Weather on August 18
Chicago, IL
55 Years of Data
Avg High
81°F
Avg Low
67°F
Warmest
1988
89°F avg
Coldest
1997
65°F avg
About This Date
August 18th in Chicago, IL typically brings warm summer weather, with average highs around 81°F and lows near 67°F. Over 53 years of records, the warmest August 18th was in 1988 (89°F average), while the coldest was 1997 (65°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 15% of August 18th dates historically, with the wettest August 18th recording 3.51" of rain. The last decade has been 3.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.0°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in Chicago, IL? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 70° | 78° | — | — |
| 2024 | 76° | 69° | 72° | — | — |
| 2023 | 79° | 58° | 68° | — | — |
| 2022 | 79° | 65° | 72° | — | — |
| 2021 | 82° | 72° | 77° | — | — |
| 2020 | 75° | 68° | 72° | — | — |
| 2019 | 83° | 67° | 75° | — | — |
| 2018 | 80° | 72° | 76° | — | — |
| 2017 | 83° | 68° | 75° | — | — |
| 2016 | 85° | 70° | 77° | — | — |
| 2015 | 84° | 68° | 76° | — | — |
| 2014 | 80° | 65° | 72° | — | — |
| 2013 | 76° | 67° | 71° | — | — |
| 2012 | 77° | 62° | 70° | — | — |
| 2011 | 81° | 73° | 77° | — | — |
| 2010 | 83° | 66° | 74° | — | — |
| 2009 | 87° | 71° | 79° | — | — |
| 2008 | 88° | 70° | 79° | — | — |
| 2007 | 73° | 65° | 69° | — | — |
| 2006 | 82° | 72° | 77° | — | — |
| 2005 | 84° | 70° | 77° | — | — |
| 2004 | 77° | 65° | 71° | 0.28" | — |
| 2003 | 84° | 68° | 76° | — | — |
| 2002 | 82° | 59° | 71° | — | — |
| 2001 | 71° | 64° | 68° | 1.17" | — |
| 2000 | 76° | 62° | 69° | — | — |
| 1999 | 75° | 65° | 70° | 0.05" | — |
| 1998 | 78° | 69° | 74° | — | — |
| 1997coldest | 69° | 60° | 65° | — | — |
| 1994 | 82° | 64° | 73° | — | — |
| 1993 | 80° | 70° | 75° | — | — |
| 1992 | 78° | 62° | 70° | — | — |
| 1991 | 86° | 67° | 76° | — | — |
| 1990 | 87° | 63° | 75° | 2.72" | — |
| 1989 | 78° | 62° | 70° | — | — |
| 1988warmest | 100° | 78° | 89° | — | — |
| 1987 | 86° | 65° | 75° | 0.86" | — |
| 1986 | 80° | 69° | 75° | — | — |
| 1985 | 86° | 70° | 78° | 0.08" | — |
| 1984 | 86° | 66° | 76° | — | — |
| 1983 | 89° | 74° | 81° | — | — |
| 1982 | 84° | 60° | 72° | — | — |
| 1981 | 75° | 59° | 67° | — | — |
| 1980 | 79° | 66° | 72° | 0.23" | — |
| 1979 | 79° | 63° | 71° | 3.51" | — |
| 1978 | 83° | 70° | 76° | — | — |
| 1977 | 78° | 56° | 67° | — | — |
| 1976 | 78° | 66° | 72° | — | — |
| 1975 | — | 69° | — | — | — |
| 1974 | 74° | 66° | 70° | — | — |
| 1973 | 80° | 73° | 77° | — | — |
| 1972 | 92° | 79° | 85° | — | — |
| 1971 | 84° | 60° | 72° | — | — |
53 years of data from CHICAGO GRANT PARK