Weather on September 7
Boulder, CO
55 Years of Data
Avg High
81°F
Avg Low
53°F
Warmest
2022
79°F avg
Coldest
1986
49°F avg
About This Date
September 7th in Boulder, CO typically brings warm fall weather, with average highs around 81°F and lows near 53°F — a 28°F daily swing. Over 55 years of records, the warmest September 7th was in 2022 (79°F average), while the coldest was 1986 (49°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 29% of September 7th dates historically, with the wettest September 7th recording 2.59" of rain. The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
Planning for September 7th in Boulder, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 57° | 72° | — | — |
| 2024 | 86° | 55° | 71° | — | — |
| 2023 | 91° | 55° | 73° | — | — |
| 2022warmest | 95° | 63° | 79° | — | — |
| 2021 | 84° | 55° | 70° | — | — |
| 2020 | 70° | 61° | 65° | — | — |
| 2019 | 90° | 63° | 76° | — | — |
| 2018 | 73° | 52° | 62° | — | — |
| 2017 | 85° | 48° | 66° | — | — |
| 2016 | 84° | 51° | 68° | — | — |
| 2015 | 81° | 53° | 67° | 0.05" | — |
| 2014 | 83° | 49° | 66° | — | — |
| 2013 | 93° | 60° | 77° | — | — |
| 2012 | 86° | 52° | 69° | 0.3" | — |
| 2011 | 66° | 52° | 59° | 2.59" | — |
| 2010 | 79° | 39° | 59° | — | — |
| 2009 | 89° | 54° | 71° | — | — |
| 2008 | 74° | 43° | 58° | — | — |
| 2007 | 80° | 49° | 64° | — | — |
| 2006 | 80° | 50° | 65° | 0.13" | — |
| 2005 | 87° | 53° | 70° | — | — |
| 2004 | 83° | 46° | 64° | — | — |
| 2003 | 71° | 57° | 64° | 0.03" | — |
| 2002 | 89° | 60° | 75° | — | — |
| 2001 | 70° | 46° | 58° | 0.58" | — |
| 2000 | 80° | 45° | 62° | — | — |
| 1999 | 83° | 54° | 68° | — | — |
| 1998 | 88° | 55° | 71° | — | — |
| 1997 | 83° | 54° | 68° | — | — |
| 1996 | 76° | 45° | 60° | — | — |
| 1995 | 68° | 47° | 57° | 0.36" | — |
| 1994 | 83° | 59° | 71° | 0.03" | — |
| 1993 | 69° | 48° | 59° | 0.69" | — |
| 1992 | 73° | 47° | 60° | — | — |
| 1991 | 83° | 56° | 69° | 0.2" | — |
| 1990 | 82° | 57° | 70° | — | — |
| 1989 | 86° | 55° | 71° | — | — |
| 1988 | 93° | 56° | 74° | — | — |
| 1987 | 71° | 48° | 60° | 0.28" | — |
| 1986coldest | 53° | 44° | 49° | 0.94" | — |
| 1985 | 82° | 52° | 67° | — | — |
| 1984 | 81° | 58° | 69° | 0.05" | — |
| 1983 | 93° | 48° | 71° | — | — |
| 1982 | 79° | 51° | 65° | — | — |
| 1981 | 64° | 54° | 59° | 0.79" | — |
| 1980 | 88° | 56° | 72° | — | — |
| 1979 | 77° | 45° | 61° | — | — |
| 1978 | 90° | 54° | 72° | — | — |
| 1977 | 91° | 59° | 75° | — | — |
| 1976 | 86° | 55° | 71° | 0.28" | — |
| 1975 | 86° | 54° | 70° | — | — |
| 1974 | 87° | 51° | 69° | — | — |
| 1973 | 84° | 50° | 67° | — | — |
| 1972 | 73° | 54° | 63° | 0.13" | — |
| 1971 | 89° | 58° | 73° | — | — |
55 years of data from BOULDER MUNI AP