Weather on May 18
Chicago, IL
55 Years of Data
Avg High
70°F
Avg Low
52°F
Warmest
1977
79°F avg
Coldest
2002
43°F avg
About This Date
May 18th in Chicago, IL typically brings pleasant spring weather, with average highs around 70°F and lows near 52°F. Over 53 years of records, the warmest May 18th was in 1977 (79°F average), while the coldest was 2002 (43°F) — a 36°F range across recorded history. Rain or other precipitation has occurred on about 19% of May 18th dates historically, with the wettest May 18th recording 3.2" of rain. The last decade has been 4.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.8°F cooler on this date compared to 20-30 years ago.
Planning for May 18th in Chicago, IL? Great weather for outdoor activities.
Cooling Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 59° | 45° | 52° | — | — |
| 2024 | 84° | 58° | 71° | — | — |
| 2023 | 75° | 47° | 61° | — | — |
| 2022 | 58° | 51° | 54° | — | — |
| 2021 | 71° | 55° | 63° | — | — |
| 2020 | 59° | 49° | 54° | — | — |
| 2019 | 66° | 43° | 54° | — | — |
| 2018 | 55° | 50° | 53° | — | — |
| 2017 | 78° | 47° | 62° | — | — |
| 2016 | 55° | 47° | 51° | — | — |
| 2015 | 79° | 51° | 65° | — | — |
| 2014 | 70° | 49° | 59° | — | — |
| 2013 | 66° | 53° | 60° | — | — |
| 2012 | 77° | 58° | 67° | — | — |
| 2011 | 57° | 49° | 53° | — | — |
| 2010 | 57° | 52° | 54° | — | — |
| 2009 | 67° | 50° | 58° | — | — |
| 2008 | 56° | 49° | 52° | — | — |
| 2007 | 66° | 50° | 58° | — | — |
| 2006 | 58° | 51° | 54° | — | — |
| 2005 | 79° | 58° | 68° | — | — |
| 2004 | 74° | 50° | 62° | 0.56" | — |
| 2003 | 71° | 51° | 61° | — | — |
| 2002coldest | 53° | 34° | 43° | — | — |
| 2001 | 74° | 58° | 66° | 0.46" | — |
| 2000 | 71° | 47° | 59° | 1.32" | — |
| 1999 | 70° | 56° | 63° | 0.23" | — |
| 1998 | 92° | 64° | 78° | — | — |
| 1997 | 79° | 44° | 61° | — | — |
| 1994 | 57° | 48° | 53° | — | — |
| 1993 | 68° | 51° | 60° | — | — |
| 1992 | 78° | 45° | 61° | — | — |
| 1991 | 55° | 47° | 51° | 1.78" | — |
| 1990 | 68° | 50° | 59° | — | — |
| 1989 | 75° | 57° | 66° | 0.03" | — |
| 1988 | 60° | 46° | 53° | — | — |
| 1987 | 90° | 65° | 77° | 1.73" | — |
| 1986 | 66° | 45° | 55° | 3.2" | — |
| 1985 | 65° | 48° | 56° | — | — |
| 1984 | 87° | 61° | 74° | — | — |
| 1983 | 62° | 47° | 54° | 0.08" | — |
| 1982 | 81° | 67° | 74° | — | — |
| 1981 | 51° | 44° | 48° | — | — |
| 1980 | 65° | 53° | 59° | 0.46" | — |
| 1979 | 85° | 64° | 74° | — | — |
| 1978 | 77° | 56° | 66° | — | — |
| 1977warmest | 89° | 70° | 79° | — | — |
| 1976 | 61° | 45° | 53° | — | — |
| 1975 | 84° | 49° | 66° | — | — |
| 1974 | 53° | 48° | 51° | — | — |
| 1973 | 65° | 48° | 56° | — | — |
| 1972 | 80° | 56° | 68° | — | — |
| 1971 | 87° | 66° | 77° | — | — |
53 years of data from CHICAGO GRANT PARK