Weather on May 20
Joliet, IL
55 Years of Data
Avg High
75°F
Avg Low
51°F
Warmest
1996
81°F avg
Coldest
2000
45°F avg
About This Date
May 20th in Joliet, IL typically brings pleasant spring weather, with average highs around 75°F and lows near 51°F. Over 53 years of records, the warmest May 20th was in 1996 (81°F average), while the coldest was 2000 (45°F) — a 36°F range across recorded history. Rain or other precipitation has occurred on about 30% of May 20th dates historically, with the wettest May 20th recording 2.79" of rain. The last decade has been 2.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.2°F cooler on this date compared to 20-30 years ago.
Planning for May 20th in Joliet, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 61° | 52° | 57° | 0.94" | — |
| 2024 | 79° | 57° | 68° | — | — |
| 2023 | 72° | 45° | 58° | — | — |
| 2022 | 84° | 53° | 69° | — | — |
| 2021 | 73° | 59° | 66° | — | — |
| 2020 | 61° | 48° | 54° | 0.05" | — |
| 2019 | 86° | 49° | 67° | — | — |
| 2018 | 78° | 48° | 63° | — | — |
| 2017 | 51° | 43° | 47° | 0.71" | — |
| 2016 | 71° | 42° | 57° | — | — |
| 2015 | 56° | 41° | 48° | — | — |
| 2014 | 85° | 60° | 72° | 0.13" | — |
| 2013 | 87° | 64° | 76° | — | — |
| 2012 | 90° | 61° | 75° | — | — |
| 2011 | 78° | 52° | 65° | — | — |
| 2010 | 73° | 47° | 60° | — | — |
| 2009 | 79° | 52° | 65° | — | — |
| 2008 | 64° | 42° | 53° | 0.15" | — |
| 2007 | 79° | 51° | 65° | — | — |
| 2006 | 65° | 41° | 53° | — | — |
| 2005 | 76° | 52° | 64° | 1.52" | — |
| 2004 | 74° | 50° | 62° | — | — |
| 2003 | 75° | 52° | 63° | 1.4" | — |
| 2002 | 58° | 42° | 50° | 1.37" | — |
| 2001 | 79° | 60° | 69° | — | — |
| 2000coldest | 48° | 41° | 45° | — | — |
| 1999 | 75° | 49° | 62° | — | — |
| 1998 | 91° | 64° | 78° | 0.33" | — |
| 1997 | 66° | 43° | 54° | — | — |
| 1996warmest | 91° | 71° | 81° | — | — |
| 1995 | 75° | 42° | 59° | — | — |
| 1994 | 71° | 44° | 58° | — | — |
| 1993 | 71° | 40° | 55° | — | — |
| 1992 | 79° | 51° | 65° | — | — |
| 1991 | 76° | 59° | 67° | — | — |
| 1990 | 72° | 55° | 63° | 1.02" | — |
| 1989 | 69° | 59° | 64° | 2.79" | — |
| 1988 | 77° | 50° | 64° | — | — |
| 1987 | 85° | 60° | 72° | — | — |
| 1986 | 60° | 39° | 50° | 0.03" | — |
| 1985 | 81° | 45° | 63° | — | — |
| 1984 | 82° | 55° | 69° | 2.08" | — |
| 1983 | 67° | 52° | 59° | 0.81" | — |
| 1981 | 65° | 39° | 52° | — | — |
| 1980 | 70° | 48° | 59° | 0.08" | — |
| 1979 | 75° | 47° | 61° | 0.05" | — |
| 1978 | 81° | 61° | 71° | — | — |
| 1977 | 91° | 63° | 77° | — | — |
| 1976 | 76° | 50° | 63° | — | — |
| 1974 | 81° | 55° | 68° | — | — |
| 1973 | 73° | 45° | 59° | — | — |
| 1972 | 89° | 52° | 70° | — | — |
| 1971 | 85° | 50° | 67° | — | — |
53 years of data from JOLIET