Weather on June 21
Naperville, IL
55 Years of Data
Avg High
85°F
Avg Low
60°F
Warmest
1988
85°F avg
Coldest
1992
53°F avg
About This Date
June 21st in Naperville, IL typically brings warm summer weather, with average highs around 85°F and lows near 60°F — a 25°F daily swing. Over 55 years of records, the warmest June 21st was in 1988 (85°F average), while the coldest was 1992 (53°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 45% of June 21st dates historically, with the wettest June 21st recording 3.28" of rain. The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
Planning for June 21st in Naperville, IL? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 66° | 75° | — | — |
| 2024 | 89° | 67° | 78° | 0.48" | — |
| 2023 | 85° | 56° | 70° | — | — |
| 2022 | 95° | 68° | 82° | — | — |
| 2021 | 82° | 62° | 72° | 1.65" | — |
| 2020 | 85° | 67° | 76° | 0.61" | — |
| 2019 | 71° | 48° | 60° | 0.03" | — |
| 2018 | 79° | 63° | 71° | 1.4" | — |
| 2017 | 80° | 50° | 65° | 0.51" | — |
| 2016 | 91° | 57° | 74° | 0.05" | — |
| 2015 | 80° | 57° | 69° | 0.84" | — |
| 2014 | 85° | 61° | 73° | — | — |
| 2013 | 87° | 60° | 74° | — | — |
| 2012 | 94° | 74° | 84° | 0.03" | — |
| 2011 | 79° | 68° | 73° | 0.53" | — |
| 2010 | 81° | 64° | 72° | — | — |
| 2009 | 88° | 67° | 77° | — | — |
| 2008 | 82° | 57° | 70° | 3.28" | — |
| 2007 | 85° | 59° | 72° | — | — |
| 2006 | 86° | 70° | 78° | 0.38" | — |
| 2005 | 90° | 59° | 74° | — | — |
| 2004 | 73° | 55° | 64° | — | — |
| 2003 | 81° | 43° | 62° | — | — |
| 2002 | 94° | 68° | 81° | — | — |
| 2001 | 80° | 60° | 70° | 0.25" | — |
| 2000 | 82° | 68° | 75° | 0.89" | — |
| 1999 | 85° | 59° | 72° | — | — |
| 1998 | 90° | 69° | 79° | — | — |
| 1997 | 90° | 71° | 80° | 0.81" | — |
| 1996 | 86° | 67° | 76° | — | — |
| 1995 | 96° | 69° | 83° | — | — |
| 1994 | 92° | 70° | 81° | 2.62" | — |
| 1993 | 83° | 63° | 73° | 0.13" | — |
| 1992coldest | 68° | 38° | 53° | — | — |
| 1991 | 94° | 62° | 78° | — | — |
| 1990 | 83° | 59° | 71° | 0.03" | — |
| 1989 | 83° | 58° | 70° | — | — |
| 1988warmest | 101° | 70° | 85° | 1.91" | — |
| 1987 | 86° | 69° | 78° | 2.13" | — |
| 1986 | 94° | — | — | — | — |
| 1985 | 86° | 58° | 72° | 0.23" | — |
| 1984 | 89° | 61° | 75° | — | — |
| 1983 | 91° | 60° | 76° | — | — |
| 1982 | 76° | 48° | 62° | 0.03" | — |
| 1981 | 81° | 56° | 68° | 0.28" | — |
| 1980 | 82° | 49° | 65° | — | — |
| 1979 | 92° | — | — | — | — |
| 1978 | 75° | 53° | 64° | 0.97" | — |
| 1977 | 81° | 48° | 64° | — | — |
| 1976 | 79° | 47° | 63° | — | — |
| 1975 | 90° | 62° | 76° | — | — |
| 1974 | 88° | 64° | 76° | 1.09" | — |
| 1973 | 80° | 56° | 68° | — | — |
| 1972 | 76° | 48° | 62° | — | — |
| 1971 | 79° | 57° | 68° | — | — |
55 years of data from WHEATON 3 SE