Weather on October 21
Ann Arbor, MI
55 Years of Data
Avg High
60°F
Avg Low
40°F
Warmest
1979
70°F avg
Coldest
1989
37°F avg
About This Date
October 21st in Ann Arbor, MI typically brings mild fall weather, with average highs around 60°F and lows near 40°F. Over 55 years of records, the warmest October 21st was in 1979 (70°F average), while the coldest was 1989 (37°F) — a 33°F range across recorded history. Precipitation has occurred on 47% of recorded October 21st dates, with snow falling 4% of the time. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Ann Arbor, MI? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 63° | 43° | 53° | 0.61" | — |
| 2024 | 79° | 40° | 59° | — | — |
| 2023 | 50° | 40° | 45° | 0.1" | — |
| 2022 | 69° | 25° | 47° | — | — |
| 2021 | 65° | 45° | 55° | 0.69" | — |
| 2020 | 59° | 39° | 49° | 0.08" | — |
| 2019 | 63° | 47° | 55° | 0.61" | — |
| 2018 | 45° | 31° | 38° | — | — |
| 2017 | 74° | 39° | 56° | — | — |
| 2016 | 54° | 35° | 44° | 0.03" | — |
| 2015 | 74° | 50° | 62° | 0.03" | — |
| 2014 | 49° | 44° | 46° | — | — |
| 2013 | 54° | 36° | 45° | 0.05" | — |
| 2012 | 62° | 28° | 45° | — | — |
| 2011 | 50° | 40° | 45° | 0.3" | — |
| 2010 | 68° | 38° | 53° | 0.46" | — |
| 2009 | 65° | 40° | 52° | 0.69" | — |
| 2008 | 67° | 35° | 51° | 0.38" | — |
| 2007 | 78° | 48° | 63° | — | — |
| 2006 | 58° | 41° | 49° | 0.05" | — |
| 2005 | 57° | 34° | 45° | — | — |
| 2004 | 54° | 48° | 51° | — | — |
| 2003 | 68° | 45° | 56° | — | — |
| 2002 | 51° | 23° | 37° | — | — |
| 2001 | 65° | 41° | 53° | — | — |
| 2000 | 70° | 41° | 55° | — | — |
| 1999 | 60° | 22° | 41° | — | — |
| 1998 | 50° | 37° | 44° | 0.13" | — |
| 1997 | 51° | 32° | 42° | 0.13" | — |
| 1996 | 57° | 47° | 52° | — | — |
| 1995 | 47° | 39° | 43° | 0.03" | — |
| 1994 | 63° | 45° | 54° | — | — |
| 1993 | 58° | 43° | 50° | 0.43" | — |
| 1992 | 50° | 35° | 43° | — | — |
| 1991 | 60° | 35° | 48° | — | — |
| 1990 | 64° | 39° | 52° | — | — |
| 1989coldest | 43° | 32° | 37° | 0.33" | 0.3" |
| 1988 | 45° | 42° | 43° | 0.28" | — |
| 1987 | 42° | 33° | 38° | 0.25" | 0.4" |
| 1986 | 71° | 49° | 60° | — | — |
| 1985 | 59° | 44° | 52° | — | — |
| 1984 | 61° | 45° | 53° | 2.59" | — |
| 1983 | 58° | 41° | 49° | — | — |
| 1982 | 45° | 36° | 40° | 0.03" | — |
| 1981 | 64° | 39° | 52° | 0.89" | — |
| 1980 | 55° | 40° | 47° | 0.05" | — |
| 1979warmest | 78° | 63° | 70° | — | — |
| 1978 | 74° | 46° | 60° | — | — |
| 1977 | 65° | 38° | 51° | — | — |
| 1976 | 46° | 34° | 40° | 0.15" | — |
| 1975 | 69° | 46° | 58° | — | — |
| 1974 | 51° | 27° | 39° | — | — |
| 1973 | 65° | 41° | 53° | — | — |
| 1972 | 49° | 40° | 44° | 0.25" | — |
| 1971 | 74° | 57° | 65° | — | — |
55 years of data from ANN ARBOR 1W