Weather on September 25
Naperville, IL
55 Years of Data
Avg High
74°F
Avg Low
49°F
Warmest
2007
81°F avg
Coldest
1985
50°F avg
About This Date
September 25th in Naperville, IL typically brings pleasant fall weather, with average highs around 74°F and lows near 49°F — a 25°F daily swing. Over 55 years of records, the warmest September 25th was in 2007 (81°F average), while the coldest was 1985 (50°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 33% of September 25th dates historically, with the wettest September 25th recording 3.1" of rain. The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
Planning for September 25th in Naperville, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 52° | 63° | — | — |
| 2024 | 64° | 49° | 56° | 1.17" | — |
| 2023 | 76° | 57° | 66° | 0.28" | — |
| 2022 | 65° | 52° | 58° | 0.18" | — |
| 2021 | 79° | 48° | 63° | 0.33" | — |
| 2020 | 79° | 51° | 65° | — | — |
| 2019 | 79° | 58° | 68° | 0.13" | — |
| 2018 | 71° | 50° | 61° | 0.25" | — |
| 2017 | 91° | 60° | 76° | — | — |
| 2016 | 77° | 63° | 70° | — | — |
| 2015 | 77° | 53° | 65° | — | — |
| 2014 | 74° | 47° | 60° | — | — |
| 2013 | 72° | 45° | 58° | — | — |
| 2012 | 71° | 33° | 52° | — | — |
| 2011 | 63° | 46° | 54° | 0.03" | — |
| 2010 | 69° | 50° | 60° | — | — |
| 2009 | 69° | 58° | 63° | 1.02" | — |
| 2008 | 81° | 62° | 71° | 0.46" | — |
| 2007warmest | 91° | 72° | 81° | — | — |
| 2006 | 72° | 42° | 57° | — | — |
| 2005 | 74° | 64° | 69° | 0.18" | — |
| 2004 | 82° | 47° | 64° | — | — |
| 2003 | 69° | 43° | 56° | 0.08" | — |
| 2002 | 74° | 41° | 57° | — | — |
| 2001 | 62° | 39° | 51° | — | — |
| 2000 | 56° | 45° | 50° | 0.03" | — |
| 1999 | 86° | 41° | 64° | — | — |
| 1998 | 83° | 53° | 68° | — | — |
| 1997 | 81° | 47° | 64° | — | — |
| 1996 | 70° | 39° | 54° | — | — |
| 1995 | 71° | 40° | 55° | — | — |
| 1994 | 71° | 49° | 60° | — | — |
| 1993 | 69° | 51° | 60° | — | — |
| 1992 | 76° | 43° | 59° | — | — |
| 1991 | 66° | 40° | 53° | 0.13" | — |
| 1990 | 80° | 51° | 66° | — | — |
| 1989 | 70° | 35° | 52° | — | — |
| 1988 | 79° | 42° | 60° | — | — |
| 1987 | 72° | 41° | 56° | — | — |
| 1986 | 89° | 68° | 79° | 1.88" | — |
| 1985coldest | 62° | 38° | 50° | — | — |
| 1984 | 85° | 53° | 69° | — | — |
| 1983 | 66° | 53° | 60° | — | — |
| 1982 | 63° | 49° | 56° | — | — |
| 1981 | 75° | 48° | 62° | 0.23" | — |
| 1980 | 72° | 49° | 60° | — | — |
| 1979 | 86° | 48° | 67° | — | — |
| 1978 | 80° | 48° | 64° | — | — |
| 1977 | 76° | 51° | 63° | — | — |
| 1976 | 69° | 42° | 56° | — | — |
| 1975 | 63° | 47° | 55° | — | — |
| 1974 | 73° | 47° | 60° | — | — |
| 1973 | 81° | 64° | 72° | 3.1" | — |
| 1972 | 76° | 67° | 71° | 0.23" | — |
| 1971 | 69° | 40° | 54° | 0.79" | — |
55 years of data from LISLE - MORTON ARBORETUM