Weather on August 31
Joliet, IL
55 Years of Data
Avg High
81°F
Avg Low
61°F
Warmest
1995
81°F avg
Coldest
2009
57°F avg
About This Date
August 31st in Joliet, IL typically brings warm summer weather, with average highs around 81°F and lows near 61°F. Over 53 years of records, the warmest August 31st was in 1995 (81°F average), while the coldest was 2009 (57°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 23% of August 31st dates historically, with the wettest August 31st recording 5.84" of rain. The last decade has been 1.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.7°F cooler on this date compared to 20-30 years ago.
Planning for August 31st in Joliet, IL? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 56° | 65° | — | — |
| 2024 | 85° | 62° | 73° | — | — |
| 2023 | 72° | 52° | 62° | — | — |
| 2022 | 78° | 57° | 68° | — | — |
| 2021 | 84° | 65° | 74° | — | — |
| 2020 | 79° | 60° | 69° | — | — |
| 2019 | 80° | — | — | — | — |
| 2018 | 74° | 60° | 67° | — | — |
| 2017 | 79° | 59° | 69° | — | — |
| 2016 | 82° | 68° | 75° | 0.76" | — |
| 2015 | 79° | 63° | 71° | — | — |
| 2014 | 83° | 66° | 74° | — | — |
| 2013 | 95° | 65° | 80° | 1.09" | — |
| 2012 | 89° | 63° | 76° | — | — |
| 2011 | 84° | 60° | 72° | 0.33" | — |
| 2010 | 85° | 68° | 76° | 0.05" | — |
| 2009coldest | 67° | 47° | 57° | — | — |
| 2008 | 86° | 57° | 72° | — | — |
| 2007 | 75° | 55° | 65° | — | — |
| 2006 | 75° | 63° | 69° | 0.03" | — |
| 2005 | 82° | 63° | 72° | — | — |
| 2004 | 83° | 54° | 68° | — | — |
| 2003 | 74° | 64° | 69° | — | — |
| 2002 | 84° | 65° | 74° | — | — |
| 2001 | 84° | 68° | 76° | 1.91" | — |
| 2000 | 90° | 65° | 77° | — | — |
| 1999 | 73° | 55° | 64° | — | — |
| 1998 | 81° | 59° | 70° | — | — |
| 1997 | 74° | 60° | 67° | — | — |
| 1996 | 83° | 59° | 71° | — | — |
| 1995warmest | 90° | 73° | 81° | — | — |
| 1994 | 65° | 58° | 61° | 1.98" | — |
| 1993 | 72° | 68° | 70° | 1.52" | — |
| 1992 | 74° | 52° | 63° | — | — |
| 1991 | 83° | 61° | 72° | — | — |
| 1990 | 81° | 59° | 70° | — | — |
| 1989 | 83° | 57° | 70° | 4.45" | — |
| 1988 | 77° | 53° | 65° | — | — |
| 1986 | 78° | 56° | 67° | — | — |
| 1985 | 76° | 56° | 66° | — | — |
| 1984 | 85° | 52° | 68° | — | — |
| 1983 | 82° | 66° | 74° | — | — |
| 1982 | 82° | 62° | 72° | 0.15" | — |
| 1981 | 84° | 64° | 74° | 0.08" | — |
| 1980 | 87° | 64° | 76° | 5.84" | — |
| 1979 | 87° | 63° | 75° | — | — |
| 1978 | 82° | 53° | 68° | — | — |
| 1977 | 83° | 61° | 72° | — | — |
| 1976 | 78° | 54° | 66° | — | — |
| 1974 | 84° | 63° | 73° | — | — |
| 1973 | 91° | 69° | 80° | — | — |
| 1972 | 90° | 68° | 79° | — | — |
| 1971 | 86° | 62° | 74° | — | — |
53 years of data from JOLIET