Weather on October 15
Chicago, IL
55 Years of Data
Avg High
63°F
Avg Low
48°F
Warmest
1989
74°F avg
Coldest
1978
44°F avg
About This Date
October 15th in Chicago, IL typically brings mild fall weather, with average highs around 63°F and lows near 48°F. Over 55 years of records, the warmest October 15th was in 1989 (74°F average), while the coldest was 1978 (44°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 16% of October 15th dates historically, with the wettest October 15th recording 1.65" of rain. The last decade has been 2.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.2°F cooler on this date compared to 20-30 years ago.
Planning for October 15th in Chicago, IL? Great weather for outdoor activities.
Cooling Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 62° | 55° | 59° | — | — |
| 2024 | 50° | 42° | 46° | — | — |
| 2023 | 57° | 46° | 52° | — | — |
| 2022 | 53° | 38° | 45° | — | — |
| 2021 | 64° | 54° | 59° | — | — |
| 2020 | — | 45° | — | — | — |
| 2019 | 65° | 46° | 55° | — | — |
| 2018 | 49° | 39° | 44° | — | — |
| 2017 | 67° | 49° | 58° | — | — |
| 2016 | 71° | 55° | 63° | — | — |
| 2015 | 69° | 51° | 60° | — | — |
| 2014 | 56° | 52° | 54° | — | — |
| 2013 | 65° | 53° | 59° | — | — |
| 2012 | 56° | 48° | 52° | — | — |
| 2011 | 63° | 50° | 56° | — | — |
| 2010 | 62° | 52° | 57° | — | — |
| 2009 | 47° | 42° | 44° | — | — |
| 2008 | 65° | 53° | 59° | — | — |
| 2007 | 71° | 56° | 63° | — | — |
| 2006 | 54° | 37° | 45° | — | — |
| 2005 | 68° | 55° | 62° | — | — |
| 2004 | 53° | 45° | 49° | 0.23" | — |
| 2003 | 62° | 42° | 52° | — | — |
| 2002 | 60° | 40° | 50° | — | — |
| 2001 | 53° | 44° | 49° | 0.15" | — |
| 2000 | 69° | 53° | 61° | 0.08" | — |
| 1999 | 80° | 50° | 65° | — | — |
| 1998 | 66° | 50° | 58° | — | — |
| 1997 | 54° | 35° | 44° | — | — |
| 1996 | 79° | 54° | 66° | — | — |
| 1995 | 57° | 39° | 48° | — | — |
| 1994 | 64° | 53° | 59° | — | — |
| 1993 | 68° | 55° | 62° | — | — |
| 1992 | 62° | 50° | 56° | 1.02" | — |
| 1991 | 54° | 37° | 45° | — | — |
| 1990 | 67° | 43° | 55° | 0.69" | — |
| 1989warmest | 85° | 64° | 74° | — | — |
| 1988 | 74° | 56° | 65° | — | — |
| 1987 | 72° | 51° | 61° | — | — |
| 1986 | 53° | 37° | 45° | — | — |
| 1985 | 65° | 50° | 57° | 0.03" | — |
| 1984 | 71° | 61° | 66° | 1.65" | — |
| 1983 | 70° | 43° | 56° | — | — |
| 1982 | 63° | 50° | 56° | — | — |
| 1981 | 62° | 54° | 58° | 0.03" | — |
| 1980 | 65° | 49° | 57° | — | — |
| 1979 | 64° | 44° | 54° | — | — |
| 1978coldest | 51° | 37° | 44° | 0.08" | — |
| 1977 | 67° | 50° | 58° | — | — |
| 1976 | 70° | 52° | 61° | — | — |
| 1975 | 63° | 49° | 56° | — | — |
| 1974 | 50° | 44° | 47° | — | — |
| 1973 | 67° | 55° | 61° | — | — |
| 1972 | 51° | 41° | 46° | — | — |
| 1971 | 74° | 55° | 64° | — | — |
55 years of data from CHICAGO GRANT PARK