Weather on September 15
Naperville, IL
55 Years of Data
Avg High
77°F
Avg Low
52°F
Warmest
1991
81°F avg
Coldest
2011
46°F avg
About This Date
September 15th in Naperville, IL typically brings pleasant fall weather, with average highs around 77°F and lows near 52°F — a 25°F daily swing. Over 55 years of records, the warmest September 15th was in 1991 (81°F average), while the coldest was 2011 (46°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 20% of September 15th dates historically, with the wettest September 15th recording 2.49" of rain. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for September 15th in Naperville, IL? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 85° | 55° | 70° | — | — |
| 2024 | 88° | 62° | 75° | — | — |
| 2023 | 73° | 43° | 58° | — | — |
| 2022 | 80° | 54° | 67° | — | — |
| 2021 | 87° | 53° | 70° | — | — |
| 2020 | 75° | 52° | 63° | — | — |
| 2019 | 81° | 53° | 67° | 1.47" | — |
| 2018 | 86° | 58° | 72° | — | — |
| 2017 | 81° | 56° | 68° | — | — |
| 2016 | 76° | 55° | 65° | — | — |
| 2015 | 82° | 55° | 69° | — | — |
| 2014 | 66° | 38° | 52° | — | — |
| 2013 | 72° | 47° | 59° | — | — |
| 2012 | 75° | 45° | 60° | 0.03" | — |
| 2011coldest | 58° | 35° | 46° | — | — |
| 2010 | 82° | 50° | 66° | — | — |
| 2009 | 84° | 42° | 63° | — | — |
| 2008 | 65° | 54° | 59° | 2.01" | — |
| 2007 | 65° | 35° | 50° | — | — |
| 2006 | 77° | 51° | 64° | — | — |
| 2005 | 78° | 51° | 65° | — | — |
| 2004 | 86° | 69° | 78° | — | — |
| 2003 | 74° | 49° | 61° | 1.17" | — |
| 2002 | 79° | 63° | 71° | — | — |
| 2001 | 70° | 48° | 59° | — | — |
| 2000 | 82° | 48° | 65° | 0.2" | — |
| 1999 | 72° | 40° | 56° | — | — |
| 1998 | 76° | 68° | 72° | 1.32" | — |
| 1997 | 85° | 56° | 70° | — | — |
| 1996 | 68° | 37° | 53° | — | — |
| 1995 | 80° | 50° | 65° | — | — |
| 1994 | 90° | 69° | 79° | — | — |
| 1993 | 61° | 50° | 55° | 1.12" | — |
| 1992 | 84° | 68° | 76° | 2.49" | — |
| 1991warmest | 90° | 73° | 81° | — | — |
| 1990 | 75° | 50° | 63° | 0.23" | — |
| 1989 | 70° | 45° | 57° | — | — |
| 1988 | 82° | 52° | 67° | — | — |
| 1987 | 80° | 62° | 71° | — | — |
| 1986 | 82° | 60° | 71° | — | — |
| 1985 | 75° | 40° | 57° | — | — |
| 1984 | 65° | 45° | 55° | — | — |
| 1983 | 72° | 49° | 60° | — | — |
| 1982 | 68° | 60° | 64° | — | — |
| 1981 | 75° | 51° | 63° | — | — |
| 1980 | 65° | 56° | 60° | — | — |
| 1979 | 70° | 43° | 56° | — | — |
| 1978 | 84° | 54° | 69° | 0.66" | — |
| 1977 | 69° | 51° | 60° | 0.08" | — |
| 1976 | 78° | 58° | 68° | — | — |
| 1975 | 69° | 50° | 60° | — | — |
| 1974 | 76° | 46° | 61° | — | — |
| 1973 | 79° | 45° | 62° | — | — |
| 1972 | — | 48° | — | — | — |
| 1971 | 90° | 54° | 72° | — | — |
55 years of data from WHEATON 3 SE