Weather on August 31
Chicago, IL
55 Years of Data
Avg High
80°F
Avg Low
65°F
Warmest
2010
86°F avg
Coldest
1994
62°F avg
About This Date
August 31st in Chicago, IL typically brings warm summer weather, with average highs around 80°F and lows near 65°F. Over 53 years of records, the warmest August 31st was in 2010 (86°F average), while the coldest was 1994 (62°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 17% of August 31st dates historically, with the wettest August 31st recording 4.32" of rain. The last decade has been 1.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.5°F cooler on this date compared to 20-30 years ago.
Planning for August 31st in Chicago, IL? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 62° | 67° | — | — |
| 2024 | 78° | 67° | 72° | — | — |
| 2023 | 76° | 54° | 65° | — | — |
| 2022 | 85° | 65° | 75° | — | — |
| 2021 | 79° | 69° | 74° | — | — |
| 2020 | 83° | 66° | 74° | — | — |
| 2019 | 72° | 64° | 68° | — | — |
| 2018 | 80° | 63° | 71° | — | — |
| 2017 | 71° | 65° | 68° | — | — |
| 2016 | 75° | 69° | 72° | — | — |
| 2015 | 77° | 65° | 71° | — | — |
| 2014 | 85° | 71° | 78° | — | — |
| 2013 | 75° | 69° | 72° | — | — |
| 2012 | 94° | 76° | 85° | — | — |
| 2011 | 90° | 67° | 78° | — | — |
| 2010warmest | 93° | 78° | 86° | — | — |
| 2009 | 67° | 57° | 62° | — | — |
| 2008 | 84° | 71° | 78° | — | — |
| 2007 | 76° | 66° | 71° | — | — |
| 2006 | 74° | 64° | 69° | — | — |
| 2005 | 76° | 67° | 71° | — | — |
| 2004 | 80° | 60° | 70° | — | — |
| 2003 | 70° | 62° | 66° | 0.97" | — |
| 2002 | 84° | 67° | 75° | — | — |
| 2001 | 81° | 63° | 72° | 0.3" | — |
| 2000 | 94° | 73° | 83° | — | — |
| 1999 | 79° | 57° | 68° | — | — |
| 1998 | 81° | 61° | 71° | — | — |
| 1997 | 80° | 67° | 73° | — | — |
| 1994coldest | 65° | 60° | 62° | 1.73" | — |
| 1993 | 89° | 63° | 76° | 2.41" | — |
| 1992 | 75° | 56° | 65° | — | — |
| 1991 | 85° | 73° | 79° | — | — |
| 1990 | 88° | 64° | 76° | — | — |
| 1989 | 81° | 62° | 71° | — | — |
| 1988 | 82° | 50° | 66° | — | — |
| 1987 | 83° | 59° | 71° | 0.08" | — |
| 1986 | 79° | 57° | 68° | — | — |
| 1985 | 76° | 60° | 68° | — | — |
| 1984 | 83° | 59° | 71° | — | — |
| 1983 | 85° | 70° | 77° | 4.32" | — |
| 1982 | 78° | 65° | 71° | 0.2" | — |
| 1981 | 85° | 69° | 77° | 0.64" | — |
| 1980 | 84° | 66° | 75° | 4.06" | — |
| 1979 | 86° | 66° | 76° | — | — |
| 1978 | 79° | 62° | 70° | — | — |
| 1977 | 87° | 69° | 78° | — | — |
| 1976 | 90° | 67° | 78° | — | — |
| 1975 | 69° | 64° | 67° | — | — |
| 1974 | 72° | 62° | 67° | — | — |
| 1973 | 89° | 78° | 84° | — | — |
| 1972 | 82° | 71° | 77° | — | — |
| 1971 | 76° | 65° | 70° | — | — |
53 years of data from CHICAGO GRANT PARK