Weather on September 12
Naperville, IL
55 Years of Data
Avg High
79°F
Avg Low
55°F
Warmest
2005
80°F avg
Coldest
2014
51°F avg
About This Date
September 12th in Naperville, IL typically brings pleasant fall weather, with average highs around 79°F and lows near 55°F. Over 55 years of records, the warmest September 12th was in 2005 (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 27% of September 12th dates historically, with the wettest September 12th recording 9.27" of rain. The last decade has been 2.3°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.3°F cooler on this date compared to 20-30 years ago.
Planning for September 12th in Naperville, IL? Great weather for outdoor activities.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 55° | 68° | — | — |
| 2024 | 85° | 49° | 67° | — | — |
| 2023 | 64° | 52° | 58° | 2.18" | — |
| 2022 | 69° | 53° | 61° | 9.27" | — |
| 2021 | 86° | 62° | 74° | — | — |
| 2020 | 65° | 59° | 62° | 0.1" | — |
| 2019 | 88° | 67° | 77° | 0.46" | — |
| 2018 | 80° | 53° | 67° | — | — |
| 2017 | 76° | 47° | 61° | — | — |
| 2016 | 77° | 50° | 64° | — | — |
| 2015 | 59° | — | — | 0.38" | — |
| 2014coldest | 54° | 48° | 51° | 0.05" | — |
| 2013 | 90° | 62° | 76° | — | — |
| 2012 | 83° | 54° | 68° | — | — |
| 2011 | 82° | 57° | 70° | — | — |
| 2010 | 76° | 49° | 62° | 0.58" | — |
| 2009 | 80° | 55° | 68° | — | — |
| 2008 | 72° | 53° | 62° | — | — |
| 2007 | 71° | 41° | 56° | — | — |
| 2006 | 71° | 61° | 66° | 2.72" | — |
| 2005warmest | 92° | 68° | 80° | — | — |
| 2004 | 85° | 54° | 69° | — | — |
| 2003 | 83° | 62° | 72° | — | — |
| 2002 | 79° | 46° | 62° | — | — |
| 2001 | 87° | 54° | 70° | — | — |
| 2000 | 74° | 59° | 66° | 6.12" | — |
| 1999 | 85° | 56° | 70° | — | — |
| 1998 | 90° | 53° | 71° | — | — |
| 1997 | 78° | 46° | 62° | — | — |
| 1996 | 74° | 46° | 60° | 0.18" | — |
| 1995 | 78° | 52° | 65° | — | — |
| 1994 | 87° | 62° | 75° | — | — |
| 1993 | 81° | 56° | 68° | 0.2" | — |
| 1992 | 75° | 46° | 61° | — | — |
| 1991 | 85° | 61° | 73° | 0.81" | — |
| 1990 | 86° | 63° | 74° | — | — |
| 1989 | 75° | 52° | 63° | — | — |
| 1988 | 83° | 70° | 76° | — | — |
| 1987 | 84° | 56° | 70° | — | — |
| 1986 | 75° | 55° | 65° | 2.21" | — |
| 1985 | 69° | 44° | 57° | — | — |
| 1984 | 86° | 55° | 71° | — | — |
| 1983 | 79° | 50° | 64° | — | — |
| 1982 | 87° | 66° | 77° | — | — |
| 1981 | 86° | 59° | 73° | — | — |
| 1980 | 76° | 60° | 68° | — | — |
| 1979 | 87° | 59° | 73° | — | — |
| 1978 | 87° | 69° | 78° | — | — |
| 1977 | 76° | 55° | 65° | — | — |
| 1976 | 84° | 45° | 64° | — | — |
| 1975 | 66° | 43° | 54° | — | — |
| 1974 | 85° | 65° | 75° | 0.86" | — |
| 1973 | 77° | 45° | 61° | — | — |
| 1972 | 74° | 64° | 69° | 0.38" | — |
| 1971 | 74° | 53° | 63° | — | — |
55 years of data from LISLE - MORTON ARBORETUM