Weather on September 29
Longmont, CO
55 Years of Data
Avg High
73°F
Avg Low
41°F
Warmest
2010
70°F avg
Coldest
1985
27°F avg
About This Date
September 29th in Longmont, CO typically brings pleasant fall weather, with average highs around 73°F and lows near 41°F — a 32°F daily swing. Over 55 years of records, the warmest September 29th was in 2010 (70°F average), while the coldest was 1985 (27°F) — a 43°F range across recorded history. Precipitation has occurred on 15% of recorded September 29th dates, with snow falling 2% of the time. The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
Planning for September 29th in Longmont, CO? Great weather for outdoor activities.
Warming Trend
1.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 55° | 66° | — | — |
| 2024 | 88° | 51° | 69° | — | — |
| 2023 | 88° | 48° | 68° | — | — |
| 2022 | 83° | 47° | 65° | — | — |
| 2021 | 83° | 53° | 68° | — | — |
| 2020 | 64° | 36° | 50° | — | — |
| 2019 | 70° | 49° | 59° | — | — |
| 2018 | 49° | 38° | 43° | — | — |
| 2017 | 57° | 44° | 51° | 0.1" | — |
| 2016 | 81° | 43° | 62° | — | — |
| 2015 | 79° | 54° | 66° | 0.2" | — |
| 2014 | 67° | 51° | 59° | 1.12" | — |
| 2013 | 74° | 42° | 58° | — | — |
| 2012 | 77° | 42° | 60° | — | — |
| 2011 | 69° | 50° | 60° | — | — |
| 2010warmest | 85° | 55° | 70° | — | — |
| 2009 | 87° | 41° | 64° | — | — |
| 2008 | 73° | 40° | 56° | — | — |
| 2007 | 76° | 49° | 62° | — | — |
| 2006 | 85° | 49° | 67° | — | — |
| 2005 | 78° | 37° | 58° | — | — |
| 2004 | 66° | 42° | 54° | — | — |
| 2003 | 80° | 39° | 60° | — | — |
| 2002 | 72° | 38° | 55° | — | — |
| 2001 | 84° | 48° | 66° | — | — |
| 2000 | 82° | 35° | 59° | — | — |
| 1999 | 46° | 21° | 34° | 0.94" | — |
| 1998 | 90° | 39° | 64° | — | — |
| 1997 | 76° | 35° | 55° | — | — |
| 1996 | 71° | 40° | 55° | — | — |
| 1995 | 74° | 44° | 59° | — | — |
| 1994 | 92° | 43° | 67° | — | — |
| 1993 | 70° | 34° | 52° | — | — |
| 1992 | 73° | 39° | 56° | — | — |
| 1991 | 87° | 44° | 66° | — | — |
| 1990 | 62° | 43° | 52° | — | — |
| 1989 | 83° | 41° | 62° | — | — |
| 1988 | 64° | 29° | 46° | — | — |
| 1987 | 58° | 38° | 48° | — | — |
| 1986 | 72° | 38° | 55° | 0.03" | — |
| 1985coldest | 36° | 19° | 27° | 0.28" | 0.8" |
| 1984 | 35° | 29° | 32° | 0.3" | — |
| 1983 | 78° | 45° | 61° | — | — |
| 1982 | 70° | 36° | 53° | — | — |
| 1981 | 89° | 46° | 68° | — | — |
| 1980 | 85° | 46° | 65° | — | — |
| 1979 | 82° | 45° | 63° | — | — |
| 1978 | 75° | 47° | 61° | — | — |
| 1977 | 86° | 47° | 66° | — | — |
| 1976 | 63° | 35° | 49° | — | — |
| 1975 | 77° | 34° | 55° | — | — |
| 1974 | 70° | 34° | 52° | — | — |
| 1973 | 55° | 40° | 47° | 2.41" | — |
| 1972 | 67° | 38° | 52° | — | — |
| 1971 | 66° | 37° | 52° | — | — |
55 years of data from LONGMONT 2 ESE