Weather on July 21
Joliet, IL
55 Years of Data
Avg High
86°F
Avg Low
66°F
Warmest
2011
87°F avg
Coldest
2009
63°F avg
About This Date
July 21st 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 21st was in 2011 (87°F average), while the coldest was 2009 (63°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 43% of July 21st dates historically, with the wettest July 21st recording 12.37" of rain. The last decade has been 1.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.6°F cooler on this date compared to 20-30 years ago.
Planning for July 21st in Joliet, IL? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Cooling Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 66° | 75° | — | — |
| 2024 | 80° | 61° | 70° | — | — |
| 2023 | 86° | 64° | 75° | — | — |
| 2022 | 85° | 64° | 74° | — | — |
| 2021 | 83° | 65° | 74° | — | — |
| 2020 | 83° | 66° | 74° | — | — |
| 2019 | 92° | 72° | 82° | — | — |
| 2018 | 76° | 67° | 71° | 1.78" | — |
| 2017 | 87° | 69° | 78° | 3.35" | — |
| 2016 | 85° | 68° | 76° | — | — |
| 2015 | 85° | 64° | 74° | — | — |
| 2014 | 81° | 61° | 71° | — | — |
| 2013 | 89° | 69° | 79° | — | — |
| 2012 | 83° | 65° | 74° | — | — |
| 2011warmest | 98° | 76° | 87° | — | — |
| 2010 | 83° | 68° | 75° | — | — |
| 2009coldest | 77° | 48° | 63° | — | — |
| 2008 | 85° | 68° | 76° | — | — |
| 2007 | 76° | 59° | 67° | — | — |
| 2006 | 78° | 69° | 74° | 1.17" | — |
| 2005 | 89° | 57° | 73° | 5.08" | — |
| 2004 | 88° | 69° | 78° | 0.13" | — |
| 2003 | 86° | 65° | 75° | 1.04" | — |
| 2002 | 89° | 74° | 81° | — | — |
| 2001 | 92° | 72° | 82° | — | — |
| 2000 | 76° | 58° | 67° | — | — |
| 1999 | 87° | 72° | 79° | 0.15" | — |
| 1998 | 88° | 72° | 80° | — | — |
| 1997 | 91° | 68° | 80° | 0.08" | — |
| 1996 | 77° | 62° | 70° | 0.64" | — |
| 1995 | 77° | 69° | 73° | 0.2" | — |
| 1994 | 89° | 69° | 79° | 2.46" | — |
| 1993 | 86° | 64° | 75° | — | — |
| 1992 | 72° | 60° | 66° | 0.89" | — |
| 1991 | 94° | 71° | 82° | — | — |
| 1990 | 81° | 63° | 72° | 0.28" | — |
| 1989 | 74° | 64° | 69° | 0.25" | — |
| 1988 | 79° | 65° | 72° | — | — |
| 1987 | 94° | 67° | 80° | 2.36" | — |
| 1986 | 90° | 64° | 77° | — | — |
| 1985 | 87° | 66° | 77° | — | — |
| 1984 | 85° | 62° | 73° | 0.03" | — |
| 1983 | 98° | 70° | 84° | 0.76" | — |
| 1982 | 84° | 66° | 75° | — | — |
| 1981 | 87° | 64° | 76° | 0.23" | — |
| 1980 | 98° | 66° | 82° | 0.08" | — |
| 1979 | 84° | 60° | 72° | — | — |
| 1978 | 91° | 70° | 80° | 3.45" | — |
| 1977 | 92° | 71° | 81° | 0.15" | — |
| 1976 | 94° | 66° | 80° | 12.37" | — |
| 1974 | 93° | 68° | 81° | — | — |
| 1973 | 79° | 67° | 73° | 0.41" | — |
| 1972 | 93° | 75° | 84° | — | — |
| 1971 | 87° | 67° | 77° | — | — |
54 years of data from JOLIET