Weather on August 21
Ann Arbor, MI
55 Years of Data
Avg High
80°F
Avg Low
58°F
Warmest
1971
79°F avg
Coldest
2024
56°F avg
About This Date
August 21st in Ann Arbor, MI typically brings warm summer weather, with average highs around 80°F and lows near 58°F. Over 55 years of records, the warmest August 21st was in 1971 (79°F average), while the coldest was 2024 (56°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 31% of August 21st dates historically, with the wettest August 21st recording 4.65" of rain. The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Ann Arbor, MI? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Cooling Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 54° | 64° | — | — |
| 2024coldest | 74° | 38° | 56° | — | — |
| 2023 | 83° | 63° | 73° | — | — |
| 2022 | 81° | 60° | 70° | 4.65" | — |
| 2021 | 87° | 60° | 74° | — | — |
| 2020 | 88° | 51° | 69° | — | — |
| 2019 | 88° | 64° | 76° | — | — |
| 2018 | 82° | 67° | 74° | — | — |
| 2017 | 88° | 59° | 73° | — | — |
| 2016 | 78° | 53° | 66° | 0.2" | — |
| 2015 | 78° | 49° | 63° | — | — |
| 2014 | 83° | 59° | 71° | 0.28" | — |
| 2013 | 85° | 57° | 71° | — | — |
| 2012 | 77° | 51° | 64° | — | — |
| 2011 | 83° | 63° | 73° | 0.71" | — |
| 2010 | 86° | 67° | 76° | — | — |
| 2009 | 80° | 61° | 70° | 0.76" | — |
| 2008 | 79° | 54° | 66° | — | — |
| 2007 | 75° | 59° | 67° | — | — |
| 2006 | 81° | 47° | 64° | — | — |
| 2005 | 82° | 54° | 68° | 0.03" | — |
| 2004 | 71° | 45° | 58° | — | — |
| 2003 | 90° | 56° | 73° | 2.72" | — |
| 2002 | 82° | 51° | 67° | — | — |
| 2001 | 80° | 52° | 66° | — | — |
| 2000 | 72° | 47° | 59° | 0.03" | — |
| 1999 | 81° | 49° | 65° | — | — |
| 1998 | 88° | 69° | 78° | — | — |
| 1997 | 68° | 57° | 63° | 0.05" | — |
| 1996 | 85° | 66° | 75° | 0.03" | — |
| 1995 | 86° | 65° | 75° | — | — |
| 1994 | 74° | 62° | 68° | 0.05" | — |
| 1993 | 76° | 58° | 67° | — | — |
| 1992 | 77° | 50° | 64° | — | — |
| 1991 | 78° | 53° | 66° | — | — |
| 1990 | 68° | 62° | 65° | 0.89" | — |
| 1989 | 81° | 65° | 73° | — | — |
| 1988 | 77° | 56° | 66° | — | — |
| 1987 | 81° | 61° | 71° | 0.51" | — |
| 1986 | 84° | 63° | 73° | — | — |
| 1985 | 70° | 57° | 63° | — | — |
| 1984 | 80° | 53° | 67° | — | — |
| 1983 | 86° | 60° | 73° | — | — |
| 1982 | 82° | 57° | 70° | — | — |
| 1981 | 80° | 57° | 69° | — | — |
| 1980 | 82° | 69° | 76° | 1.47" | — |
| 1979 | 78° | 57° | 68° | 0.13" | — |
| 1978 | 80° | 51° | 66° | — | — |
| 1977 | 68° | 57° | 63° | 0.3" | — |
| 1976 | 87° | 60° | 74° | — | — |
| 1975 | 77° | 60° | 69° | 1.68" | — |
| 1974 | 87° | 67° | 77° | — | — |
| 1973 | 78° | 52° | 65° | — | — |
| 1972 | 86° | 63° | 74° | — | — |
| 1971warmest | 87° | 71° | 79° | — | — |
55 years of data from ANN ARBOR 1W