Weather on August 15
Naperville, IL
55 Years of Data
Avg High
83°F
Avg Low
61°F
Warmest
1988
85°F avg
Coldest
1979
58°F avg
About This Date
August 15th in Naperville, IL typically brings warm summer weather, with average highs around 83°F and lows near 61°F. Over 54 years of records, the warmest August 15th was in 1988 (85°F average), while the coldest was 1979 (58°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 24% of August 15th dates historically, with the wettest August 15th recording 4.11" 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 August 15th in Naperville, IL? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 85° | 64° | 74° | — | — |
| 2024 | 85° | 60° | 72° | 0.41" | — |
| 2023 | 72° | 60° | 66° | 4.11" | — |
| 2022 | 78° | 65° | 71° | — | — |
| 2021 | 80° | 51° | 66° | — | — |
| 2020 | 88° | 63° | 75° | — | — |
| 2019 | 83° | 61° | 72° | — | — |
| 2018 | 87° | 65° | 76° | — | — |
| 2017 | 82° | 61° | 71° | — | — |
| 2016 | 84° | 66° | 75° | — | — |
| 2015 | 87° | 65° | 76° | 1.07" | — |
| 2014 | 74° | 47° | 60° | — | — |
| 2013 | 74° | 50° | 62° | — | — |
| 2012 | 83° | 54° | 68° | 0.03" | — |
| 2011 | 77° | 52° | 64° | — | — |
| 2010 | 90° | 72° | 81° | — | — |
| 2009 | 89° | 63° | 76° | — | — |
| 2008 | 72° | 53° | 62° | — | — |
| 2007 | 85° | 64° | 74° | 0.15" | — |
| 2006 | 83° | 55° | 69° | — | — |
| 2005 | 81° | 56° | 68° | — | — |
| 2004 | 77° | 44° | 61° | — | — |
| 2003 | 86° | 66° | 76° | — | — |
| 2002 | 87° | 60° | 74° | — | — |
| 2001 | 79° | 50° | 64° | — | — |
| 2000 | 92° | 72° | 82° | — | — |
| 1999 | 84° | 50° | 67° | — | — |
| 1998 | 87° | 65° | 76° | 0.05" | — |
| 1997 | 83° | 69° | 76° | 0.86" | — |
| 1996 | 78° | 62° | 70° | — | — |
| 1995 | 96° | 70° | 83° | 0.94" | — |
| 1994 | 78° | 52° | 65° | — | — |
| 1993 | 78° | 69° | 74° | — | — |
| 1992 | 74° | 52° | 63° | — | — |
| 1991 | 89° | 63° | 76° | — | — |
| 1990 | 83° | 64° | 73° | — | — |
| 1989 | 79° | 63° | 71° | 0.51" | — |
| 1988warmest | 95° | 76° | 85° | — | — |
| 1987 | 92° | 73° | 82° | 3.4" | — |
| 1985 | — | 62° | — | 1.04" | — |
| 1984 | 89° | 58° | 73° | — | — |
| 1983 | 89° | 65° | 77° | — | — |
| 1982 | 84° | 57° | 71° | — | — |
| 1981 | 84° | 68° | 76° | — | — |
| 1980 | 76° | 66° | 71° | 0.08" | — |
| 1979coldest | 70° | 46° | 58° | — | — |
| 1978 | 91° | 67° | 79° | — | — |
| 1977 | 81° | 54° | 67° | — | — |
| 1976 | 75° | 54° | 64° | — | — |
| 1975 | 83° | 65° | 74° | — | — |
| 1974 | 88° | 60° | 74° | — | — |
| 1973 | 86° | 57° | 72° | — | — |
| 1972 | 80° | 64° | 72° | 0.08" | — |
| 1971 | 78° | 58° | 68° | — | — |
54 years of data from LISLE - MORTON ARBORETUM