Weather on October 9
Naperville, IL
55 Years of Data
Avg High
69°F
Avg Low
43°F
Warmest
1997
76°F avg
Coldest
2009
39°F avg
About This Date
October 9th in Naperville, IL typically brings mild fall weather, with average highs around 69°F and lows near 43°F — a 26°F daily swing. Over 55 years of records, the warmest October 9th was in 1997 (76°F average), while the coldest was 2009 (39°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 22% of October 9th dates historically, with the wettest October 9th recording 2.97" of rain. The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
Planning for October 9th in Naperville, IL? Great weather for outdoor activities.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 38° | 52° | — | — |
| 2024 | 73° | 40° | 56° | — | — |
| 2023 | 53° | 36° | 44° | — | — |
| 2022 | 57° | 29° | 43° | — | — |
| 2021 | 75° | 59° | 67° | 0.13" | — |
| 2020 | 72° | 40° | 56° | — | — |
| 2019 | 71° | 41° | 56° | — | — |
| 2018 | 85° | 63° | 74° | 0.23" | — |
| 2017 | 79° | 47° | 63° | — | — |
| 2016 | 66° | 37° | 52° | — | — |
| 2015 | 78° | 52° | 65° | — | — |
| 2014 | 66° | 43° | 54° | — | — |
| 2013 | 76° | 42° | 59° | — | — |
| 2012 | 60° | 32° | 46° | — | — |
| 2011 | 82° | 45° | 63° | — | — |
| 2010 | 79° | 39° | 59° | — | — |
| 2009coldest | 50° | 28° | 39° | 0.94" | — |
| 2008 | 65° | 42° | 53° | — | — |
| 2007 | 87° | 51° | 69° | — | — |
| 2006 | 74° | 43° | 58° | — | — |
| 2005 | 61° | 49° | 55° | — | — |
| 2004 | 70° | 42° | 56° | 0.74" | — |
| 2003 | 73° | 53° | 63° | — | — |
| 2002 | 71° | 46° | 59° | — | — |
| 2001 | 76° | 54° | 65° | — | — |
| 2000 | 60° | 26° | 43° | — | — |
| 1999 | 70° | 50° | 60° | — | — |
| 1998 | 67° | 38° | 52° | — | — |
| 1997warmest | 86° | 67° | 76° | 0.18" | — |
| 1996 | 59° | 34° | 46° | 0.03" | — |
| 1995 | 75° | 46° | 61° | — | — |
| 1994 | 57° | 43° | 50° | 1.47" | — |
| 1993 | 78° | 38° | 58° | 2.08" | — |
| 1992 | 63° | 43° | 53° | 0.46" | — |
| 1991 | 75° | 50° | 63° | — | — |
| 1990 | 50° | 45° | 47° | 2.97" | — |
| 1989 | 58° | 30° | 44° | — | — |
| 1988 | 66° | 42° | 54° | — | — |
| 1987 | 61° | 37° | 49° | — | — |
| 1986 | 73° | 50° | 62° | — | — |
| 1985 | 65° | 48° | 56° | 0.51" | — |
| 1984 | — | 52° | — | — | — |
| 1983 | 60° | 41° | 51° | — | — |
| 1982 | 78° | 60° | 69° | 1.37" | — |
| 1981 | 66° | 34° | 50° | — | — |
| 1980 | 78° | 44° | 61° | — | — |
| 1979 | 62° | 42° | 52° | — | — |
| 1978 | 73° | 41° | 57° | — | — |
| 1977 | 54° | 42° | 48° | — | — |
| 1976 | 58° | 32° | 45° | — | — |
| 1975 | 70° | 42° | 56° | — | — |
| 1974 | 69° | 35° | 52° | — | — |
| 1973 | 82° | — | — | — | — |
| 1972 | 65° | 36° | 50° | — | — |
| 1971 | 65° | 38° | 51° | — | — |
55 years of data from LISLE - MORTON ARBORETUM