Weather on September 27
Joliet, IL
55 Years of Data
Avg High
74°F
Avg Low
51°F
Warmest
1998
80°F avg
Coldest
1984
46°F avg
About This Date
September 27th in Joliet, IL typically brings pleasant fall weather, with average highs around 74°F and lows near 51°F. Over 54 years of records, the warmest September 27th was in 1998 (80°F average), while the coldest was 1984 (46°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 27th dates historically, with the wettest September 27th recording 3.81" of rain. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
Planning for September 27th in Joliet, IL? Great weather for outdoor activities.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 89° | 55° | 72° | — | — |
| 2024 | 78° | 55° | 67° | — | — |
| 2023 | 74° | 61° | 67° | 0.25" | — |
| 2022 | 63° | 44° | 53° | — | — |
| 2021 | 81° | 49° | 65° | — | — |
| 2020 | 79° | 60° | 69° | — | — |
| 2019 | 72° | 55° | 63° | — | — |
| 2018 | 67° | 45° | 56° | — | — |
| 2017 | 89° | 63° | 76° | — | — |
| 2016 | 70° | 52° | 61° | — | — |
| 2015 | 77° | 58° | 67° | — | — |
| 2014 | 81° | 55° | 68° | — | — |
| 2013 | 79° | 53° | 66° | — | — |
| 2012 | 70° | 51° | 60° | — | — |
| 2011 | 61° | 52° | 56° | 1.63" | — |
| 2010 | 60° | 45° | 52° | — | — |
| 2009 | 68° | 44° | 56° | 0.15" | — |
| 2008 | 79° | 54° | 66° | — | — |
| 2007 | 90° | 55° | 72° | 0.56" | — |
| 2006 | 72° | 52° | 62° | — | — |
| 2005 | 73° | 53° | 63° | — | — |
| 2004 | 71° | 49° | 60° | — | — |
| 2003 | 65° | 44° | 54° | 2.11" | — |
| 2002 | 77° | 53° | 65° | — | — |
| 2001 | 68° | 41° | 55° | — | — |
| 2000 | 68° | 39° | 54° | — | — |
| 1999 | 86° | 57° | 72° | 0.56" | — |
| 1998warmest | 91° | 68° | 80° | — | — |
| 1997 | 72° | 51° | 61° | — | — |
| 1996 | 66° | 52° | 59° | 3.81" | — |
| 1995 | 75° | 49° | 62° | — | — |
| 1994 | 63° | 50° | 56° | 0.08" | — |
| 1993 | 67° | 47° | 57° | 0.25" | — |
| 1992 | 70° | 50° | 60° | 1.65" | — |
| 1991 | 58° | 36° | 47° | — | — |
| 1990 | 83° | 54° | 68° | — | — |
| 1989 | 62° | 41° | 52° | — | — |
| 1988 | 81° | 53° | 67° | — | — |
| 1987 | 83° | 46° | 64° | — | — |
| 1986 | 86° | 69° | 78° | — | — |
| 1985 | 60° | 43° | 51° | — | — |
| 1984coldest | 56° | 37° | 46° | — | — |
| 1983 | 74° | 49° | 61° | — | — |
| 1982 | 67° | 48° | 57° | — | — |
| 1981 | 74° | 49° | 61° | 1.14" | — |
| 1980 | 68° | 39° | 54° | — | — |
| 1979 | 83° | 49° | 66° | — | — |
| 1978 | — | 44° | — | — | — |
| 1977 | 77° | 48° | 63° | — | — |
| 1976 | 59° | 56° | 57° | 0.64" | — |
| 1975 | 66° | 44° | 55° | — | — |
| 1974 | 83° | 54° | 68° | — | — |
| 1973 | 85° | 67° | 76° | — | — |
| 1971 | 88° | 68° | 78° | — | — |
54 years of data from JOLIET