Weather on October 21
Ann Arbor, MI
55 Years of Data
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° | — | — |
Ann Arbor, MI Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Ann Arbor, MI Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Ann Arbor, MI Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Ann Arbor, MI
Ann Arbor, MI has no months that meet our "pleasant" threshold — every season has tradeoffs.