Weather on August 21
Denver, CO
55 Years of Data
Avg High
85°F
Avg Low
57°F
Warmest
2013
80°F avg
Coldest
1979
60°F avg
About This Date
August 21st in Denver, CO typically brings warm summer weather, with average highs around 85°F and lows near 57°F — a 28°F daily swing. Over 55 years of records, the warmest August 21st was in 2013 (80°F average), while the coldest was 1979 (60°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 22% of August 21st dates historically, with the wettest August 21st recording 2.95" of rain. The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Denver, CO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 56° | 76° | — | — |
| 2024 | 93° | 66° | 80° | — | — |
| 2023 | 92° | 64° | 78° | — | — |
| 2022 | 79° | 55° | 67° | 0.08" | — |
| 2021 | 78° | 55° | 67° | — | — |
| 2020 | 87° | 63° | 75° | — | — |
| 2019 | 94° | 62° | 78° | — | — |
| 2018 | 76° | 54° | 65° | — | — |
| 2017 | 85° | 60° | 72° | — | — |
| 2016 | 73° | 48° | 61° | — | — |
| 2015 | 85° | 54° | 69° | — | — |
| 2014 | 84° | 56° | 70° | 1.17" | — |
| 2013warmest | 93° | 66° | 80° | — | — |
| 2012 | 79° | 55° | 67° | — | — |
| 2011 | 87° | 59° | 73° | — | — |
| 2010 | 90° | 60° | 75° | — | — |
| 2009 | 84° | 52° | 68° | — | — |
| 2008 | 88° | 62° | 75° | — | — |
| 2007 | 94° | 61° | 77° | — | — |
| 2006 | 86° | 55° | 71° | — | — |
| 2005 | 84° | 56° | 70° | 0.51" | — |
| 2004 | 74° | 50° | 62° | 0.28" | — |
| 2003 | 92° | 65° | 78° | — | — |
| 2002 | 84° | 45° | 64° | — | — |
| 2001 | 90° | 60° | 75° | 0.36" | — |
| 2000 | 83° | 56° | 69° | — | — |
| 1999 | 87° | 55° | 71° | — | — |
| 1998 | 83° | 57° | 70° | — | — |
| 1997 | 82° | 55° | 69° | — | — |
| 1996 | 84° | 58° | 71° | — | — |
| 1995 | 81° | 59° | 70° | 0.08" | — |
| 1994 | 80° | 53° | 67° | — | — |
| 1993 | 82° | 55° | 69° | 1.47" | — |
| 1992 | 92° | 58° | 75° | — | — |
| 1991 | 83° | 55° | 69° | — | — |
| 1990 | 80° | 54° | 67° | 0.2" | — |
| 1989 | 79° | 45° | 62° | — | — |
| 1988 | 88° | 62° | 75° | — | — |
| 1987 | 93° | 56° | 74° | — | — |
| 1986 | 75° | 56° | 65° | — | — |
| 1985 | 88° | 52° | 70° | — | — |
| 1984 | 78° | 56° | 67° | 1.96" | — |
| 1983 | 84° | 59° | 72° | 0.51" | — |
| 1982 | 81° | 56° | 68° | 2.95" | — |
| 1981 | 87° | 57° | 72° | — | — |
| 1980 | 80° | 54° | 67° | — | — |
| 1979coldest | 70° | 51° | 60° | — | — |
| 1978 | 86° | 58° | 72° | — | — |
| 1977 | 81° | 57° | 69° | — | — |
| 1976 | 87° | 56° | 71° | — | — |
| 1975 | 81° | 56° | 68° | — | — |
| 1974 | 85° | 49° | 67° | — | — |
| 1973 | 92° | 65° | 78° | — | — |
| 1972 | 86° | 58° | 72° | 0.13" | — |
| 1971 | 91° | 60° | 76° | — | — |
55 years of data from LAKEWOOD