Weather on September 20
Denver, CO
55 Years of Data
Avg High
77°F
Avg Low
46°F
Warmest
2022
74°F avg
Coldest
1983
41°F avg
About This Date
September 20th in Denver, CO typically brings pleasant fall weather, with average highs around 77°F and lows near 46°F — a 31°F daily swing. Over 55 years of records, the warmest September 20th was in 2022 (74°F average), while the coldest was 1983 (41°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 27% of September 20th dates historically, with the wettest September 20th recording 1.73" of rain. The last decade has been 11.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 11.1°F warmer on this date compared to 20-30 years ago.
Planning for September 20th in Denver, CO? Great weather for outdoor activities.
Warming Trend
2.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 51° | 68° | — | — |
| 2024 | 87° | 50° | 69° | — | — |
| 2023 | 88° | 41° | 64° | 0.08" | — |
| 2022warmest | 95° | 54° | 74° | — | — |
| 2021 | 89° | 53° | 71° | — | — |
| 2020 | 87° | 55° | 71° | — | — |
| 2019 | 90° | 51° | 70° | — | — |
| 2018 | 85° | 58° | 71° | 0.94" | — |
| 2017 | 90° | 45° | 67° | — | — |
| 2016 | 90° | 57° | 73° | — | — |
| 2015 | 79° | 41° | 60° | — | — |
| 2014 | 87° | 56° | 71° | — | — |
| 2013 | 85° | 46° | 65° | — | — |
| 2012 | 82° | 46° | 64° | — | — |
| 2011 | 63° | 42° | 52° | — | — |
| 2010 | 93° | 45° | 69° | — | — |
| 2009 | 81° | 51° | 66° | — | — |
| 2008 | 82° | 47° | 64° | — | — |
| 2007 | 86° | 48° | 67° | — | — |
| 2006 | 80° | 40° | 60° | — | — |
| 2005 | 84° | 46° | 65° | — | — |
| 2004 | 82° | 52° | 67° | — | — |
| 2003 | 78° | 34° | 56° | — | — |
| 2002 | 84° | 41° | 63° | — | — |
| 2001 | 85° | 50° | 67° | — | — |
| 2000 | 55° | 41° | 48° | 1.73" | — |
| 1999 | 51° | 43° | 47° | 0.25" | — |
| 1998 | 92° | 50° | 71° | 0.28" | — |
| 1997 | 56° | 41° | 48° | 0.05" | — |
| 1996 | 65° | 46° | 55° | — | — |
| 1995 | 54° | 43° | 48° | 0.23" | — |
| 1994 | 75° | 51° | 63° | — | — |
| 1993 | 76° | 44° | 60° | — | — |
| 1992 | 81° | 54° | 67° | — | — |
| 1991 | 79° | 42° | 60° | — | — |
| 1990 | 71° | 48° | 60° | 0.74" | — |
| 1989 | 78° | 51° | 65° | — | — |
| 1988 | 87° | 37° | 62° | — | — |
| 1987 | 70° | 43° | 56° | — | — |
| 1986 | 70° | 45° | 57° | — | — |
| 1985 | 57° | 42° | 50° | 0.05" | — |
| 1984 | 77° | 52° | 64° | 0.08" | — |
| 1983coldest | 54° | 28° | 41° | 0.25" | — |
| 1982 | 72° | 49° | 60° | — | — |
| 1981 | 86° | 51° | 69° | — | — |
| 1980 | 86° | 49° | 67° | 0.99" | — |
| 1979 | 72° | 51° | 61° | — | — |
| 1978 | 53° | 36° | 44° | 0.03" | — |
| 1977 | 88° | 45° | 66° | — | — |
| 1976 | 67° | 51° | 59° | 0.2" | — |
| 1975 | 61° | 29° | 45° | — | — |
| 1974 | 64° | 39° | 52° | — | — |
| 1973 | 86° | 46° | 66° | — | — |
| 1972 | 71° | 50° | 61° | — | — |
| 1971 | 65° | 37° | 51° | 0.05" | — |
55 years of data from NORTHGLENN