Weather on September 10
Longmont, CO
55 Years of Data
Avg High
81°F
Avg Low
49°F
Warmest
1979
76°F avg
Coldest
2020
39°F avg
About This Date
September 10th in Longmont, CO typically brings warm fall weather, with average highs around 81°F and lows near 49°F — a 32°F daily swing. Over 55 years of records, the warmest September 10th was in 1979 (76°F average), while the coldest was 2020 (39°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 25% of September 10th dates historically, with the wettest September 10th recording 2.59" of rain. The last decade has been 1.9°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.9°F cooler on this date compared to 20-30 years ago.
Planning for September 10th in Longmont, CO? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 52° | 67° | — | — |
| 2024 | 89° | 53° | 71° | — | — |
| 2023 | 85° | 54° | 69° | — | — |
| 2022 | 58° | 46° | 52° | 1.24" | — |
| 2021 | 93° | 50° | 72° | — | — |
| 2020coldest | 47° | 32° | 39° | 0.08" | — |
| 2019 | 86° | 55° | 71° | 0.05" | — |
| 2018 | 88° | 51° | 69° | — | — |
| 2017 | 92° | 55° | 73° | — | — |
| 2016 | 81° | 39° | 60° | — | — |
| 2015 | 90° | 50° | 70° | — | — |
| 2014 | 71° | 50° | 61° | 0.81" | — |
| 2013 | 65° | 57° | 61° | 2.59" | — |
| 2012 | 94° | 57° | 75° | — | — |
| 2011 | 77° | 45° | 61° | — | — |
| 2010 | 82° | 47° | 64° | — | — |
| 2009 | 87° | 52° | 69° | — | — |
| 2008 | 79° | 49° | 64° | 0.03" | — |
| 2007 | 61° | 45° | 53° | 0.36" | — |
| 2006 | 71° | 47° | 59° | 0.08" | — |
| 2005 | 88° | 59° | 73° | — | — |
| 2004 | 90° | 56° | 73° | — | — |
| 2003 | 74° | 52° | 63° | — | — |
| 2002 | 75° | 49° | 62° | 1.02" | — |
| 2001 | 73° | 40° | 56° | — | — |
| 2000 | 89° | 51° | 70° | — | — |
| 1999 | 81° | 39° | 60° | — | — |
| 1998 | 95° | 51° | 73° | — | — |
| 1997 | 80° | 46° | 63° | — | — |
| 1996 | 91° | 46° | 69° | — | — |
| 1995 | 71° | 50° | 61° | 0.1" | — |
| 1994 | 95° | 48° | 72° | — | — |
| 1993 | 80° | 43° | 61° | — | — |
| 1992 | 72° | — | — | — | — |
| 1991 | 79° | 52° | 65° | — | — |
| 1990 | 88° | 46° | 67° | — | — |
| 1989 | 53° | 40° | 46° | 0.08" | — |
| 1988 | 94° | 42° | 68° | — | — |
| 1987 | 80° | 46° | 63° | — | — |
| 1986 | 81° | 49° | 65° | — | — |
| 1985 | 71° | 52° | 61° | — | — |
| 1984 | 92° | 46° | 69° | — | — |
| 1983 | 90° | 54° | 72° | — | — |
| 1982 | 89° | 50° | 70° | — | — |
| 1981 | 89° | 50° | 70° | — | — |
| 1980 | 57° | 49° | 53° | 0.05" | — |
| 1979warmest | 96° | 56° | 76° | — | — |
| 1978 | 90° | 53° | 71° | — | — |
| 1977 | 76° | 43° | 59° | — | — |
| 1976 | 73° | 43° | 58° | — | — |
| 1975 | 87° | 46° | 67° | 0.1" | — |
| 1974 | 91° | 55° | 73° | — | — |
| 1973 | 76° | 52° | 64° | 0.08" | — |
| 1972 | 77° | 49° | 63° | — | — |
| 1971 | 85° | 50° | 67° | — | — |
55 years of data from LONGMONT 2 ESE