 52° | 41° | 46° | 0.84" | — |
| 2003 | 62° | 39° | 51° | — | — |
| 2002 | 65° | 42° | 53° | — | — |
| 2001 | 79° | 38° | 58° | — | — |
| 2000 | 73° | 50° | 62° | — | — |
| 1999 | 71° | 38° | 54° | — | — |
| 1998 | 65° | 47° | 56° | 0.03" | — |
| 1997 | 53° | 42° | 48° | 0.3" | — |
| 1996 | 52° | 45° | 48° | 0.46" | — |
| 1995 | 60° | 41° | 51° | 0.91" | — |
| 1994 | 79° | 38° | 58° | — | — |
| 1993 | 67° | 29° | 48° | — | — |
| 1992 | 66° | 26° | 46° | — | — |
| 1991 | 64° | 35° | 50° | — | — |
| 1990 | 75° | 36° | 55° | — | — |
| 1989 | 50° | 42° | 46° | 0.64" | — |
| 1988 | 54° | 33° | 43° | — | — |
| 1987 | 68° | 29° | 48° | — | — |
| 1986 | 55° | 41° | 48° | 0.1" | — |
| 1985 | 50° | 35° | 43° | 0.33" | — |
| 1984 | 85° | 40° | 62° | — | — |
| 1983 | 45° | 40° | 42° | 0.15" | — |
| 1982 | 77° | 36° | 56° | — | — |
| 1981warmest | 87° | 48° | 68° | — | — |
| 1980 | 61° | 44° | 52° | 0.1" | — |
| 1979 | 81° | 41° | 61° | — | — |
| 1978coldest | 53° | 30° | 42° | — | — |
| 1977 | 65° | 38° | 51° | — | — |
| 1976 | 73° | 55° | 64° | — | — |
| 1975 | 58° | 35° | 46° | 0.66" | — |
| 1974 | 77° | 42° | 60° | — | — |
| 1973 | 64° | 45° | 54° | — | — |
| 1972 | 77° | 48° | 63° | — | — |
| 1971 | 61° | 28° | 44° | — | — |
55 years of data from KALISPELL