Weather on August 27
Naperville, IL
55 Years of Data
Avg High
83°F
Avg Low
63°F
Warmest
1993
84°F avg
Coldest
2015
56°F avg
About This Date
August 27th in Naperville, IL typically brings warm summer weather, with average highs around 83°F and lows near 63°F. Over 54 years of records, the warmest August 27th was in 1993 (84°F average), while the coldest was 2015 (56°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 30% of August 27th dates historically, with the wettest August 27th recording 8.74" of rain. The last decade has been 3.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.5°F cooler on this date compared to 20-30 years ago.
Planning for August 27th in Naperville, IL? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Cooling Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 74° | 48° | 61° | — | — |
| 2024 | 94° | 75° | 84° | — | — |
| 2023 | 76° | 56° | 66° | — | — |
| 2022 | 78° | 53° | 66° | — | — |
| 2021 | 91° | 68° | 80° | — | — |
| 2020 | 91° | 74° | 82° | — | — |
| 2019 | 76° | 65° | 70° | 2.74" | — |
| 2018 | 92° | — | — | 0.03" | — |
| 2017 | 77° | 53° | 65° | — | — |
| 2016 | 82° | 63° | 72° | 1.88" | — |
| 2015coldest | 66° | 47° | 56° | — | — |
| 2014 | 85° | 66° | 75° | — | — |
| 2013 | 91° | 69° | 80° | — | — |
| 2012 | 78° | 64° | 71° | 8.74" | — |
| 2011 | 82° | 54° | 68° | — | — |
| 2010 | 77° | 53° | 65° | — | — |
| 2009 | 68° | 63° | 65° | 1.27" | — |
| 2008 | 70° | 51° | 60° | — | — |
| 2007 | 80° | 56° | 68° | — | — |
| 2006 | 77° | 70° | 73° | — | — |
| 2005 | 83° | 68° | 75° | — | — |
| 2004 | 85° | 68° | 76° | 1.14" | — |
| 2003 | 93° | 68° | 81° | 0.25" | — |
| 2002 | 84° | 61° | 72° | — | — |
| 2001 | 87° | 62° | 75° | — | — |
| 2000 | 83° | 64° | 73° | 0.15" | — |
| 1999 | 89° | 61° | 75° | — | — |
| 1998 | 89° | 64° | 77° | — | — |
| 1997 | 86° | 65° | 75° | — | — |
| 1996 | 86° | 62° | 74° | — | — |
| 1995 | 91° | 66° | 79° | — | — |
| 1994 | 89° | 65° | 77° | — | — |
| 1993warmest | 94° | 75° | 84° | — | — |
| 1992 | 65° | 58° | 61° | 2.67" | — |
| 1991 | 95° | 70° | 82° | — | — |
| 1990 | 93° | 70° | 81° | — | — |
| 1989 | 88° | 66° | 77° | — | — |
| 1988 | 80° | 60° | 70° | — | — |
| 1987 | 67° | 60° | 63° | 4.27" | — |
| 1985 | 82° | 55° | 69° | — | — |
| 1984 | 88° | 64° | 76° | 0.28" | — |
| 1983 | 85° | 69° | 77° | — | — |
| 1982 | 73° | 54° | 63° | — | — |
| 1981 | 80° | 65° | 72° | 0.03" | — |
| 1980 | 94° | 65° | 79° | — | — |
| 1979 | 79° | 62° | 70° | 0.79" | — |
| 1978 | 86° | 67° | 76° | — | — |
| 1977 | 90° | 73° | 81° | 1.6" | — |
| 1976 | 95° | 66° | 81° | — | — |
| 1975 | 85° | 53° | 69° | — | — |
| 1974 | 90° | 62° | 76° | 0.56" | — |
| 1973 | 96° | 70° | 83° | — | — |
| 1972 | 76° | 64° | 70° | 0.25" | — |
| 1971 | 73° | 54° | 63° | — | — |
54 years of data from LISLE - MORTON ARBORETUM