Weather on July 20
Joliet, IL
55 Years of Data
Avg High
86°F
Avg Low
66°F
Warmest
2011
88°F avg
Coldest
2009
61°F avg
About This Date
July 20th in Joliet, IL typically brings warm summer weather, with average highs around 86°F and lows near 66°F. Over 54 years of records, the warmest July 20th was in 2011 (88°F average), while the coldest was 2009 (61°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 33% of July 20th dates historically, with the wettest July 20th recording 5.08" 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 July 20th in Joliet, IL? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Cooling Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 71° | 76° | — | — |
| 2024 | 79° | 56° | 67° | — | — |
| 2023 | 83° | 60° | 71° | — | — |
| 2022 | 86° | 68° | 77° | — | — |
| 2021 | 84° | 64° | 74° | — | — |
| 2020 | 82° | 66° | 74° | 5.08" | — |
| 2019 | 92° | 72° | 82° | — | — |
| 2018 | 84° | 63° | 73° | — | — |
| 2017 | 89° | 68° | 79° | 1.24" | — |
| 2016 | 85° | 68° | 76° | — | — |
| 2015 | 84° | 64° | 74° | — | — |
| 2014 | 80° | 59° | 70° | — | — |
| 2013 | 95° | 73° | 84° | 0.03" | — |
| 2012 | 85° | 69° | 77° | 0.18" | — |
| 2011warmest | 98° | 78° | 88° | — | — |
| 2010 | 84° | 66° | 75° | — | — |
| 2009coldest | 73° | 48° | 61° | — | — |
| 2008 | 81° | 67° | 74° | 2.21" | — |
| 2007 | 82° | 64° | 73° | — | — |
| 2006 | 87° | 70° | 78° | 0.64" | — |
| 2005 | 91° | 57° | 74° | — | — |
| 2004 | 82° | 62° | 72° | — | — |
| 2003 | 81° | 59° | 70° | — | — |
| 2002 | 86° | 66° | 76° | — | — |
| 2001 | 87° | 71° | 79° | — | — |
| 2000 | 75° | 57° | 66° | — | — |
| 1999 | 88° | 72° | 80° | 0.18" | — |
| 1998 | 91° | 68° | 80° | 0.76" | — |
| 1997 | 89° | 68° | 79° | — | — |
| 1996 | 83° | 62° | 72° | 0.03" | — |
| 1995 | 89° | 64° | 77° | — | — |
| 1994 | 83° | 66° | 74° | 0.81" | — |
| 1993 | 86° | 64° | 75° | — | — |
| 1992 | 83° | 61° | 72° | — | — |
| 1991 | 94° | 71° | 82° | — | — |
| 1990 | 87° | 68° | 78° | 2.41" | — |
| 1989 | 75° | 65° | 70° | 1.52" | — |
| 1988 | 86° | 66° | 76° | — | — |
| 1987 | 92° | 72° | 82° | — | — |
| 1986 | 96° | 69° | 83° | 0.03" | — |
| 1985 | 85° | 66° | 75° | — | — |
| 1984 | 85° | 55° | 70° | 0.05" | — |
| 1983 | 96° | 68° | 82° | 0.41" | — |
| 1982 | 86° | 64° | 75° | — | — |
| 1981 | 89° | 70° | 79° | 1.78" | — |
| 1980 | 94° | 73° | 83° | — | — |
| 1979 | 83° | 58° | 70° | — | — |
| 1978 | 88° | 69° | 78° | 3.43" | — |
| 1977 | 94° | 72° | 83° | — | — |
| 1976 | 87° | 66° | 77° | — | — |
| 1974 | 95° | 69° | 82° | 0.08" | — |
| 1973 | 90° | 70° | 80° | — | — |
| 1972 | 92° | 73° | 82° | — | — |
| 1971 | 81° | 50° | 65° | — | — |
54 years of data from JOLIET