Weather on September 14
Longmont, CO
55 Years of Data
Avg High
77°F
Avg Low
46°F
Warmest
1997
73°F avg
Coldest
1993
33°F avg
About This Date
September 14th in Longmont, CO typically brings pleasant fall weather, with average highs around 77°F and lows near 46°F — a 31°F daily swing. Over 55 years of records, the warmest September 14th was in 1997 (73°F average), while the coldest was 1993 (33°F) — a 40°F range across recorded history. Rain or other precipitation has occurred on about 29% of September 14th dates historically, with the wettest September 14th recording 2.72" of rain. The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
Planning for September 14th in Longmont, CO? Great weather for outdoor activities.
Warming Trend
1.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 52° | 63° | 0.71" | — |
| 2024 | 80° | 51° | 66° | — | — |
| 2023 | 79° | 47° | 63° | — | — |
| 2022 | 82° | 48° | 65° | — | — |
| 2021 | 84° | 55° | 70° | — | — |
| 2020 | 84° | 46° | 65° | — | — |
| 2019 | 80° | 46° | 63° | — | — |
| 2018 | 95° | 49° | 72° | — | — |
| 2017 | 86° | 56° | 71° | 0.03" | — |
| 2016 | 73° | 50° | 62° | 0.18" | — |
| 2015 | 89° | 56° | 72° | — | — |
| 2014 | 84° | 44° | 64° | — | — |
| 2013 | 74° | 55° | 64° | 0.03" | — |
| 2012 | 77° | 45° | 61° | — | — |
| 2011 | 74° | 50° | 62° | 0.1" | — |
| 2010 | 89° | 52° | 70° | — | — |
| 2009 | 82° | 50° | 66° | — | — |
| 2008 | 69° | 43° | 56° | 0.51" | — |
| 2007 | 66° | 44° | 55° | — | — |
| 2006 | 86° | 52° | 69° | — | — |
| 2005 | 64° | 41° | 53° | 0.43" | — |
| 2004 | 87° | 52° | 69° | — | — |
| 2003 | 82° | 37° | 60° | — | — |
| 2002 | 72° | 51° | 61° | 0.1" | — |
| 2001 | 84° | 44° | 64° | 0.33" | — |
| 2000 | 92° | 44° | 68° | — | — |
| 1999 | 69° | 35° | 52° | — | — |
| 1998 | 79° | 43° | 61° | — | — |
| 1997warmest | 89° | 57° | 73° | 1.02" | — |
| 1996 | 69° | 49° | 59° | 0.1" | — |
| 1995 | 85° | 46° | 65° | — | — |
| 1994 | 90° | 52° | 71° | 0.25" | — |
| 1993coldest | 39° | 27° | 33° | 1.19" | — |
| 1992 | 89° | — | — | — | — |
| 1991 | 74° | 46° | 60° | — | — |
| 1990 | 97° | 47° | 72° | — | — |
| 1989 | 58° | 34° | 46° | — | — |
| 1988 | 52° | 41° | 46° | 0.36" | — |
| 1987 | 88° | 50° | 69° | — | — |
| 1986 | 63° | 44° | 53° | — | — |
| 1985 | 84° | 50° | 67° | — | — |
| 1984 | 70° | 45° | 57° | — | — |
| 1983 | 79° | 47° | 63° | — | — |
| 1982 | 55° | 32° | 44° | 2.72" | — |
| 1981 | 89° | 50° | 70° | — | — |
| 1980 | 74° | 49° | 61° | — | — |
| 1979 | 67° | 43° | 55° | 0.46" | — |
| 1978 | 77° | 44° | 61° | — | — |
| 1977 | 75° | 42° | 59° | — | — |
| 1976 | 72° | 50° | 61° | — | — |
| 1975 | 64° | 46° | 55° | — | — |
| 1974 | 58° | 37° | 47° | — | — |
| 1973 | 79° | 45° | 62° | — | — |
| 1972 | 73° | 47° | 60° | — | — |
| 1971 | 94° | 43° | 68° | — | — |
55 years of data from LONGMONT 2 ESE