Weather on September 23
Naperville, IL
55 Years of Data
Avg High
73°F
Avg Low
49°F
Warmest
2017
79°F avg
Coldest
1974
42°F avg
About This Date
September 23rd in Naperville, IL typically brings pleasant fall weather, with average highs around 73°F and lows near 49°F. Over 55 years of records, the warmest September 23rd was in 2017 (79°F average), while the coldest was 1974 (42°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 23rd dates historically, with the wettest September 23rd recording 2.72" of rain. The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
Planning for September 23rd in Naperville, IL? Great weather for outdoor activities.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 64° | 73° | — | — |
| 2024 | 70° | 54° | 62° | 1.65" | — |
| 2023 | 75° | 59° | 67° | 0.05" | — |
| 2022 | 65° | 43° | 54° | — | — |
| 2021 | 63° | 49° | 56° | — | — |
| 2020 | 79° | 50° | 64° | — | — |
| 2019 | 76° | 58° | 67° | 2.49" | — |
| 2018 | 65° | 42° | 53° | — | — |
| 2017warmest | 94° | 64° | 79° | — | — |
| 2016 | 82° | 63° | 72° | — | — |
| 2015 | 80° | 49° | 64° | — | — |
| 2014 | 68° | 41° | 55° | — | — |
| 2013 | 68° | 42° | 55° | — | — |
| 2012 | — | 33° | — | — | — |
| 2011 | 65° | 40° | 52° | — | — |
| 2010 | 74° | 63° | 68° | — | — |
| 2009 | 76° | 59° | 67° | — | — |
| 2008 | 81° | 50° | 65° | — | — |
| 2007 | 76° | 45° | 60° | — | — |
| 2006 | 72° | 60° | 66° | 0.61" | — |
| 2005 | 88° | 61° | 74° | — | — |
| 2004 | 85° | 51° | 68° | — | — |
| 2003 | 69° | 45° | 57° | 0.18" | — |
| 2002 | 71° | 38° | 54° | — | — |
| 2001 | 78° | 57° | 68° | 0.2" | — |
| 2000 | 70° | 58° | 64° | 2.72" | — |
| 1999 | 83° | 42° | 62° | — | — |
| 1998 | 71° | 40° | 55° | — | — |
| 1997 | 70° | 45° | 57° | — | — |
| 1996 | 70° | 45° | 57° | — | — |
| 1995 | 55° | 28° | 42° | — | — |
| 1994 | 71° | 57° | 64° | 1.04" | — |
| 1993 | 71° | 54° | 62° | — | — |
| 1992 | 64° | 37° | 51° | — | — |
| 1991 | 70° | 35° | 52° | — | — |
| 1990 | 71° | 41° | 56° | — | — |
| 1989 | 78° | 77° | 78° | — | — |
| 1988 | 83° | 56° | 69° | — | — |
| 1987 | 75° | 48° | 62° | — | — |
| 1986 | 87° | 70° | 78° | — | — |
| 1985 | 74° | 62° | 68° | 0.79" | — |
| 1984 | 75° | 64° | 70° | — | — |
| 1983 | 60° | 33° | 47° | — | — |
| 1982 | 69° | 39° | 54° | — | — |
| 1981 | 68° | 36° | 52° | — | — |
| 1980 | 68° | 44° | 56° | 1.55" | — |
| 1979 | 69° | 36° | 52° | — | — |
| 1978 | 72° | 40° | 56° | — | — |
| 1977 | 68° | 53° | 61° | 0.03" | — |
| 1976 | 71° | 49° | 60° | — | — |
| 1975 | 71° | 39° | 55° | — | — |
| 1974coldest | 58° | 27° | 42° | — | — |
| 1973 | 75° | 51° | 63° | — | — |
| 1972 | 61° | 48° | 54° | 0.25" | — |
| 1971 | 71° | 50° | 61° | — | — |
55 years of data from LISLE - MORTON ARBORETUM