Weather on September 26
Longmont, CO
55 Years of Data
Avg High
77°F
Avg Low
42°F
Warmest
1998
71°F avg
Coldest
1984
41°F avg
About This Date
September 26th in Longmont, CO typically brings pleasant fall weather, with average highs around 77°F and lows near 42°F — a 35°F daily swing. Over 55 years of records, the warmest September 26th was in 1998 (71°F average), while the coldest was 1984 (41°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 11% of September 26th dates historically, with the wettest September 26th recording 1.3" of rain. The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for September 26th in Longmont, CO? Great weather for outdoor activities.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 43° | 60° | — | — |
| 2024 | 85° | 49° | 67° | — | — |
| 2023 | 81° | 43° | 62° | — | — |
| 2022 | 72° | 44° | 58° | — | — |
| 2021 | 86° | 44° | 65° | — | — |
| 2020 | 84° | 54° | 69° | — | — |
| 2019 | 84° | 42° | 63° | — | — |
| 2018 | 65° | 39° | 52° | — | — |
| 2017 | 56° | 41° | 48° | — | — |
| 2016 | 78° | 40° | 59° | — | — |
| 2015 | 86° | 47° | 66° | — | — |
| 2014 | 87° | 48° | 68° | — | — |
| 2013 | 67° | 46° | 56° | — | — |
| 2012 | 65° | 50° | 57° | 1.3" | — |
| 2011 | 88° | 53° | 70° | — | — |
| 2010 | 87° | 47° | 67° | — | — |
| 2009 | 86° | 43° | 64° | — | — |
| 2008 | 86° | 54° | 70° | — | — |
| 2007 | 75° | 40° | 57° | — | — |
| 2006 | 79° | 40° | 59° | — | — |
| 2005 | 78° | 44° | 61° | — | — |
| 2004 | 77° | 43° | 60° | 0.25" | — |
| 2003 | 86° | 44° | 65° | — | — |
| 2002 | 63° | 37° | 50° | 0.3" | — |
| 2001 | 87° | 38° | 62° | — | — |
| 2000 | 62° | 24° | 43° | — | — |
| 1999 | 91° | 41° | 66° | — | — |
| 1998warmest | 88° | 55° | 71° | — | — |
| 1997 | 81° | 38° | 59° | — | — |
| 1996 | 67° | 28° | 47° | 1.27" | — |
| 1995 | 71° | 31° | 51° | — | — |
| 1994 | 79° | 41° | 60° | — | — |
| 1993 | 78° | 37° | 58° | — | — |
| 1992 | 72° | 37° | 54° | — | — |
| 1991 | 78° | 37° | 58° | — | — |
| 1990 | 85° | 47° | 66° | — | — |
| 1989 | 76° | 40° | 58° | — | — |
| 1988 | 83° | 38° | 60° | — | — |
| 1987 | 87° | 43° | 65° | — | — |
| 1986 | 76° | 36° | 56° | — | — |
| 1985 | 79° | 28° | 53° | — | — |
| 1984coldest | 53° | 28° | 41° | — | — |
| 1983 | 83° | 46° | 64° | — | — |
| 1982 | 63° | 47° | 55° | — | — |
| 1981 | 82° | 47° | 64° | — | — |
| 1980 | 68° | 40° | 54° | — | — |
| 1979 | 82° | 48° | 65° | — | — |
| 1978 | 79° | 42° | 60° | — | — |
| 1977 | 86° | 46° | 66° | — | — |
| 1976 | 70° | 49° | 59° | 0.25" | — |
| 1975 | 81° | 38° | 59° | — | — |
| 1974 | 83° | 42° | 62° | — | — |
| 1973 | 65° | 41° | 53° | 0.58" | — |
| 1972 | 59° | 38° | 48° | — | — |
| 1971 | 78° | 40° | 59° | — | — |
55 years of data from LONGMONT 2 ESE