Weather on October 18
Naperville, IL
55 Years of Data
Avg High
64°F
Avg Low
40°F
Warmest
2016
75°F avg
Coldest
2022
36°F avg
About This Date
October 18th in Naperville, IL typically brings mild fall weather, with average highs around 64°F and lows near 40°F. Over 55 years of records, the warmest October 18th was in 2016 (75°F average), while the coldest was 2022 (36°F) — a 39°F range across recorded history. Rain or other precipitation has occurred on about 29% of October 18th dates historically, with the wettest October 18th recording 7.19" of rain. The last decade has been 1.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.1°F cooler on this date compared to 20-30 years ago.
Planning for October 18th in Naperville, IL? Great weather for outdoor activities.
Cooling Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | — | — | — | — |
| 2024 | 64° | 30° | 47° | — | — |
| 2023 | 62° | 32° | 47° | — | — |
| 2022coldest | 39° | 32° | 36° | — | — |
| 2021 | 68° | 36° | 52° | — | — |
| 2020 | 64° | 40° | 52° | — | — |
| 2019 | 56° | 32° | 44° | — | — |
| 2018 | 53° | 27° | 40° | — | — |
| 2017 | 71° | 47° | 59° | — | — |
| 2016warmest | 83° | 68° | 75° | — | — |
| 2015 | 54° | 27° | 40° | — | — |
| 2014 | 61° | 44° | 52° | — | — |
| 2013 | 54° | 35° | 44° | 0.53" | — |
| 2012 | 67° | 46° | 56° | 2.01" | — |
| 2011 | 58° | 35° | 46° | — | — |
| 2010 | 67° | 41° | 54° | — | — |
| 2009 | 52° | 26° | 39° | — | — |
| 2008 | 56° | 37° | 46° | 0.18" | — |
| 2007 | 73° | 43° | 58° | 0.91" | — |
| 2006 | 63° | 56° | 59° | 0.08" | — |
| 2005 | 76° | 40° | 58° | — | — |
| 2004 | 56° | 33° | 44° | — | — |
| 2003 | 72° | 41° | 56° | — | — |
| 2002 | 61° | 35° | 48° | 0.28" | — |
| 2001 | 67° | 37° | 52° | — | — |
| 2000 | 72° | 38° | 55° | — | — |
| 1999 | 56° | 30° | 43° | — | — |
| 1998 | 66° | 47° | 56° | 7.19" | — |
| 1997 | 61° | 30° | 45° | — | — |
| 1996 | 69° | 42° | 56° | 0.79" | — |
| 1995 | 75° | 47° | 61° | — | — |
| 1994 | 78° | 61° | 69° | — | — |
| 1993 | 64° | 36° | 50° | — | — |
| 1992 | 50° | 37° | 44° | — | — |
| 1991 | 74° | 44° | 59° | 0.58" | — |
| 1990 | 76° | 38° | 57° | — | — |
| 1989 | 45° | 33° | 39° | — | — |
| 1988 | 58° | 45° | 51° | 4.47" | — |
| 1987 | 69° | 39° | 54° | — | — |
| 1986 | 63° | 33° | 48° | — | — |
| 1985 | 72° | 58° | 65° | 0.2" | — |
| 1984 | — | 43° | — | 0.08" | — |
| 1983 | 64° | 38° | 51° | — | — |
| 1982 | 71° | 44° | 58° | — | — |
| 1981 | 64° | 48° | 56° | 0.94" | — |
| 1980 | 68° | 42° | 55° | — | — |
| 1979 | 74° | 53° | 63° | — | — |
| 1978 | 61° | 41° | 51° | 0.03" | — |
| 1977 | 62° | 41° | 52° | 0.1" | — |
| 1976 | 50° | 27° | 38° | — | — |
| 1975 | 52° | 40° | 46° | — | — |
| 1974 | 65° | 39° | 52° | — | — |
| 1973 | 59° | 43° | 51° | — | — |
| 1972 | 45° | 30° | 37° | 0.08" | — |
| 1971 | 75° | 50° | 63° | — | — |
55 years of data from LISLE - MORTON ARBORETUM