Weather on April 18
Naperville, IL
55 Years of Data
Avg High
65°F
Avg Low
39°F
Warmest
2002
75°F avg
Coldest
1983
33°F avg
About This Date
April 18th in Naperville, IL typically brings mild spring weather, with average highs around 65°F and lows near 39°F — a 26°F daily swing. Over 55 years of records, the warmest April 18th was in 2002 (75°F average), while the coldest was 1983 (33°F) — a 42°F range across recorded history. Precipitation has occurred on 31% of recorded April 18th dates, with snow falling 2% of the time. The last decade has been 6.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 6.8°F cooler on this date compared to 20-30 years ago.
Planning for April 18th in Naperville, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
1.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 62° | 45° | 53° | 0.23" | — |
| 2024 | 66° | 42° | 54° | 0.48" | — |
| 2023 | 37° | 29° | 33° | — | — |
| 2022 | 43° | 32° | 37° | 0.66" | 0.4" |
| 2021 | 57° | 31° | 44° | — | — |
| 2020 | 40° | 32° | 36° | 0.15" | — |
| 2019 | 77° | 49° | 63° | 0.28" | — |
| 2018 | 44° | 24° | 34° | — | — |
| 2017 | 73° | 37° | 55° | — | — |
| 2016 | 81° | 40° | 60° | — | — |
| 2015 | 79° | 47° | 63° | — | — |
| 2014 | 62° | 37° | 50° | — | — |
| 2013 | 54° | 42° | 48° | 14.02" | — |
| 2012 | 59° | 35° | 47° | — | — |
| 2011 | 52° | 33° | 42° | 1.32" | — |
| 2010 | 60° | 28° | 44° | — | — |
| 2009 | 71° | 36° | 53° | — | — |
| 2008 | 75° | 47° | 61° | — | — |
| 2007 | 74° | 39° | 56° | — | — |
| 2006 | 67° | 36° | 51° | 0.03" | — |
| 2005 | 83° | 45° | 64° | — | — |
| 2004 | 86° | 53° | 70° | — | — |
| 2003 | 49° | 39° | 44° | 0.05" | — |
| 2002warmest | 90° | 61° | 75° | — | — |
| 2001 | 58° | 25° | 41° | — | — |
| 2000 | 55° | 40° | 47° | — | — |
| 1999 | 48° | 38° | 43° | 0.2" | — |
| 1998 | 64° | 31° | 47° | — | — |
| 1997 | 57° | 24° | 41° | — | — |
| 1996 | 78° | 52° | 65° | — | — |
| 1995 | 77° | 45° | 61° | 1.6" | — |
| 1994 | 85° | 49° | 67° | — | — |
| 1993 | 65° | 42° | 53° | — | — |
| 1992 | 66° | 41° | 54° | 0.28" | — |
| 1991 | 62° | 37° | 50° | — | — |
| 1990 | 55° | 24° | 40° | — | — |
| 1989 | 44° | 33° | 39° | 0.05" | — |
| 1988 | 62° | 34° | 48° | — | — |
| 1987 | 79° | 43° | 61° | — | — |
| 1986 | 70° | 34° | 52° | — | — |
| 1985 | 84° | 60° | 72° | — | — |
| 1984 | 50° | 39° | 45° | 0.25" | — |
| 1983coldest | 41° | 24° | 33° | — | — |
| 1982 | 65° | 34° | 49° | — | — |
| 1981 | 58° | 44° | 51° | — | — |
| 1980 | 71° | 30° | 51° | — | — |
| 1979 | 63° | 30° | 46° | — | — |
| 1978 | 64° | 41° | 53° | 2.62" | — |
| 1977 | 86° | 50° | 68° | — | — |
| 1976 | 83° | 60° | 71° | — | — |
| 1975 | 74° | 49° | 61° | 4.57" | — |
| 1974 | 67° | 40° | 53° | 0.08" | — |
| 1973 | 68° | 41° | 55° | — | — |
| 1972 | 79° | — | — | — | — |
| 1971 | 66° | 38° | 52° | — | — |
55 years of data from LISLE - MORTON ARBORETUM