Weather on September 1
Naperville, IL
55 Years of Data
Avg High
83°F
Avg Low
59°F
Warmest
2000
82°F avg
Coldest
1974
59°F avg
About This Date
September 1st in Naperville, IL typically brings warm fall weather, with average highs around 83°F and lows near 59°F. Over 55 years of records, the warmest September 1st was in 2000 (82°F average), while the coldest was 1974 (59°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 20% of September 1st dates historically, with the wettest September 1st recording 6.68" of rain. The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
Planning for September 1st in Naperville, IL? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 51° | 65° | — | — |
| 2024 | 82° | 60° | 71° | — | — |
| 2023 | 78° | 47° | 62° | — | — |
| 2022 | 84° | 62° | 73° | — | — |
| 2021 | 83° | 61° | 72° | — | — |
| 2020 | 83° | 62° | 72° | — | — |
| 2019 | 76° | 53° | 64° | 1.65" | — |
| 2018 | 85° | 60° | 72° | — | — |
| 2017 | 74° | 53° | 63° | — | — |
| 2016 | 78° | 57° | 68° | — | — |
| 2015 | 86° | 60° | 73° | — | — |
| 2014 | 85° | 69° | 77° | 0.03" | — |
| 2013 | 77° | 63° | 70° | 4.29" | — |
| 2012 | 92° | 66° | 79° | — | — |
| 2011 | 88° | 64° | 76° | — | — |
| 2010 | 92° | 71° | 81° | 0.71" | — |
| 2009 | 73° | 44° | 59° | — | — |
| 2008 | 84° | 53° | 69° | — | — |
| 2007 | 78° | 52° | 65° | — | — |
| 2006 | 76° | 62° | 69° | — | — |
| 2005 | 84° | 57° | 71° | — | — |
| 2004 | 82° | 49° | 65° | — | — |
| 2003 | 64° | 60° | 62° | 1.17" | — |
| 2002 | 87° | 59° | 73° | — | — |
| 2001 | 76° | 49° | 62° | — | — |
| 2000warmest | 96° | 68° | 82° | — | — |
| 1999 | 88° | 53° | 70° | — | — |
| 1998 | 82° | 59° | 71° | — | — |
| 1997 | 87° | 55° | 71° | — | — |
| 1996 | 85° | 61° | 73° | — | — |
| 1995 | 87° | 62° | 75° | — | — |
| 1994 | 71° | 48° | 60° | — | — |
| 1993 | 79° | 52° | 65° | 0.25" | — |
| 1992 | 80° | 48° | 64° | — | — |
| 1991 | 75° | 58° | 66° | — | — |
| 1990 | 90° | 67° | 78° | — | — |
| 1989 | 74° | 65° | 69° | 6.68" | — |
| 1988 | 85° | 60° | 72° | — | — |
| 1987 | 77° | 47° | 62° | — | — |
| 1986 | 86° | 53° | 70° | — | — |
| 1985 | 85° | 65° | 75° | — | — |
| 1984 | 93° | 57° | 75° | — | — |
| 1983 | 86° | 58° | 72° | — | — |
| 1982 | 84° | 64° | 74° | 0.89" | — |
| 1981 | 84° | 67° | 75° | 0.36" | — |
| 1980 | 78° | 66° | 72° | 2.41" | — |
| 1979 | 85° | 65° | 75° | — | — |
| 1978 | 86° | 54° | 70° | — | — |
| 1977 | 88° | 68° | 78° | 4.78" | — |
| 1976 | 89° | 59° | 74° | — | — |
| 1975 | 85° | 57° | 71° | — | — |
| 1974coldest | 71° | 46° | 59° | — | — |
| 1973 | 91° | 71° | 81° | — | — |
| 1972 | 86° | 63° | 74° | — | — |
| 1971 | 85° | 61° | 73° | — | — |
55 years of data from WHEATON 3 SE