Weather on September 12
Joliet, IL
55 Years of Data
Avg High
79°F
Avg Low
56°F
Warmest
2000
80°F avg
Coldest
2014
51°F avg
About This Date
September 12th in Joliet, IL typically brings pleasant fall weather, with average highs around 79°F and lows near 56°F. Over 54 years of records, the warmest September 12th was in 2000 (80°F average), while the coldest was 2014 (51°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 28% of September 12th dates historically, with the wettest September 12th recording 3.73" of rain. The last decade has been 2.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.5°F cooler on this date compared to 20-30 years ago.
Planning for September 12th in Joliet, IL? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 56° | 71° | — | — |
| 2024 | 84° | 50° | 67° | — | — |
| 2023 | 79° | 52° | 65° | — | — |
| 2022 | 64° | 53° | 59° | 3.73" | — |
| 2021 | 84° | 62° | 73° | — | — |
| 2020 | 69° | 61° | 65° | 0.1" | — |
| 2019 | 87° | 67° | 77° | — | — |
| 2018 | 79° | 54° | 66° | — | — |
| 2017 | 74° | 52° | 63° | — | — |
| 2016 | 76° | 53° | 64° | — | — |
| 2015 | 69° | 51° | 60° | 0.69" | — |
| 2014coldest | 57° | 44° | 51° | 0.36" | — |
| 2013 | 91° | 68° | 80° | — | — |
| 2012 | 82° | 54° | 68° | — | — |
| 2011 | 82° | 58° | 70° | — | — |
| 2010 | 77° | 52° | 64° | — | — |
| 2009 | 80° | 62° | 71° | — | — |
| 2008 | 77° | 55° | 66° | 0.76" | — |
| 2007 | 77° | 51° | 64° | 0.51" | — |
| 2006 | 83° | 57° | 70° | 2.59" | — |
| 2005 | 90° | 67° | 78° | — | — |
| 2004 | 82° | 56° | 69° | — | — |
| 2003 | 84° | 62° | 73° | — | — |
| 2002 | 79° | 55° | 67° | — | — |
| 2001 | 80° | 53° | 67° | — | — |
| 2000warmest | 94° | 67° | 80° | 2.79" | — |
| 1999 | 83° | 50° | 66° | — | — |
| 1998 | 86° | 56° | 71° | — | — |
| 1997 | 72° | 53° | 62° | — | — |
| 1996 | 76° | 49° | 62° | 0.81" | — |
| 1995 | 75° | 50° | 63° | — | — |
| 1994 | 71° | 64° | 68° | — | — |
| 1993 | 70° | 45° | 57° | 0.03" | — |
| 1992 | 72° | 47° | 59° | — | — |
| 1991 | 92° | 59° | 75° | 1.45" | — |
| 1990 | 82° | 66° | 74° | — | — |
| 1989 | 76° | 54° | 65° | — | — |
| 1988 | 85° | 59° | 72° | — | — |
| 1987 | 82° | 59° | 71° | — | — |
| 1986 | 75° | 54° | 64° | 2.16" | — |
| 1985 | 70° | 50° | 60° | — | — |
| 1984 | 82° | 58° | 70° | — | — |
| 1983 | 74° | 52° | 63° | 0.08" | — |
| 1982 | 86° | 54° | 70° | — | — |
| 1981 | 82° | 63° | 72° | — | — |
| 1980 | 77° | 51° | 64° | 0.18" | — |
| 1979 | 87° | 60° | 74° | — | — |
| 1978 | 91° | 65° | 78° | — | — |
| 1977 | 77° | 51° | 64° | — | — |
| 1976 | 82° | 55° | 69° | — | — |
| 1975 | 71° | 49° | 60° | — | — |
| 1974 | 88° | 66° | 77° | 2.54" | — |
| 1973 | 78° | 47° | 62° | — | — |
| 1971 | 84° | 56° | 70° | — | — |
54 years of data from JOLIET