Weather on August 20
Naperville, IL
55 Years of Data
Avg High
83°F
Avg Low
61°F
Warmest
1980
83°F avg
Coldest
1985
62°F avg
About This Date
August 20th 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 20th was in 1980 (83°F average), while the coldest was 1985 (62°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 37% of August 20th dates historically, with the wettest August 20th recording 4.52" of rain. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Naperville, IL? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Cooling Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 63° | 70° | — | — |
| 2024 | — | 59° | — | — | — |
| 2023 | 81° | 58° | 69° | — | — |
| 2022 | 84° | 64° | 74° | 2.03" | — |
| 2021 | 87° | 64° | 76° | — | — |
| 2020 | 82° | 54° | 68° | — | — |
| 2019 | 85° | 67° | 76° | 0.08" | — |
| 2018 | 85° | 68° | 76° | — | — |
| 2017 | 84° | 57° | 71° | — | — |
| 2016 | 85° | 69° | 77° | 0.36" | — |
| 2015 | 76° | 59° | 67° | — | — |
| 2014 | 85° | 62° | 73° | — | — |
| 2013 | 84° | 57° | 71° | — | — |
| 2012 | 80° | 51° | 66° | — | — |
| 2011 | 88° | 61° | 74° | — | — |
| 2010 | 88° | 65° | 76° | — | — |
| 2009 | 78° | 61° | 69° | 0.15" | — |
| 2008 | 76° | 56° | 66° | — | — |
| 2007 | 70° | 62° | 66° | 4.52" | — |
| 2006 | 79° | 58° | 68° | — | — |
| 2005 | 88° | 71° | 79° | 2.18" | — |
| 2004 | 74° | 54° | 64° | — | — |
| 2003 | 89° | 62° | 76° | — | — |
| 2002 | 76° | 52° | 64° | — | — |
| 2001 | 83° | 55° | 69° | 0.03" | — |
| 2000 | 80° | 58° | 69° | — | — |
| 1999 | 81° | 55° | 68° | 0.08" | — |
| 1998 | 88° | 55° | 71° | — | — |
| 1997 | 72° | 62° | 67° | 0.03" | — |
| 1996 | 86° | 68° | 77° | 0.08" | — |
| 1995 | 86° | 71° | 79° | — | — |
| 1994 | 88° | 67° | 77° | 1.37" | — |
| 1993 | 82° | 66° | 74° | 0.2" | — |
| 1992 | 80° | 47° | 63° | — | — |
| 1991 | 75° | 58° | 66° | 0.2" | — |
| 1990 | 88° | 69° | 78° | 3.63" | — |
| 1989 | 86° | 66° | 76° | 0.86" | — |
| 1988 | 85° | 65° | 75° | — | — |
| 1987 | 85° | 57° | 71° | — | — |
| 1985coldest | 72° | 52° | 62° | — | — |
| 1984 | 84° | 53° | 69° | — | — |
| 1983 | 93° | 70° | 81° | — | — |
| 1982 | 87° | 72° | 79° | 0.03" | — |
| 1981 | 81° | 50° | 65° | 1.88" | — |
| 1980warmest | 93° | 73° | 83° | — | — |
| 1979 | 80° | 67° | 73° | 3.58" | — |
| 1978 | 81° | 50° | 65° | — | — |
| 1977 | 73° | 55° | 64° | 0.08" | — |
| 1976 | 88° | 52° | 70° | — | — |
| 1975 | 80° | 59° | 70° | 0.38" | — |
| 1974 | 89° | 62° | 76° | — | — |
| 1973 | 85° | 65° | 75° | — | — |
| 1972 | 86° | 65° | 75° | — | — |
| 1971 | 94° | 64° | 79° | — | — |
54 years of data from WHEATON 3 SE