Weather on September 17
Joliet, IL
55 Years of Data
Avg High
75°F
Avg Low
53°F
Warmest
1992
77°F avg
Coldest
2007
51°F avg
About This Date
September 17th in Joliet, IL typically brings pleasant fall weather, with average highs around 75°F and lows near 53°F. Over 54 years of records, the warmest September 17th was in 1992 (77°F average), while the coldest was 2007 (51°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 19% of September 17th dates historically, with the wettest September 17th recording 5.72" of rain. The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
Planning for September 17th in Joliet, IL? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 54° | 70° | — | — |
| 2024 | 88° | 60° | 74° | — | — |
| 2023 | 73° | 50° | 62° | 2.67" | — |
| 2022 | 81° | 61° | 71° | — | — |
| 2021 | 81° | 48° | 64° | — | — |
| 2020 | 80° | 54° | 67° | — | — |
| 2019 | 78° | 65° | 71° | — | — |
| 2018 | 88° | 66° | 77° | — | — |
| 2017 | 86° | 62° | 74° | — | — |
| 2016 | 81° | 64° | 72° | 0.05" | — |
| 2015 | 82° | 57° | 70° | — | — |
| 2014 | 67° | 44° | 55° | — | — |
| 2013 | 66° | 51° | 59° | — | — |
| 2012 | 77° | 51° | 64° | — | — |
| 2011 | 60° | 41° | 51° | — | — |
| 2010 | 70° | 48° | 59° | — | — |
| 2009 | 72° | 54° | 63° | — | — |
| 2008 | 71° | 49° | 60° | — | — |
| 2007coldest | 61° | 41° | 51° | — | — |
| 2006 | 80° | 59° | 70° | — | — |
| 2005 | 69° | 52° | 60° | — | — |
| 2004 | 73° | 57° | 65° | — | — |
| 2003 | 82° | 55° | 69° | — | — |
| 2002 | 79° | 52° | 65° | — | — |
| 2001 | 74° | 52° | 63° | — | — |
| 2000 | 69° | 44° | 57° | — | — |
| 1999 | 70° | 45° | 57° | — | — |
| 1998 | 77° | 68° | 73° | — | — |
| 1997 | 86° | 66° | 76° | 3.61" | — |
| 1996 | 69° | 56° | 62° | — | — |
| 1995 | 85° | 59° | 72° | — | — |
| 1994 | 87° | 58° | 72° | — | — |
| 1993 | 61° | 52° | 56° | — | — |
| 1992warmest | 85° | 69° | 77° | — | — |
| 1991 | 80° | 52° | 66° | — | — |
| 1990 | 66° | 47° | 56° | — | — |
| 1989 | 73° | 50° | 62° | — | — |
| 1988 | 74° | 58° | 66° | — | — |
| 1987 | 76° | 66° | 71° | 1.68" | — |
| 1986 | 68° | 43° | 55° | — | — |
| 1985 | 77° | 45° | 61° | — | — |
| 1984 | 68° | 41° | 55° | — | — |
| 1983 | 71° | 47° | 59° | 0.08" | — |
| 1982 | 86° | 47° | 66° | 0.66" | — |
| 1981 | 62° | 45° | 53° | — | — |
| 1980 | 75° | 47° | 61° | 5.72" | — |
| 1979 | 76° | 47° | 61° | — | — |
| 1978 | 83° | 63° | 73° | 0.58" | — |
| 1977 | 79° | 56° | 67° | 0.76" | — |
| 1976 | 73° | 51° | 62° | — | — |
| 1975 | 69° | 55° | 62° | — | — |
| 1974 | 77° | 51° | 64° | — | — |
| 1973 | 61° | 52° | 56° | 2.34" | — |
| 1971 | 72° | 52° | 62° | — | — |
54 years of data from JOLIET