Weather on October 21
Denver, CO
55 Years of Data
Avg High
68°F
Avg Low
36°F
Warmest
2023
65°F avg
Coldest
1984
27°F avg
About This Date
October 21st in Denver, CO typically brings mild fall weather, with average highs around 68°F and lows near 36°F — a 32°F daily swing. Over 55 years of records, the warmest October 21st was in 2023 (65°F average), while the coldest was 1984 (27°F) — a 38°F range across recorded history. Precipitation has occurred on 18% of recorded October 21st dates, with snow falling 2% of the time (heaviest snowfall: 2.6"). The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Denver, CO? Great weather for outdoor activities.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 65° | 34° | 49° | — | — |
| 2024 | 74° | 38° | 56° | — | — |
| 2023warmest | 90° | 40° | 65° | — | — |
| 2022 | 82° | 41° | 62° | — | — |
| 2021 | 61° | 27° | 44° | — | — |
| 2020 | 70° | 35° | 52° | 0.03" | — |
| 2019 | 51° | 30° | 41° | — | — |
| 2018 | 70° | 35° | 52° | — | — |
| 2017 | 80° | 44° | 62° | — | — |
| 2016 | 62° | 33° | 48° | — | — |
| 2015 | 76° | 46° | 61° | 2.11" | — |
| 2014 | 78° | 42° | 60° | — | — |
| 2013 | 47° | 29° | 38° | 0.38" | — |
| 2012 | 74° | 47° | 60° | — | — |
| 2011 | 74° | 38° | 56° | — | — |
| 2010 | 73° | 37° | 55° | — | — |
| 2009 | 52° | 33° | 42° | 0.48" | — |
| 2008 | 67° | 39° | 53° | 0.2" | — |
| 2007 | 82° | 37° | 60° | 0.33" | — |
| 2006 | 68° | 29° | 48° | 0.97" | 2.6" |
| 2005 | 71° | 42° | 57° | — | — |
| 2004 | 76° | 37° | 56° | — | — |
| 2003 | 85° | 40° | 62° | — | — |
| 2002 | 64° | 31° | 47° | — | — |
| 2001 | 60° | 34° | 47° | — | — |
| 2000 | 77° | 35° | 56° | — | — |
| 1999 | 75° | 37° | 56° | — | — |
| 1998 | 62° | 30° | 46° | — | — |
| 1997 | 58° | 36° | 47° | — | — |
| 1996 | 47° | 26° | 36° | 0.13" | — |
| 1995 | 73° | 46° | 60° | — | — |
| 1994 | 69° | 43° | 56° | — | — |
| 1993 | 64° | 30° | 47° | — | — |
| 1992 | 82° | 37° | 60° | — | — |
| 1991 | 76° | 39° | 57° | — | — |
| 1990 | 55° | 26° | 41° | — | — |
| 1989 | 73° | 43° | 58° | — | — |
| 1988 | 69° | 34° | 51° | — | — |
| 1987 | 72° | 25° | 48° | — | — |
| 1986 | 55° | 42° | 49° | — | — |
| 1985 | 70° | 35° | 52° | — | — |
| 1984coldest | 29° | 26° | 27° | — | — |
| 1983 | 66° | 31° | 48° | — | — |
| 1982 | 63° | 29° | 46° | — | — |
| 1981 | 65° | 31° | 48° | — | — |
| 1980 | 71° | 29° | 50° | — | — |
| 1979 | 55° | 36° | 45° | 1.85" | — |
| 1978 | 68° | 49° | 58° | — | — |
| 1977 | 71° | 46° | 59° | — | — |
| 1976 | 66° | 19° | 43° | — | — |
| 1975 | 81° | 37° | 59° | — | — |
| 1974 | 78° | 38° | 58° | — | — |
| 1973 | 77° | 37° | 57° | — | — |
| 1972 | 58° | 41° | 49° | 0.18" | — |
| 1971 | 65° | 31° | 48° | — | — |
55 years of data from NORTHGLENN