Weather on October 20
Naperville, IL
55 Years of Data
Avg High
62°F
Avg Low
39°F
Warmest
1979
69°F avg
Coldest
1972
35°F avg
About This Date
October 20th in Naperville, IL typically brings mild fall weather, with average highs around 62°F and lows near 39°F. Over 55 years of records, the warmest October 20th was in 1979 (69°F average), while the coldest was 1972 (35°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 25% of October 20th dates historically, with the wettest October 20th recording 3.71" of rain. The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
Planning for October 20th in Naperville, IL? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | — | 35° | — | — | — |
| 2024 | 70° | 36° | 53° | — | — |
| 2023 | 56° | 49° | 52° | 0.48" | — |
| 2022 | 47° | 27° | 37° | — | — |
| 2021 | 72° | 46° | 59° | — | — |
| 2020 | 51° | 37° | 44° | 0.23" | — |
| 2019 | 69° | 43° | 56° | — | — |
| 2018 | 59° | 27° | 43° | 0.25" | — |
| 2017 | 70° | 45° | 57° | — | — |
| 2016 | 72° | 46° | 59° | 0.08" | — |
| 2015 | 74° | 50° | 62° | — | — |
| 2014 | 56° | 30° | 43° | — | — |
| 2013 | 53° | 33° | 43° | — | — |
| 2012 | 52° | 37° | 44° | 3.18" | — |
| 2011 | 48° | 40° | 44° | 1.17" | — |
| 2010 | 62° | 31° | 46° | — | — |
| 2009 | 59° | 47° | 53° | 0.2" | — |
| 2008 | 62° | 42° | 52° | — | — |
| 2007 | 59° | 45° | 52° | 0.13" | — |
| 2006 | 54° | 26° | 40° | — | — |
| 2005 | 55° | 43° | 49° | — | — |
| 2004 | 53° | 50° | 52° | 0.03" | — |
| 2003 | 85° | 52° | 68° | — | — |
| 2002 | 54° | 25° | 39° | — | — |
| 2001 | 72° | 43° | 57° | — | — |
| 2000 | 80° | 50° | 65° | — | — |
| 1999 | 62° | 32° | 47° | — | — |
| 1998 | 67° | 35° | 51° | — | — |
| 1997 | 66° | 36° | 51° | — | — |
| 1996 | 64° | 28° | 46° | — | — |
| 1995 | 80° | 43° | 61° | 3.71" | — |
| 1994 | 73° | 46° | 60° | — | — |
| 1993 | 65° | 48° | 56° | — | — |
| 1992 | 60° | 35° | 48° | 0.28" | — |
| 1991 | 55° | 26° | 41° | — | — |
| 1990 | 67° | 35° | 51° | — | — |
| 1989 | 38° | 32° | 35° | 1.47" | — |
| 1988 | 53° | 30° | 42° | — | — |
| 1987 | 55° | 30° | 43° | 0.25" | — |
| 1986 | 74° | 37° | 55° | — | — |
| 1985 | 59° | 53° | 56° | — | — |
| 1984 | — | 38° | — | — | — |
| 1983 | 53° | 47° | 50° | — | — |
| 1982 | 62° | 38° | 50° | 1.78" | — |
| 1981 | 71° | 43° | 57° | — | — |
| 1980 | 60° | 43° | 51° | — | — |
| 1979warmest | 76° | 63° | 69° | — | — |
| 1978 | 73° | 36° | 54° | — | — |
| 1977 | 65° | 32° | 48° | — | — |
| 1976 | 46° | 30° | 38° | — | — |
| 1975 | 72° | 37° | 54° | — | — |
| 1974 | 51° | 35° | 43° | — | — |
| 1973 | 62° | 38° | 50° | — | — |
| 1972coldest | 49° | 22° | 35° | — | — |
| 1971 | 80° | 50° | 65° | — | — |
55 years of data from WHEATON 3 SE