Weather on September 30
Naperville, IL
55 Years of Data
Avg High
74°F
Avg Low
47°F
Warmest
1971
76°F avg
Coldest
1972
45°F avg
About This Date
September 30th in Naperville, IL typically brings pleasant fall weather, with average highs around 74°F and lows near 47°F — a 27°F daily swing. Over 55 years of records, the warmest September 30th was in 1971 (76°F average), while the coldest was 1972 (45°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 18% of September 30th dates historically, with the wettest September 30th recording 5.03" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 30th in Naperville, IL? Great weather for outdoor activities.
Cooling Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 89° | 54° | 71° | — | — |
| 2024 | 73° | 56° | 64° | 0.03" | — |
| 2023 | 73° | 49° | 61° | — | — |
| 2022 | 63° | 37° | 50° | — | — |
| 2021 | 84° | 56° | 70° | — | — |
| 2020 | 60° | 45° | 52° | — | — |
| 2019 | 67° | 60° | 63° | 0.3" | — |
| 2018 | 58° | 35° | 46° | 0.1" | — |
| 2017 | 70° | 42° | 56° | — | — |
| 2016 | 64° | 59° | 62° | 0.94" | — |
| 2015 | 63° | 48° | 55° | — | — |
| 2014 | 82° | 48° | 65° | — | — |
| 2013 | 68° | 41° | 55° | — | — |
| 2012 | 79° | 41° | 60° | — | — |
| 2011 | 67° | 48° | 57° | 0.36" | — |
| 2010 | 77° | 49° | 63° | — | — |
| 2009 | 63° | 42° | 52° | — | — |
| 2008 | 63° | 49° | 56° | 1.3" | — |
| 2007 | 81° | 47° | 64° | — | — |
| 2006 | 69° | 28° | 49° | 0.2" | — |
| 2005 | 71° | 38° | 54° | — | — |
| 2004 | 72° | 34° | 53° | — | — |
| 2003 | 60° | 39° | 50° | — | — |
| 2002 | 86° | 66° | 76° | — | — |
| 2001 | 76° | 41° | 58° | — | — |
| 2000 | 80° | 49° | 64° | — | — |
| 1999 | 72° | 37° | 54° | — | — |
| 1998 | 78° | 51° | 65° | 0.36" | — |
| 1997 | 76° | 55° | 65° | — | — |
| 1996 | 80° | 46° | 63° | — | — |
| 1995 | 86° | 51° | 69° | — | — |
| 1994 | 85° | 49° | 67° | — | — |
| 1993 | 64° | 30° | 47° | — | — |
| 1992 | 70° | 38° | 54° | — | — |
| 1991 | 82° | 55° | 69° | — | — |
| 1990 | 70° | 42° | 56° | — | — |
| 1989 | 80° | 41° | 61° | — | — |
| 1988 | 80° | 57° | 69° | — | — |
| 1987 | 69° | 48° | 59° | — | — |
| 1986 | 71° | 64° | 68° | 5.03" | — |
| 1985 | 70° | 37° | 53° | 0.46" | — |
| 1984 | 62° | 30° | 46° | — | — |
| 1983 | 82° | 49° | 65° | — | — |
| 1982 | 86° | 53° | 70° | — | — |
| 1981 | 85° | 54° | 69° | — | — |
| 1980 | 80° | 47° | 63° | — | — |
| 1979 | 83° | 58° | 70° | — | — |
| 1978 | 73° | 58° | 65° | — | — |
| 1977 | 73° | 52° | 62° | — | — |
| 1976 | 75° | 42° | 59° | — | — |
| 1975 | 74° | 45° | 59° | — | — |
| 1974 | 65° | 40° | 52° | — | — |
| 1973 | 69° | 55° | 62° | — | — |
| 1972coldest | 56° | 35° | 45° | — | — |
| 1971warmest | 91° | 60° | 76° | — | — |
55 years of data from LISLE - MORTON ARBORETUM