Weather on October 21
Joliet, IL
55 Years of Data
Avg High
62°F
Avg Low
41°F
Warmest
1971
72°F avg
Coldest
1989
37°F avg
About This Date
October 21st in Joliet, IL typically brings mild fall weather, with average highs around 62°F and lows near 41°F. Over 55 years of records, the warmest October 21st was in 1971 (72°F average), while the coldest was 1989 (37°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 29% of October 21st dates historically, with the wettest October 21st recording 1.91" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for October 21st in Joliet, IL? Great weather for outdoor activities.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 62° | 47° | 54° | — | — |
| 2024 | 77° | 44° | 61° | — | — |
| 2023 | 61° | 42° | 51° | — | — |
| 2022 | 63° | 30° | 46° | — | — |
| 2021 | 71° | 50° | 61° | — | — |
| 2020 | 55° | 40° | 47° | 0.41" | — |
| 2019 | 63° | 47° | 55° | — | — |
| 2018 | 51° | 27° | 39° | — | — |
| 2017 | 78° | 50° | 64° | — | — |
| 2016 | 55° | 38° | 46° | — | — |
| 2015 | 76° | 55° | 65° | 0.13" | — |
| 2014 | 65° | 47° | 56° | — | — |
| 2013 | 66° | 41° | 54° | 0.13" | — |
| 2012 | 56° | 38° | 47° | — | — |
| 2011 | 48° | 38° | 43° | 0.03" | — |
| 2010 | 70° | 30° | 50° | — | — |
| 2009 | 64° | 48° | 56° | 0.05" | — |
| 2008 | 64° | 41° | 53° | 0.64" | — |
| 2007 | 75° | 46° | 61° | — | — |
| 2006 | 55° | 34° | 44° | 0.05" | — |
| 2005 | 53° | 48° | 51° | — | — |
| 2004 | 56° | 49° | 52° | — | — |
| 2003 | 85° | 51° | 68° | — | — |
| 2002 | 52° | 31° | 41° | — | — |
| 2001 | 69° | 45° | 57° | — | — |
| 2000 | 77° | 51° | 64° | — | — |
| 1999 | 54° | 35° | 44° | — | — |
| 1998 | 59° | 38° | 48° | — | — |
| 1997 | 53° | 36° | 44° | — | — |
| 1996 | 62° | 33° | 48° | — | — |
| 1995 | 46° | 39° | 43° | 0.38" | — |
| 1994 | 65° | 43° | 54° | — | — |
| 1993 | 58° | 40° | 49° | 0.84" | — |
| 1992 | 60° | 25° | 42° | — | — |
| 1991 | 67° | 38° | 52° | — | — |
| 1990 | 67° | 40° | 53° | — | — |
| 1989coldest | 41° | 34° | 37° | 0.15" | — |
| 1988 | 51° | 39° | 45° | 0.51" | — |
| 1987 | 55° | 31° | 43° | 0.2" | — |
| 1986 | 73° | 42° | 58° | — | — |
| 1985 | 65° | 51° | 58° | — | — |
| 1984 | 54° | 41° | 47° | 1.32" | — |
| 1983 | 51° | 43° | 47° | 1.91" | — |
| 1982 | 45° | 34° | 39° | 0.05" | — |
| 1981 | 70° | 45° | 57° | — | — |
| 1980 | 62° | 42° | 52° | — | — |
| 1979 | 79° | 66° | 72° | — | — |
| 1978 | 73° | 37° | 55° | — | — |
| 1977 | 64° | 37° | 51° | — | — |
| 1976 | 46° | 32° | 39° | — | — |
| 1975 | 72° | 42° | 57° | — | — |
| 1974 | 57° | 29° | 43° | — | — |
| 1973 | 69° | 37° | 53° | — | — |
| 1972 | 49° | 41° | 45° | 1.32" | — |
| 1971warmest | 81° | 63° | 72° | — | — |
55 years of data from JOLIET