Weather on May 21
Naperville, IL
55 Years of Data
Avg High
75°F
Avg Low
49°F
Warmest
2013
76°F avg
Coldest
2002
46°F avg
About This Date
May 21st in Naperville, IL typically brings pleasant spring weather, with average highs around 75°F and lows near 49°F — a 26°F daily swing. Over 55 years of records, the warmest May 21st was in 2013 (76°F average), while the coldest was 2002 (46°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 31% of May 21st dates historically, with the wettest May 21st recording 5.36" 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 May 21st in Naperville, IL? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 55° | 45° | 50° | 0.51" | — |
| 2024 | 85° | 59° | 72° | — | — |
| 2023 | 70° | 42° | 56° | — | — |
| 2022 | 85° | 55° | 70° | 2.03" | — |
| 2021 | 85° | 64° | 74° | — | — |
| 2020 | 66° | 55° | 61° | — | — |
| 2019 | 57° | 43° | 50° | 0.2" | — |
| 2018 | 57° | 45° | 51° | 1.65" | — |
| 2017 | 64° | 48° | 56° | 0.86" | — |
| 2016 | 68° | 48° | 58° | — | — |
| 2015 | 52° | 42° | 47° | 0.08" | — |
| 2014 | 87° | 62° | 75° | 2.74" | — |
| 2013warmest | 90° | 62° | 76° | 5.36" | — |
| 2012 | 91° | 56° | 73° | 0.48" | — |
| 2011 | 77° | 52° | 64° | — | — |
| 2010 | 74° | 46° | 60° | 0.84" | — |
| 2009 | 82° | 56° | 69° | — | — |
| 2008 | 65° | 37° | 51° | — | — |
| 2007 | 59° | 42° | 51° | 0.08" | — |
| 2006 | 73° | 49° | 61° | — | — |
| 2005 | 74° | 43° | 58° | — | — |
| 2004 | 85° | 52° | 68° | 0.03" | — |
| 2003 | 66° | 36° | 51° | — | — |
| 2002coldest | 64° | 28° | 46° | — | — |
| 2001 | 80° | 61° | 70° | 0.36" | — |
| 2000 | 72° | 42° | 57° | — | — |
| 1999 | 81° | 57° | 69° | — | — |
| 1998 | 81° | 50° | 65° | — | — |
| 1997 | 65° | 34° | 49° | — | — |
| 1996 | 79° | 53° | 66° | 0.79" | — |
| 1995 | 76° | 47° | 61° | — | — |
| 1994 | 88° | 47° | 67° | — | — |
| 1993 | 69° | 41° | 55° | — | — |
| 1992 | 89° | 56° | 72° | — | — |
| 1991 | 85° | 55° | 70° | — | — |
| 1990 | 59° | 46° | 53° | — | — |
| 1989 | 81° | 44° | 62° | — | — |
| 1988 | 86° | 50° | 68° | — | — |
| 1987 | 90° | 56° | 73° | — | — |
| 1986 | 67° | 47° | 57° | — | — |
| 1985 | 72° | 43° | 57° | — | — |
| 1984 | 76° | 49° | 62° | — | — |
| 1983 | 76° | 49° | 62° | — | — |
| 1982 | 63° | 43° | 53° | — | — |
| 1981 | 82° | 44° | 63° | — | — |
| 1980 | 82° | 44° | 63° | — | — |
| 1979 | 61° | 41° | 51° | — | — |
| 1978 | 75° | 42° | 59° | — | — |
| 1977 | 89° | 59° | 74° | 1.02" | — |
| 1976 | 81° | 55° | 68° | — | — |
| 1975 | 85° | 63° | 74° | 0.69" | — |
| 1974 | 84° | 62° | 73° | 0.3" | — |
| 1973 | 75° | 40° | 57° | — | — |
| 1972 | 90° | — | — | — | — |
| 1971 | 71° | 39° | 55° | — | — |
55 years of data from WHEATON 3 SE