Weather on October 15
Naperville, IL
55 Years of Data
Avg High
65°F
Avg Low
42°F
Warmest
1989
70°F avg
Coldest
2009
38°F avg
About This Date
October 15th in Naperville, IL typically brings mild fall weather, with average highs around 65°F and lows near 42°F. Over 55 years of records, the warmest October 15th was in 1989 (70°F average), while the coldest was 2009 (38°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 42% of October 15th dates historically, with the wettest October 15th recording 8.23" of rain. The last decade has been 3.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.2°F cooler on this date compared to 20-30 years ago.
Planning for October 15th in Naperville, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 53° | 62° | 0.28" | — |
| 2024 | 57° | 37° | 47° | 0.3" | — |
| 2023 | 57° | 42° | 50° | 0.69" | — |
| 2022 | 57° | 29° | 43° | 0.13" | — |
| 2021 | 70° | 46° | 58° | 0.05" | — |
| 2020 | 78° | 44° | 61° | — | — |
| 2019 | 55° | 35° | 45° | — | — |
| 2018 | 54° | 33° | 43° | 0.56" | — |
| 2017 | 66° | 59° | 63° | 8.23" | — |
| 2016 | 67° | 35° | 51° | — | — |
| 2015 | 65° | 37° | 51° | — | — |
| 2014 | 64° | 50° | 57° | 3.12" | — |
| 2013 | 63° | 40° | 51° | — | — |
| 2012 | 69° | 42° | 56° | 1.27" | — |
| 2011 | 61° | 45° | 53° | 0.03" | — |
| 2010 | 68° | 37° | 53° | — | — |
| 2009coldest | 41° | 36° | 38° | 0.46" | — |
| 2008 | 66° | 50° | 58° | — | — |
| 2007 | 63° | 50° | 56° | 0.15" | — |
| 2006 | 53° | 27° | 40° | — | — |
| 2005 | 78° | 47° | 62° | — | — |
| 2004 | 55° | 45° | 50° | 0.36" | — |
| 2003 | 64° | 38° | 51° | 2.72" | — |
| 2002 | 61° | 31° | 46° | — | — |
| 2001 | 60° | 42° | 51° | 0.05" | — |
| 2000 | 78° | 56° | 67° | — | — |
| 1999 | 78° | 48° | 63° | — | — |
| 1998 | 70° | 46° | 58° | 0.13" | — |
| 1997 | 57° | 29° | 43° | — | — |
| 1996 | 80° | 49° | 64° | — | — |
| 1995 | 57° | 34° | 45° | — | — |
| 1994 | 69° | 47° | 58° | — | — |
| 1993 | 71° | 50° | 61° | — | — |
| 1992 | 57° | 47° | 52° | 1.09" | — |
| 1991 | 50° | 33° | 42° | — | — |
| 1990 | 59° | 38° | 48° | 0.97" | — |
| 1989warmest | 84° | 55° | 70° | — | — |
| 1988 | 79° | 56° | 67° | — | — |
| 1987 | 76° | 47° | 61° | — | — |
| 1986 | 57° | 30° | 44° | — | — |
| 1985 | 67° | 46° | 56° | 0.15" | — |
| 1984 | — | 55° | — | 0.41" | — |
| 1983 | 72° | 37° | 54° | — | — |
| 1982 | 65° | 43° | 54° | — | — |
| 1981 | 63° | 53° | 58° | 0.43" | — |
| 1980 | 61° | 45° | 53° | — | — |
| 1979 | 65° | 33° | 49° | — | — |
| 1978 | 55° | 31° | 43° | 0.05" | — |
| 1977 | 68° | 43° | 55° | — | — |
| 1976 | 70° | 31° | 50° | — | — |
| 1975 | 80° | 55° | 68° | 1.68" | — |
| 1974 | 59° | 35° | 47° | — | — |
| 1973 | 74° | 50° | 62° | — | — |
| 1972 | 57° | 29° | 43° | — | — |
| 1971 | 80° | 43° | 61° | — | — |
55 years of data from LISLE - MORTON ARBORETUM