Weather on September 15
Denver, CO
55 Years of Data
Avg High
79°F
Avg Low
48°F
Warmest
1990
75°F avg
Coldest
1973
49°F avg
About This Date
September 15th in Denver, CO typically brings pleasant fall weather, with average highs around 79°F and lows near 48°F — a 31°F daily swing. Over 55 years of records, the warmest September 15th was in 1990 (75°F average), while the coldest was 1973 (49°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 18% of September 15th dates historically, with the wettest September 15th recording 4.19" of rain. The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
Planning for September 15th in Denver, CO? Great weather for outdoor activities.
Warming Trend
1.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 50° | 64° | — | — |
| 2024 | 91° | 50° | 71° | — | — |
| 2023 | 78° | 50° | 64° | 4.19" | — |
| 2022 | 94° | 53° | 73° | — | — |
| 2021 | 81° | 48° | 64° | — | — |
| 2020 | 88° | 51° | 69° | — | — |
| 2019 | 91° | 51° | 71° | — | — |
| 2018 | 93° | 53° | 73° | — | — |
| 2017 | 92° | 51° | 71° | — | — |
| 2016 | 81° | 39° | 60° | 0.05" | — |
| 2015 | 89° | 57° | 73° | — | — |
| 2014 | 84° | 48° | 66° | — | — |
| 2013 | 77° | 57° | 67° | — | — |
| 2012 | 78° | 46° | 62° | — | — |
| 2011 | 59° | 49° | 54° | 1.85" | — |
| 2010 | 93° | 51° | 72° | — | — |
| 2009 | 84° | 47° | 65° | — | — |
| 2008 | 67° | 44° | 55° | — | — |
| 2007 | 71° | 45° | 58° | — | — |
| 2006 | 91° | 55° | 73° | — | — |
| 2005 | 70° | 48° | 59° | — | — |
| 2004 | 89° | 41° | 65° | 0.15" | — |
| 2003 | 74° | 39° | 56° | — | — |
| 2002 | 87° | 47° | 67° | — | — |
| 2001 | 73° | 55° | 64° | — | — |
| 2000 | 94° | 49° | 71° | — | — |
| 1999 | 68° | 42° | 55° | — | — |
| 1998 | 83° | 53° | 68° | — | — |
| 1997 | 91° | 53° | 72° | — | — |
| 1996 | 74° | 53° | 63° | — | — |
| 1995 | 80° | 49° | 64° | 0.08" | — |
| 1994 | 75° | 52° | 63° | — | — |
| 1993 | 77° | 37° | 57° | — | — |
| 1992 | 87° | 56° | 71° | — | — |
| 1991 | 68° | 45° | 56° | — | — |
| 1990warmest | 94° | 56° | 75° | — | — |
| 1989 | 82° | 44° | 63° | — | — |
| 1988 | 70° | 35° | 52° | — | — |
| 1987 | 67° | 48° | 57° | 0.08" | — |
| 1986 | 74° | 52° | 63° | — | — |
| 1985 | 81° | 54° | 67° | — | — |
| 1984 | 59° | 46° | 53° | 0.03" | — |
| 1983 | 75° | 46° | 61° | — | — |
| 1982 | 64° | 45° | 54° | 0.81" | — |
| 1981 | 78° | 46° | 62° | — | — |
| 1980 | 87° | 50° | 69° | — | — |
| 1979 | 78° | 36° | 57° | — | — |
| 1978 | 88° | 44° | 66° | — | — |
| 1977 | 82° | 47° | 64° | — | — |
| 1976 | 73° | 44° | 59° | 0.1" | — |
| 1975 | 84° | 46° | 65° | — | — |
| 1974 | 69° | 45° | 57° | — | — |
| 1973coldest | 55° | 43° | 49° | 0.05" | — |
| 1972 | 83° | 50° | 66° | — | — |
| 1971 | 69° | 35° | 52° | — | — |
55 years of data from NORTHGLENN