Weather on September 5
Longmont, CO
55 Years of Data
Avg High
86°F
Avg Low
51°F
Warmest
2010
79°F avg
Coldest
1971
57°F avg
About This Date
September 5th in Longmont, CO typically brings warm fall weather, with average highs around 86°F and lows near 51°F — a 35°F daily swing. Over 55 years of records, the warmest September 5th was in 2010 (79°F average), while the coldest was 1971 (57°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 18% of September 5th dates historically, with the wettest September 5th recording 2.29" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 5th in Longmont, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 51° | 69° | — | — |
| 2024 | 83° | 54° | 68° | 0.13" | — |
| 2023 | 87° | 51° | 69° | — | — |
| 2022 | 95° | 56° | 75° | — | — |
| 2021 | 84° | 49° | 66° | — | — |
| 2020 | 90° | 52° | 71° | — | — |
| 2019 | 87° | 58° | 72° | — | — |
| 2018 | 82° | 55° | 69° | 0.61" | — |
| 2017 | 87° | 57° | 72° | — | — |
| 2016 | 89° | 50° | 70° | — | — |
| 2015 | 88° | 60° | 74° | 0.03" | — |
| 2014 | 66° | 49° | 57° | 2.29" | — |
| 2013 | 94° | 59° | 76° | — | — |
| 2012 | 88° | 50° | 69° | — | — |
| 2011 | 87° | 45° | 66° | — | — |
| 2010warmest | 93° | 64° | 79° | — | — |
| 2009 | 85° | 49° | 67° | — | — |
| 2008 | 70° | 45° | 57° | 0.18" | — |
| 2007 | 83° | 58° | 70° | 0.1" | — |
| 2006 | 80° | 45° | 62° | — | — |
| 2005 | 90° | 59° | 74° | 0.03" | — |
| 2004 | 86° | 46° | 66° | 1.4" | — |
| 2003 | 83° | 54° | 68° | — | — |
| 2002 | 93° | 46° | 70° | — | — |
| 2001 | 94° | 45° | 69° | — | — |
| 2000 | 92° | 53° | 72° | — | — |
| 1999 | 76° | 46° | 61° | — | — |
| 1998 | 98° | 51° | 75° | — | — |
| 1997 | 87° | 49° | 68° | 0.3" | — |
| 1996 | 93° | 46° | 70° | — | — |
| 1995 | 96° | 53° | 75° | — | — |
| 1994 | 92° | 51° | 71° | — | — |
| 1993 | 86° | 49° | 67° | — | — |
| 1992 | 88° | — | — | — | — |
| 1991 | 86° | 53° | 70° | — | — |
| 1990 | 89° | 54° | 71° | — | — |
| 1989 | 83° | 48° | 65° | — | — |
| 1988 | 80° | 39° | 60° | — | — |
| 1987 | 80° | — | — | — | — |
| 1986 | 82° | 49° | 65° | — | — |
| 1985 | 89° | 50° | 70° | — | — |
| 1984 | 83° | 44° | 63° | — | — |
| 1983 | 84° | 51° | 68° | 0.03" | — |
| 1982 | 95° | 55° | 75° | — | — |
| 1981 | 84° | 52° | 68° | — | — |
| 1980 | 86° | 51° | 69° | — | — |
| 1979 | 92° | 51° | 71° | — | — |
| 1978 | 94° | 53° | 73° | — | — |
| 1977 | 85° | 50° | 67° | — | — |
| 1976 | 92° | 51° | 71° | — | — |
| 1975 | 83° | 44° | 63° | — | — |
| 1974 | 81° | 44° | 62° | — | — |
| 1973 | 80° | 43° | 61° | — | — |
| 1972 | 82° | 50° | 66° | — | — |
| 1971coldest | 70° | 45° | 57° | — | — |
55 years of data from LONGMONT 2 ESE