Weather on September 3
Boulder, CO
55 Years of Data
Avg High
84°F
Avg Low
54°F
Warmest
1971
78°F avg
Coldest
1974
54°F avg
About This Date
September 3rd in Boulder, CO typically brings warm fall weather, with average highs around 84°F and lows near 54°F — a 30°F daily swing. Over 55 years of records, the warmest September 3rd was in 1971 (78°F average), while the coldest was 1974 (54°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 24% of September 3rd dates historically, with the wettest September 3rd recording 1.12" of rain. The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
Planning for September 3rd in Boulder, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 54° | 71° | — | — |
| 2024 | 91° | 57° | 74° | — | — |
| 2023 | 88° | 63° | 75° | — | — |
| 2022 | 90° | 61° | 75° | — | — |
| 2021 | 81° | 61° | 71° | 0.03" | — |
| 2020 | 70° | 63° | 66° | — | — |
| 2019 | 82° | 66° | 74° | — | — |
| 2018 | 81° | 59° | 70° | — | — |
| 2017 | 97° | 56° | 76° | — | — |
| 2016 | 88° | 52° | 70° | 0.08" | — |
| 2015 | 85° | 62° | 73° | 0.08" | — |
| 2014 | 93° | 53° | 73° | — | — |
| 2013 | 94° | 60° | 77° | — | — |
| 2012 | 89° | 60° | 75° | — | — |
| 2011 | 77° | 52° | 64° | — | — |
| 2010 | 79° | 40° | 59° | — | — |
| 2009 | 86° | 54° | 70° | — | — |
| 2008 | 71° | 42° | 57° | — | — |
| 2007 | 91° | 57° | 74° | — | — |
| 2006 | 74° | 40° | 57° | — | — |
| 2005 | 91° | 55° | 73° | — | — |
| 2004 | 80° | 52° | 66° | — | — |
| 2003 | 73° | 51° | 62° | 0.08" | — |
| 2002 | 86° | 52° | 69° | — | — |
| 2001 | 93° | 56° | 74° | — | — |
| 2000 | 84° | 50° | 67° | — | — |
| 1999 | 73° | 50° | 62° | 0.05" | — |
| 1998 | 92° | 61° | 76° | — | — |
| 1997 | 81° | 57° | 69° | — | — |
| 1996 | 91° | 55° | 73° | — | — |
| 1995 | 93° | 57° | 75° | 0.13" | — |
| 1994 | 79° | 58° | 68° | — | — |
| 1993 | 79° | 40° | 59° | — | — |
| 1992 | 83° | 51° | 67° | — | — |
| 1991 | 75° | 58° | 66° | 0.13" | — |
| 1990 | 88° | 57° | 72° | 0.74" | — |
| 1989 | 91° | 48° | 70° | — | — |
| 1988 | 81° | 53° | 67° | — | — |
| 1987 | 90° | 64° | 77° | — | — |
| 1986 | 83° | 50° | 66° | — | — |
| 1985 | 83° | 56° | 69° | 0.15" | — |
| 1984 | 85° | 45° | 65° | — | — |
| 1983 | 90° | 63° | 76° | — | — |
| 1982 | 87° | 55° | 71° | — | — |
| 1981 | 72° | 54° | 63° | 1.12" | — |
| 1980 | 90° | 54° | 72° | — | — |
| 1979 | 81° | 44° | 62° | — | — |
| 1978 | 91° | 56° | 73° | — | — |
| 1977 | 86° | 53° | 70° | 0.13" | — |
| 1976 | 87° | 58° | 72° | — | — |
| 1975 | 78° | 51° | 65° | — | — |
| 1974coldest | 69° | 39° | 54° | 0.05" | — |
| 1973 | 80° | 41° | 61° | — | — |
| 1972 | 73° | 48° | 61° | 0.15" | — |
| 1971warmest | 87° | 69° | 78° | — | — |
55 years of data from BOULDER MUNI AP