Weather on August 21
Arvada, CO
55 Years of Data
Avg High
84°F
Avg Low
56°F
Warmest
2013
82°F avg
Coldest
2004
55°F avg
About This Date
August 21st in Arvada, CO typically brings warm summer weather, with average highs around 84°F and lows near 56°F — a 28°F daily swing. Over 55 years of records, the warmest August 21st was in 2013 (82°F average), while the coldest was 2004 (55°F) — a 27°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 5.72" of rain. The last decade has been 5.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.0°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Arvada, CO? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 94° | 64° | 79° | — | — |
| 2024 | 93° | 70° | 81° | — | — |
| 2023 | 94° | 59° | 76° | — | — |
| 2022 | 80° | 56° | 68° | 0.08" | — |
| 2021 | 79° | 52° | 65° | — | — |
| 2020 | 90° | 55° | 72° | — | — |
| 2019 | 94° | 62° | 78° | — | — |
| 2018 | 79° | 50° | 64° | — | — |
| 2017 | 91° | 58° | 74° | — | — |
| 2016 | 76° | 46° | 61° | — | — |
| 2015 | 88° | 53° | 70° | — | — |
| 2014 | 84° | 53° | 69° | 0.08" | — |
| 2013warmest | 95° | 68° | 82° | — | — |
| 2012 | 81° | 57° | 69° | — | — |
| 2011 | 80° | 53° | 67° | — | — |
| 2010 | 79° | 53° | 66° | — | — |
| 2009 | 74° | 46° | 60° | — | — |
| 2008 | 79° | 52° | 65° | — | — |
| 2007 | 83° | 55° | 69° | — | — |
| 2006 | 67° | 50° | 58° | — | — |
| 2005 | 70° | 47° | 58° | — | — |
| 2004coldest | 68° | 43° | 55° | — | — |
| 2003 | 80° | 60° | 70° | — | — |
| 2002 | 72° | 48° | 60° | — | — |
| 2001 | 88° | 59° | 73° | — | — |
| 2000 | 85° | 46° | 65° | 0.41" | — |
| 1999 | 84° | 54° | 69° | — | — |
| 1998 | 82° | 62° | 72° | — | — |
| 1997 | 82° | 55° | 69° | 0.05" | — |
| 1996 | 93° | 60° | 77° | 0.05" | — |
| 1995 | 87° | 53° | 70° | — | — |
| 1994 | 84° | 54° | 69° | — | — |
| 1993 | 83° | 54° | 68° | 0.36" | — |
| 1992 | 83° | 60° | 71° | — | — |
| 1991 | 85° | 57° | 71° | — | — |
| 1990 | 87° | 55° | 71° | — | — |
| 1989 | 84° | 51° | 68° | — | — |
| 1988 | 93° | 61° | 77° | — | — |
| 1987 | 95° | 54° | 74° | — | — |
| 1986 | 84° | 50° | 67° | 0.05" | — |
| 1985 | 95° | 54° | 74° | — | — |
| 1984 | 81° | 57° | 69° | 1.45" | — |
| 1983 | 86° | 60° | 73° | 0.58" | — |
| 1982 | 86° | 59° | 73° | 5.72" | — |
| 1981 | 88° | 62° | 75° | — | — |
| 1980 | 80° | 48° | 64° | — | — |
| 1979 | 81° | 49° | 65° | — | — |
| 1978 | 90° | 64° | 77° | — | — |
| 1977 | 82° | 61° | 71° | — | — |
| 1976 | 89° | 62° | 76° | — | — |
| 1975 | 85° | 58° | 71° | 0.13" | — |
| 1974 | 79° | 50° | 64° | — | — |
| 1973 | 92° | 63° | 77° | 0.03" | — |
| 1972 | 77° | 57° | 67° | — | — |
| 1971 | 91° | 62° | 77° | — | — |
55 years of data from WATERTON NORTH COLORADO