Weather on May 18
Naperville, IL
55 Years of Data
Avg High
74°F
Avg Low
49°F
Warmest
1996
81°F avg
Coldest
2002
44°F avg
About This Date
May 18th in Naperville, IL typically brings pleasant spring weather, with average highs around 74°F and lows near 49°F — a 25°F daily swing. Over 55 years of records, the warmest May 18th was in 1996 (81°F average), while the coldest was 2002 (44°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 40% of May 18th dates historically, with the wettest May 18th recording 7.92" of rain. The last decade has been 6.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 6.2°F cooler on this date compared to 20-30 years ago.
Planning for May 18th in Naperville, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 70° | 49° | 59° | — | — |
| 2024 | 81° | 58° | 69° | — | — |
| 2023 | 63° | 36° | 49° | — | — |
| 2022 | 71° | 51° | 61° | 0.25" | — |
| 2021 | 69° | 52° | 60° | — | — |
| 2020 | 77° | 49° | 63° | 7.92" | — |
| 2019 | 54° | 43° | 48° | 0.23" | — |
| 2018 | 75° | 51° | 63° | — | — |
| 2017 | 84° | 63° | 73° | 1.04" | — |
| 2016 | 59° | 35° | 47° | — | — |
| 2015 | 82° | 66° | 74° | 0.03" | — |
| 2014 | 61° | 38° | 49° | 0.03" | — |
| 2013 | 73° | 51° | 62° | — | — |
| 2012 | 74° | 44° | 59° | — | — |
| 2011 | 62° | 44° | 53° | 0.05" | — |
| 2010 | 68° | 47° | 57° | 0.13" | — |
| 2009 | 62° | 36° | 49° | — | — |
| 2008 | 73° | 45° | 59° | 0.56" | — |
| 2007 | 62° | 35° | 49° | — | — |
| 2006 | 64° | 42° | 53° | 0.46" | — |
| 2005 | 75° | 57° | 66° | — | — |
| 2004 | 81° | 51° | 66° | 0.53" | — |
| 2003 | 72° | 48° | 60° | — | — |
| 2002coldest | 57° | 31° | 44° | — | — |
| 2001 | 88° | 63° | 75° | — | — |
| 2000 | 69° | 52° | 60° | 0.18" | — |
| 1999 | 77° | 57° | 67° | 0.79" | — |
| 1998 | 93° | 54° | 73° | — | — |
| 1997 | 84° | 40° | 62° | — | — |
| 1996warmest | 92° | 70° | 81° | — | — |
| 1995 | 61° | 46° | 53° | 0.03" | — |
| 1994 | 69° | 37° | 53° | — | — |
| 1993 | 72° | 39° | 55° | — | — |
| 1992 | 79° | 46° | 62° | — | — |
| 1991 | 59° | 46° | 53° | 1.91" | — |
| 1990 | 72° | 48° | 60° | — | — |
| 1989 | 81° | 54° | 67° | — | — |
| 1988 | 75° | 39° | 57° | — | — |
| 1987 | 83° | 64° | 73° | 2.41" | — |
| 1986 | 78° | 45° | 61° | 4.95" | — |
| 1985 | 70° | 47° | 58° | — | — |
| 1984 | 89° | 58° | 73° | — | — |
| 1983 | 67° | 44° | 55° | 0.1" | — |
| 1982 | 86° | 59° | 73° | — | — |
| 1981 | 58° | 48° | 53° | — | — |
| 1980 | 63° | 53° | 58° | 1.98" | — |
| 1979 | 85° | 58° | 71° | 0.03" | — |
| 1978 | 81° | 46° | 63° | — | — |
| 1977 | 90° | 63° | 76° | 0.08" | — |
| 1976 | 67° | 33° | 50° | — | — |
| 1975 | 89° | 44° | 67° | — | — |
| 1974 | 62° | 47° | 54° | 0.64" | — |
| 1973 | 71° | 34° | 52° | — | — |
| 1972 | 88° | 50° | 69° | — | — |
| 1971 | 86° | 65° | 75° | — | — |
55 years of data from WHEATON 3 SE