Weather on September 12
Joliet, IL
55 Years of Data
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° | — | — |
Joliet, IL Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Joliet, IL Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Joliet, IL Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Joliet, IL
Joliet, IL has no months that meet our "pleasant" threshold — every season has tradeoffs.