Weather on September 12
Denver, CO
55 Years of Data
Avg High
78°F
Avg Low
49°F
Warmest
2021
78°F avg
Coldest
1989
35°F avg
About This Date
September 12th in Denver, CO typically brings pleasant fall weather, with average highs around 78°F and lows near 49°F — a 29°F daily swing. Over 55 years of records, the warmest September 12th was in 2021 (78°F average), while the coldest was 1989 (35°F) — a 43°F range across recorded history. Precipitation has occurred on 27% of recorded September 12th dates, with snow falling 4% of the time. The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
Planning for September 12th in Denver, CO? Great weather for outdoor activities.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 92° | 59° | 75° | — | — |
| 2024 | 88° | 50° | 69° | — | — |
| 2023 | 69° | 45° | 57° | — | — |
| 2022 | 80° | 44° | 62° | — | — |
| 2021warmest | 97° | 59° | 78° | 0.13" | — |
| 2020 | 70° | 41° | 55° | — | — |
| 2019 | 82° | 55° | 69° | 0.15" | — |
| 2018 | 91° | 55° | 73° | — | — |
| 2017 | 89° | 55° | 72° | — | — |
| 2016 | 92° | 47° | 69° | — | — |
| 2015 | 77° | 50° | 64° | — | — |
| 2014 | 50° | 33° | 42° | 0.58" | — |
| 2013 | 68° | 57° | 63° | 4.78" | — |
| 2012 | 89° | 50° | 70° | 1.55" | — |
| 2011 | 86° | 53° | 70° | — | — |
| 2010 | 82° | 51° | 67° | — | — |
| 2009 | 75° | 51° | 63° | — | — |
| 2008 | 66° | 45° | 55° | 2.87" | — |
| 2007 | 79° | 41° | 60° | — | — |
| 2006 | 75° | 45° | 60° | 0.48" | — |
| 2005 | 91° | 51° | 71° | — | — |
| 2004 | 90° | 52° | 71° | — | — |
| 2003 | 74° | 47° | 60° | — | — |
| 2002 | 79° | 53° | 66° | 0.81" | — |
| 2001 | 88° | 48° | 68° | — | — |
| 2000 | 87° | 46° | 67° | — | — |
| 1999 | 58° | 46° | 52° | — | — |
| 1998 | 83° | 58° | 70° | 0.74" | — |
| 1997 | 89° | — | — | — | — |
| 1996 | 72° | 53° | 62° | 0.43" | — |
| 1995 | 76° | 50° | 63° | — | — |
| 1994 | 90° | 55° | 72° | — | — |
| 1993 | 92° | 49° | 70° | — | — |
| 1992 | 90° | 57° | 73° | — | — |
| 1991 | 78° | 51° | 65° | — | — |
| 1990 | 101° | 52° | 76° | — | — |
| 1989coldest | 38° | 32° | 35° | 0.94" | 1" |
| 1988 | 47° | 39° | 43° | 1.22" | — |
| 1987 | 80° | 43° | 61° | — | — |
| 1986 | 79° | 45° | 62° | — | — |
| 1985 | 73° | 48° | 61° | — | — |
| 1984 | 88° | 55° | 71° | — | — |
| 1983 | 83° | 43° | 63° | — | — |
| 1982 | 60° | 44° | 52° | 0.99" | — |
| 1981 | 88° | 50° | 69° | — | — |
| 1980 | 78° | 48° | 63° | — | — |
| 1979 | 63° | 48° | 55° | — | — |
| 1978 | 72° | 42° | 57° | — | — |
| 1977 | 76° | 53° | 64° | — | — |
| 1976 | 86° | 50° | 68° | — | — |
| 1975 | 60° | 45° | 52° | 0.03" | — |
| 1974 | 53° | 32° | 43° | 0.94" | 1" |
| 1973 | 75° | 47° | 61° | — | — |
| 1972 | 80° | 53° | 67° | — | — |
| 1971 | 81° | 57° | 69° | — | — |
55 years of data from NORTHGLENN