Weather on August 17
Joliet, IL
55 Years of Data
Avg High
83°F
Avg Low
62°F
Warmest
1988
88°F avg
Coldest
1980
62°F avg
About This Date
August 17th in Joliet, IL typically brings warm summer weather, with average highs around 83°F and lows near 62°F. Over 53 years of records, the warmest August 17th was in 1988 (88°F average), while the coldest was 1980 (62°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 28% of August 17th dates historically, with the wettest August 17th recording 4.5" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for August 17th in Joliet, IL? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 71° | 78° | — | — |
| 2024 | 80° | 64° | 72° | 1.27" | — |
| 2023 | 79° | 56° | 67° | — | — |
| 2022 | 80° | 60° | 70° | — | — |
| 2021 | 82° | 62° | 72° | — | — |
| 2020 | 83° | 61° | 72° | — | — |
| 2019 | 83° | 63° | 73° | 2.41" | — |
| 2018 | 85° | 67° | 76° | 1.3" | — |
| 2017 | 85° | 67° | 76° | 1.52" | — |
| 2016 | 84° | 69° | 77° | — | — |
| 2015 | 87° | 68° | 78° | — | — |
| 2014 | 77° | 62° | 70° | — | — |
| 2013 | 83° | 54° | 68° | — | — |
| 2012 | 73° | 56° | 64° | 0.99" | — |
| 2011 | 81° | 60° | 70° | — | — |
| 2010 | 81° | 62° | 71° | — | — |
| 2009 | 85° | 54° | 69° | 3.86" | — |
| 2008 | 81° | 57° | 69° | — | — |
| 2007 | 80° | 65° | 72° | — | — |
| 2006 | 82° | 61° | 71° | — | — |
| 2005 | 84° | 65° | 74° | — | — |
| 2004 | 77° | 53° | 65° | 0.03" | — |
| 2003 | 90° | 71° | 80° | 0.1" | — |
| 2002 | 77° | 70° | 73° | — | — |
| 2001 | 72° | 58° | 65° | 0.28" | — |
| 2000 | 84° | 64° | 74° | — | — |
| 1999 | 85° | 59° | 72° | — | — |
| 1998 | 85° | 64° | 74° | — | — |
| 1997 | 90° | 67° | 78° | 4.5" | — |
| 1996 | 79° | 62° | 70° | — | — |
| 1995 | 90° | 73° | 81° | 4.19" | — |
| 1994 | 78° | 57° | 68° | — | — |
| 1993 | 82° | 69° | 76° | — | — |
| 1992 | 74° | 53° | 63° | — | — |
| 1991 | 85° | 62° | 73° | 0.61" | — |
| 1990 | 81° | 64° | 72° | — | — |
| 1989 | 76° | 59° | 67° | — | — |
| 1988warmest | 100° | 75° | 88° | — | — |
| 1986 | 91° | 62° | 77° | — | — |
| 1985 | 81° | 56° | 68° | — | — |
| 1984 | 94° | 64° | 79° | — | — |
| 1983 | 93° | 65° | 79° | 1.35" | — |
| 1982 | 83° | 67° | 75° | — | — |
| 1981 | 72° | 53° | 62° | — | — |
| 1980coldest | 67° | 57° | 62° | 1.3" | — |
| 1979 | 74° | 53° | 63° | 0.1" | — |
| 1978 | 83° | 61° | 72° | — | — |
| 1977 | 83° | 55° | 69° | — | — |
| 1976 | 75° | 51° | 63° | — | — |
| 1974 | 87° | 64° | 76° | — | — |
| 1973 | 86° | 64° | 75° | — | — |
| 1972 | 94° | 74° | 84° | — | — |
| 1971 | 87° | 54° | 70° | — | — |
53 years of data from JOLIET