Weather on October 21
Naperville, IL
55 Years of Data
About This Date
October 21st in Naperville, IL typically brings mild fall weather, with average highs around 63°F and lows near 40°F. Over 55 years of records, the warmest October 21st was in 1979 (75°F average), while the coldest was 1976 (37°F) — a 38°F range across recorded history. Rain or other precipitation has occurred on about 25% of October 21st dates historically, with the wettest October 21st recording 1.4" 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 October 21st in Naperville, IL? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 37° | 52° | 0.03" | — |
| 2024 | 78° | 45° | 61° | — | — |
| 2023 | 60° | 36° | 48° | — | — |
| 2022 | 61° | 28° | 44° | — | — |
| 2021 | 73° | 51° | 62° | — | — |
| 2020 | 51° | 38° | 44° | 1.12" | — |
| 2019 | 66° | 43° | 54° | — | — |
| 2018 | 52° | 23° | 37° | — | — |
| 2017 | 79° | 54° | 66° | — | — |
| 2016 | 55° | 41° | 48° | — | — |
| 2015 | 78° | 55° | 67° | 0.38" | — |
| 2014 | 65° | 45° | 55° | — | — |
| 2013 | 62° | 33° | 48° | 0.25" | — |
| 2012 | 59° | 32° | 46° | — | — |
| 2011 | 46° | 34° | 40° | 0.05" | — |
| 2010 | 71° | 38° | 54° | — | — |
| 2009 | 66° | 51° | 59° | — | — |
| 2008 | 56° | 32° | 44° | 0.66" | — |
| 2007 | 74° | 46° | 60° | — | — |
| 2006 | 59° | 48° | 54° | — | — |
| 2005 | 60° | 38° | 49° | — | — |
| 2004 | 60° | 44° | 52° | — | — |
| 2003 | 65° | 48° | 56° | — | — |
| 2002 | 58° | 25° | 41° | — | — |
| 2001 | 73° | 51° | 62° | — | — |
| 2000 | 77° | 46° | 62° | — | — |
| 1999 | 70° | 30° | 50° | — | — |
| 1998 | 61° | 43° | 52° | — | — |
| 1997 | 57° | 34° | 45° | — | — |
| 1996 | 65° | 39° | 52° | — | — |
| 1995 | 46° | 37° | 42° | 0.18" | — |
| 1994 | 73° | 37° | 55° | — | — |
| 1993 | 60° | 38° | 49° | 0.79" | — |
| 1992 | 61° | 39° | 50° | — | — |
| 1991 | 67° | 38° | 52° | — | — |
| 1990 | 63° | 39° | 51° | — | — |
| 1989 | 58° | 36° | 47° | 0.2" | — |
| 1988 | 55° | 30° | 43° | 0.53" | — |
| 1987 | 44° | 31° | 37° | 0.51" | — |
| 1986 | 78° | 49° | 63° | — | — |
| 1985 | 62° | 51° | 57° | — | — |
| 1984 | — | 37° | — | 1.12" | — |
| 1983 | 56° | 47° | 51° | 0.99" | — |
| 1982 | 50° | 29° | 39° | — | — |
| 1981 | 69° | 42° | 56° | — | — |
| 1980 | 58° | 42° | 50° | — | — |
| 1979warmest | 82° | 68° | 75° | — | — |
| 1978 | 78° | 46° | 62° | — | — |
| 1977 | 75° | 44° | 60° | — | — |
| 1976coldest | 44° | 31° | 37° | — | — |
| 1975 | 74° | 39° | 56° | — | — |
| 1974 | 55° | 22° | 38° | — | — |
| 1973 | 68° | 33° | 51° | — | — |
| 1972 | 48° | 40° | 44° | 1.4" | — |
| 1971 | 80° | 56° | 68° | — | — |
Naperville, IL Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Naperville, IL Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Naperville, IL Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Naperville, IL
Naperville, IL has no months that meet our "pleasant" threshold — every season has tradeoffs.