Weather on September 8
Boulder, CO
55 Years of Data
Avg High
81°F
Avg Low
51°F
Warmest
2022
80°F avg
Coldest
2020
33°F avg
About This Date
September 8th in Boulder, CO typically brings warm fall weather, with average highs around 81°F and lows near 51°F — a 30°F daily swing. Over 55 years of records, the warmest September 8th was in 2022 (80°F average), while the coldest was 2020 (33°F) — a 47°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 8th dates historically, with the wettest September 8th recording 3.33" 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 8th in Boulder, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 61° | 74° | — | — |
| 2024 | 88° | 55° | 71° | — | — |
| 2023 | 90° | 59° | 74° | — | — |
| 2022warmest | 99° | 61° | 80° | — | — |
| 2021 | 86° | 52° | 69° | — | — |
| 2020coldest | 34° | 32° | 33° | — | — |
| 2019 | 77° | 55° | 66° | — | — |
| 2018 | 81° | 52° | 66° | — | — |
| 2017 | 84° | 52° | 68° | — | — |
| 2016 | 91° | 48° | 70° | — | — |
| 2015 | 85° | 54° | 69° | — | — |
| 2014 | 83° | 57° | 70° | 0.03" | — |
| 2013 | 91° | 58° | 74° | — | — |
| 2012 | 80° | 46° | 63° | — | — |
| 2011 | 75° | 48° | 62° | — | — |
| 2010 | 82° | 50° | 66° | 0.43" | — |
| 2009 | 87° | 53° | 70° | — | — |
| 2008 | 70° | 41° | 55° | 0.61" | — |
| 2007 | 85° | 51° | 68° | — | — |
| 2006 | 64° | 51° | 58° | 0.15" | — |
| 2005 | 86° | 56° | 71° | — | — |
| 2004 | 87° | 50° | 69° | — | — |
| 2003 | 82° | 48° | 65° | — | — |
| 2002 | 86° | 58° | 72° | — | — |
| 2001 | 64° | 36° | 50° | 3.33" | — |
| 2000 | 83° | 56° | 69° | — | — |
| 1999 | 76° | 45° | 60° | — | — |
| 1998 | 89° | 54° | 71° | — | — |
| 1997 | 85° | 53° | 69° | — | — |
| 1996 | 85° | 50° | 67° | — | — |
| 1995 | 70° | 49° | 59° | 0.13" | — |
| 1994 | 87° | 50° | 69° | — | — |
| 1993 | 77° | 40° | 58° | 0.33" | — |
| 1992 | 85° | 40° | 62° | — | — |
| 1991 | 79° | 55° | 67° | — | — |
| 1990 | 83° | 52° | 67° | — | — |
| 1989 | 82° | 53° | 68° | 1.04" | — |
| 1988 | 85° | 53° | 69° | — | — |
| 1987 | 82° | 45° | 63° | — | — |
| 1986 | 84° | 48° | 66° | 0.41" | — |
| 1985 | 80° | 44° | 62° | — | — |
| 1984 | 84° | 42° | 63° | — | — |
| 1983 | 90° | 57° | 73° | — | — |
| 1982 | 80° | 53° | 67° | — | — |
| 1981 | 78° | 50° | 64° | — | — |
| 1980 | 82° | 61° | 71° | — | — |
| 1979 | 82° | 46° | 64° | — | — |
| 1978 | 87° | 57° | 72° | — | — |
| 1977 | 92° | 61° | 76° | — | — |
| 1976 | 58° | 42° | 50° | 0.66" | — |
| 1975 | 79° | 53° | 66° | — | — |
| 1974 | 83° | 54° | 68° | — | — |
| 1973 | 83° | 45° | 64° | 0.61" | — |
| 1972 | 78° | 48° | 63° | — | — |
| 1971 | 72° | 50° | 61° | 1.5" | — |
55 years of data from BOULDER MUNI AP