Weather on August 20
Chicago, IL
55 Years of Data
Avg High
81°F
Avg Low
67°F
Warmest
1983
87°F avg
Coldest
1992
66°F avg
About This Date
August 20th 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 20th was in 1983 (87°F average), while the coldest was 1992 (66°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 15% of August 20th dates historically, with the wettest August 20th recording 2.16" of rain. The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Chicago, IL? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 74° | 69° | 71° | — | — |
| 2024 | 71° | 63° | 67° | — | — |
| 2023 | 91° | 72° | 81° | — | — |
| 2022 | 77° | 65° | 71° | — | — |
| 2021 | 82° | 73° | 78° | — | — |
| 2020 | 83° | 66° | 74° | — | — |
| 2019 | 78° | 71° | 75° | — | — |
| 2018 | 76° | 70° | 73° | — | — |
| 2017 | 84° | 68° | 76° | — | — |
| 2016 | 81° | 66° | 73° | — | — |
| 2015 | 74° | 61° | 67° | — | — |
| 2014 | 85° | 70° | 77° | — | — |
| 2013 | 88° | 71° | 79° | — | — |
| 2012 | 76° | 62° | 69° | — | — |
| 2011 | 80° | 69° | 75° | — | — |
| 2010 | 93° | 74° | 83° | — | — |
| 2009 | 79° | 67° | 73° | — | — |
| 2008 | 80° | 70° | 75° | — | — |
| 2007 | 81° | 70° | 75° | — | — |
| 2006 | 76° | 67° | 71° | — | — |
| 2005 | 87° | 71° | 79° | — | — |
| 2004 | 74° | 59° | 66° | — | — |
| 2003 | 90° | 67° | 78° | — | — |
| 2002 | 76° | 59° | 67° | — | — |
| 2001 | 79° | 59° | 69° | — | — |
| 2000 | 75° | 63° | 69° | — | — |
| 1999 | 77° | 61° | 69° | — | — |
| 1998 | 87° | 62° | 75° | — | — |
| 1997 | 73° | 62° | 68° | — | — |
| 1994 | 90° | 69° | 79° | 1.24" | — |
| 1993 | 88° | 71° | 79° | 0.05" | — |
| 1992coldest | 75° | 57° | 66° | — | — |
| 1991 | 75° | 65° | 70° | 0.25" | — |
| 1990 | 83° | 68° | 75° | 2.16" | — |
| 1989 | 83° | 67° | 75° | 1.3" | — |
| 1988 | 79° | 67° | 73° | — | — |
| 1987 | 82° | 64° | 73° | — | — |
| 1986 | 82° | 63° | 72° | — | — |
| 1985 | 74° | 61° | 67° | — | — |
| 1984 | 78° | 64° | 71° | — | — |
| 1983warmest | 99° | 76° | 87° | — | — |
| 1982 | 86° | 74° | 80° | 0.08" | — |
| 1981 | 77° | 61° | 69° | — | — |
| 1980 | 90° | 72° | 81° | — | — |
| 1979 | 78° | 68° | 73° | 1.6" | — |
| 1978 | 77° | 60° | 69° | — | — |
| 1977 | 74° | 60° | 67° | 0.05" | — |
| 1976 | 79° | 70° | 74° | — | — |
| 1975 | 75° | 69° | 72° | — | — |
| 1974 | 86° | 72° | 79° | — | — |
| 1973 | 80° | 70° | 75° | — | — |
| 1972 | 78° | 70° | 74° | — | — |
| 1971 | 95° | 70° | 82° | — | — |
53 years of data from CHICAGO GRANT PARK