Weather on September 11
Denver, CO
55 Years of Data
Avg High
81°F
Avg Low
50°F
Warmest
2005
81°F avg
Coldest
1989
38°F avg
About This Date
September 11th in Denver, CO typically brings warm fall weather, with average highs around 81°F and lows near 50°F — a 31°F daily swing. Over 55 years of records, the warmest September 11th was in 2005 (81°F average), while the coldest was 1989 (38°F) — a 43°F range across recorded history. Rain or other precipitation has occurred on about 27% of September 11th dates historically, with the wettest September 11th recording 2.01" 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 11th in Denver, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 94° | 52° | 73° | — | — |
| 2024 | 93° | 54° | 73° | — | — |
| 2023 | 69° | 51° | 60° | 0.99" | — |
| 2022 | 51° | 43° | 47° | 0.15" | — |
| 2021 | 101° | 59° | 80° | — | — |
| 2020 | — | 38° | — | — | — |
| 2019 | 88° | 55° | 71° | — | — |
| 2018 | 92° | 56° | 74° | — | — |
| 2017 | 91° | 59° | 75° | — | — |
| 2016 | 84° | 46° | 65° | — | — |
| 2015 | 91° | 53° | 72° | — | — |
| 2014 | 75° | 45° | 60° | 0.18" | — |
| 2013 | 65° | 57° | 61° | 2.01" | — |
| 2012 | 94° | 58° | 76° | — | — |
| 2011 | 78° | 46° | 62° | — | — |
| 2010 | 87° | 45° | 66° | — | — |
| 2009 | 89° | 56° | 72° | — | — |
| 2008 | 83° | 52° | 67° | — | — |
| 2007 | 60° | 40° | 50° | 0.15" | — |
| 2006 | 75° | 50° | 63° | 0.43" | — |
| 2005warmest | 94° | 69° | 81° | — | — |
| 2004 | 84° | 51° | 68° | — | — |
| 2003 | 78° | 44° | 61° | — | — |
| 2002 | 75° | 53° | 64° | 0.33" | — |
| 2001 | 92° | 50° | 71° | — | — |
| 2000 | 81° | 54° | 67° | — | — |
| 1999 | 78° | 51° | 65° | — | — |
| 1998 | 91° | 61° | 76° | — | — |
| 1997 | 88° | — | — | — | — |
| 1996 | 77° | 51° | 64° | 0.76" | — |
| 1995 | 72° | 48° | 60° | — | — |
| 1994 | 87° | 58° | 72° | — | — |
| 1993 | 90° | 55° | 72° | — | — |
| 1992 | 88° | 45° | 66° | — | — |
| 1991 | 82° | 51° | 67° | 0.05" | — |
| 1990 | 90° | 52° | 71° | — | — |
| 1989coldest | 40° | 36° | 38° | 0.74" | — |
| 1988 | 75° | 46° | 61° | 1.57" | — |
| 1987 | 69° | 42° | 56° | — | — |
| 1986 | 74° | 42° | 58° | — | — |
| 1985 | 72° | 51° | 61° | 0.33" | — |
| 1984 | 70° | 54° | 62° | — | — |
| 1983 | 89° | 46° | 68° | — | — |
| 1982 | 75° | 47° | 61° | — | — |
| 1981 | 80° | 51° | 66° | — | — |
| 1980 | 82° | 50° | 66° | — | — |
| 1979 | 80° | 49° | 64° | — | — |
| 1978 | 79° | 50° | 64° | — | — |
| 1977 | 81° | 57° | 69° | — | — |
| 1976 | 89° | 52° | 70° | — | — |
| 1975 | 66° | 42° | 54° | 0.46" | — |
| 1974 | 85° | 45° | 65° | — | — |
| 1973 | 70° | 52° | 61° | 1.68" | — |
| 1972 | 75° | 49° | 62° | 0.05" | — |
| 1971 | 89° | 50° | 70° | — | — |
55 years of data from NORTHGLENN