Weather on October 15
Joliet, IL
55 Years of Data
Avg High
65°F
Avg Low
43°F
Warmest
1975
71°F avg
Coldest
1997
41°F avg
About This Date
October 15th in Joliet, IL typically brings mild fall weather, with average highs around 65°F and lows near 43°F. Over 55 years of records, the warmest October 15th was in 1975 (71°F average), while the coldest was 1997 (41°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 33% of October 15th dates historically, with the wettest October 15th recording 5.84" 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 15th in Joliet, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 63° | 59° | 61° | — | — |
| 2024 | 57° | 40° | 48° | — | — |
| 2023 | 58° | 43° | 50° | 0.03" | — |
| 2022 | 60° | 33° | 47° | — | — |
| 2021 | 73° | 53° | 63° | 0.03" | — |
| 2020 | 77° | 43° | 60° | — | — |
| 2019 | 55° | 38° | 46° | — | — |
| 2018 | 55° | 36° | 45° | 0.41" | — |
| 2017 | 66° | 60° | 63° | 5.84" | — |
| 2016 | 70° | 50° | 60° | — | — |
| 2015 | 65° | 41° | 53° | — | — |
| 2014 | 64° | 50° | 57° | 1.12" | — |
| 2013 | 64° | 42° | 53° | — | — |
| 2012 | 69° | 43° | 56° | 0.08" | — |
| 2011 | 62° | 46° | 54° | — | — |
| 2010 | 70° | 41° | 55° | — | — |
| 2009 | 47° | 39° | 43° | 0.58" | — |
| 2008 | 66° | 55° | 61° | — | — |
| 2007 | 67° | 55° | 61° | — | — |
| 2006 | 51° | 34° | 42° | — | — |
| 2005 | 77° | 48° | 63° | — | — |
| 2004 | 58° | 47° | 52° | 0.64" | — |
| 2003 | 58° | 39° | 48° | 1.45" | — |
| 2002 | 61° | 34° | 47° | — | — |
| 2001 | 61° | 44° | 52° | 0.18" | — |
| 2000 | 80° | 57° | 69° | 0.03" | — |
| 1999 | 66° | 38° | 52° | — | — |
| 1998 | 59° | 39° | 49° | 0.3" | — |
| 1997coldest | 49° | 34° | 41° | — | — |
| 1996 | 68° | 55° | 62° | — | — |
| 1995 | 83° | 37° | 60° | — | — |
| 1994 | 71° | 52° | 61° | — | — |
| 1993 | 65° | 34° | 49° | 0.03" | — |
| 1992 | 72° | 42° | 57° | 0.89" | — |
| 1991 | 51° | 33° | 42° | — | — |
| 1990 | 66° | 35° | 51° | 0.56" | — |
| 1989 | 85° | 56° | 70° | — | — |
| 1988 | 74° | 28° | 51° | — | — |
| 1987 | 68° | 39° | 54° | — | — |
| 1986 | 50° | 33° | 42° | — | — |
| 1985 | 64° | 50° | 57° | 0.03" | — |
| 1984 | 71° | 60° | 66° | 0.15" | — |
| 1983 | 59° | 32° | 46° | — | — |
| 1982 | 63° | 42° | 52° | — | — |
| 1981 | 59° | 54° | 56° | 0.69" | — |
| 1980 | 68° | 44° | 56° | — | — |
| 1979 | 60° | 32° | 46° | — | — |
| 1978 | 52° | 36° | 44° | — | — |
| 1977 | 67° | 37° | 52° | — | — |
| 1976 | 70° | 42° | 56° | — | — |
| 1975warmest | 83° | 59° | 71° | — | — |
| 1974 | 64° | 37° | 51° | — | — |
| 1973 | 76° | 53° | 64° | — | — |
| 1972 | 62° | 37° | 50° | — | — |
| 1971 | 84° | 48° | 66° | — | — |
55 years of data from JOLIET