Weather on October 21
Chicago, IL
55 Years of Data
Avg High
62°F
Avg Low
47°F
Warmest
1979
74°F avg
Coldest
1995
40°F avg
About This Date
October 21st in Chicago, IL typically brings mild fall weather, with average highs around 62°F and lows near 47°F. Over 55 years of records, the warmest October 21st was in 1979 (74°F average), while the coldest was 1995 (40°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 18% of October 21st dates historically, with the wettest October 21st recording 1.65" of rain. The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Chicago, IL? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 55° | 47° | 51° | — | — |
| 2024 | 81° | 56° | 68° | — | — |
| 2023 | 63° | 47° | 55° | — | — |
| 2022 | 75° | 46° | 61° | — | — |
| 2021 | 66° | 49° | 57° | — | — |
| 2020 | 54° | 47° | 50° | — | — |
| 2019 | 67° | 51° | 59° | — | — |
| 2018 | 50° | 32° | 41° | — | — |
| 2017 | 77° | 63° | 70° | — | — |
| 2016 | 53° | 46° | 50° | — | — |
| 2015 | 75° | 56° | 65° | — | — |
| 2014 | 53° | 48° | 51° | — | — |
| 2013 | 56° | 39° | 47° | — | — |
| 2012 | 65° | 44° | 54° | — | — |
| 2011 | 56° | 43° | 49° | — | — |
| 2010 | 59° | 47° | 53° | — | — |
| 2009 | 70° | 57° | 63° | — | — |
| 2008 | 55° | 47° | 51° | — | — |
| 2007 | 80° | 57° | 69° | — | — |
| 2006 | 61° | 50° | 55° | — | — |
| 2005 | 57° | 52° | 54° | — | — |
| 2004 | 59° | 49° | 54° | — | — |
| 2003 | 67° | 50° | 58° | — | — |
| 2002 | 57° | 39° | 48° | — | — |
| 2001 | 66° | 55° | 61° | — | — |
| 2000 | 70° | 54° | 62° | — | — |
| 1999 | 70° | 39° | 54° | — | — |
| 1998 | 55° | 41° | 48° | 0.05" | — |
| 1997 | 49° | 38° | 43° | — | — |
| 1996 | 65° | 47° | 56° | — | — |
| 1995coldest | 42° | 37° | 40° | 0.25" | — |
| 1994 | 67° | 47° | 57° | — | — |
| 1993 | 56° | 40° | 48° | 0.66" | — |
| 1992 | 58° | 42° | 50° | — | — |
| 1991 | 65° | 41° | 53° | — | — |
| 1990 | 66° | 54° | 60° | — | — |
| 1989 | 51° | 36° | 43° | 0.18" | — |
| 1988 | 52° | 44° | 48° | 0.38" | — |
| 1987 | 57° | 34° | 45° | 0.18" | — |
| 1986 | 75° | 55° | 65° | — | — |
| 1985 | 57° | 52° | 54° | 0.46" | — |
| 1984 | 52° | 45° | 48° | 1.65" | — |
| 1983 | 56° | 48° | 52° | 1.22" | — |
| 1982 | 46° | 35° | 41° | — | — |
| 1981 | 70° | 46° | 58° | 0.18" | — |
| 1980 | 60° | 48° | 54° | — | — |
| 1979warmest | 79° | 69° | 74° | — | — |
| 1978 | 76° | 53° | 64° | — | — |
| 1977 | 69° | 49° | 59° | — | — |
| 1976 | 49° | 35° | 42° | — | — |
| 1975 | 69° | 54° | 61° | — | — |
| 1974 | 52° | 34° | 43° | — | — |
| 1973 | 61° | 49° | 55° | — | — |
| 1972 | 49° | 42° | 45° | — | — |
| 1971 | 75° | 63° | 69° | — | — |
55 years of data from CHICAGO GRANT PARK