Weather on September 22
Longmont, CO
55 Years of Data
Avg High
73°F
Avg Low
42°F
Warmest
2001
70°F avg
Coldest
1995
29°F avg
About This Date
September 22nd in Longmont, CO typically brings pleasant fall weather, with average highs around 73°F and lows near 42°F — a 31°F daily swing. Over 55 years of records, the warmest September 22nd was in 2001 (70°F average), while the coldest was 1995 (29°F) — a 41°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 22nd dates historically, with the wettest September 22nd recording 2.03" of rain. The last decade has been 6.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.6°F warmer on this date compared to 20-30 years ago.
Planning for September 22nd in Longmont, CO? Great weather for outdoor activities.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 50° | 66° | — | — |
| 2024 | 70° | 48° | 59° | 1.37" | — |
| 2023 | 79° | 48° | 63° | — | — |
| 2022 | 59° | 48° | 54° | 1.02" | — |
| 2021 | 69° | 39° | 54° | — | — |
| 2020 | 85° | 50° | 67° | — | — |
| 2019 | 79° | 43° | 61° | — | — |
| 2018 | 76° | 45° | 60° | — | — |
| 2017 | 88° | 44° | 66° | — | — |
| 2016 | 74° | 51° | 62° | — | — |
| 2015 | 84° | 46° | 65° | — | — |
| 2014 | 77° | 54° | 65° | 0.13" | — |
| 2013 | 80° | 52° | 66° | 0.1" | — |
| 2012 | 77° | 47° | 62° | — | — |
| 2011 | 75° | 37° | 56° | 0.08" | — |
| 2010 | 73° | 49° | 61° | 0.08" | — |
| 2009 | 52° | 38° | 45° | — | — |
| 2008 | 80° | 49° | 64° | — | — |
| 2007 | 89° | 46° | 68° | — | — |
| 2006 | 58° | 39° | 48° | — | — |
| 2005 | 75° | 52° | 63° | 0.18" | — |
| 2004 | 45° | 41° | 43° | 2.03" | — |
| 2003 | 76° | 39° | 57° | — | — |
| 2002 | 65° | 42° | 53° | — | — |
| 2001warmest | 91° | 49° | 70° | — | — |
| 2000 | 76° | 34° | 55° | 0.25" | — |
| 1999 | 74° | 31° | 52° | — | — |
| 1998 | 51° | 40° | 45° | — | — |
| 1997 | 58° | 42° | 50° | — | — |
| 1996 | 80° | 36° | 58° | — | — |
| 1995coldest | 36° | 23° | 29° | — | — |
| 1994 | 67° | 30° | 48° | 1.32" | — |
| 1993 | 86° | 40° | 63° | — | — |
| 1992 | 83° | — | — | — | — |
| 1991 | 89° | 36° | 62° | — | — |
| 1990 | 68° | 42° | 55° | — | — |
| 1989 | 66° | 39° | 53° | — | — |
| 1988 | 79° | 40° | 59° | — | — |
| 1987 | 73° | 37° | 55° | — | — |
| 1986 | 71° | 53° | 62° | — | — |
| 1985 | 58° | 35° | 46° | 0.74" | — |
| 1984 | 85° | 43° | 64° | — | — |
| 1983 | 69° | 26° | 48° | — | — |
| 1982 | 77° | 45° | 61° | — | — |
| 1981 | 87° | 49° | 68° | — | — |
| 1980 | 81° | 48° | 64° | — | — |
| 1979 | 77° | 45° | 61° | — | — |
| 1978 | 67° | 34° | 50° | — | — |
| 1977 | 77° | 37° | 57° | — | — |
| 1976 | 73° | 45° | 59° | — | — |
| 1975 | 68° | 35° | 52° | — | — |
| 1974 | 67° | 37° | 52° | — | — |
| 1973 | 77° | 39° | 58° | — | — |
| 1972 | 76° | 38° | 57° | — | — |
| 1971 | 40° | 33° | 36° | 0.64" | — |
55 years of data from LONGMONT 2 ESE