Weather on October 20 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
October 20th in Indiana Dunes National Park (via Gary, IN) typically brings mild fall weather, with average highs around 60°F and lows near 41°F. Over 55 years of records, the warmest October 20th was in 1979 (69°F average), while the coldest was 1989 (36°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 31% of October 20th dates historically, with the wettest October 20th recording 4.27" of rain. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for October 20th in Indiana Dunes? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 61°F | 30°F | -- | -- |
| 2024 | 76°F | 48°F | 0" | 0" |
| 2023 | 59°F | 52°F | 0.61" | 0" |
| 2022 | 49°F | 28°F | 0" | 0" |
| 2021 | 72°F | 48°F | 0" | 0" |
| 2020 | 52°F | 40°F | 0.1" | 0" |
| 2019 | 57°F | 50°F | -- | -- |
| 2018 | 55°F | 38°F | -- | -- |
| 2017 | 64°F | 48°F | 0" | 0" |
| 2016 | 68°F | 53°F | 0.25" | 0" |
| 2015 | 69°F | 47°F | 0" | 0" |
| 2014 | 55°F | 36°F | 0.13" | 0" |
| 2013 | 54°F | 39°F | 0" | 0" |
| 2012 | 55°F | 38°F | 0.28" | 0" |
| 2011 | 48°F | 45°F | 4.27" | 0" |
| 2010 | 59°F | 41°F | 0" | 0" |
| 2009 | 67°F | 44°F | 0" | 0" |
| 2008 | 62°F | 45°F | 0" | 0" |
| 2007 | 59°F | 49°F | 0" | 0" |
| 2006 | 45°F | 37°F | 0" | 0" |
| 2005 | 57°F | 45°F | 0" | 0" |
| 2004 | 52°F | 46°F | 0" | 0" |
| 2003 | 65°F | 50°F | 0" | 0" |
| 2002 | 50°F | 33°F | 0" | 0" |
| 2001 | 61°F | 42°F | 0" | 0" |
| 2000 | 76°F | 51°F | 0" | 0" |
| 1999 | 53°F | 31°F | 0" | 0" |
| 1998 | 67°F | 36°F | 0" | 0" |
| 1997 | 63°F | 33°F | -- | -- |
| 1996 | 60°F | 29°F | 0" | 0" |
| 1995 | 57°F | 39°F | 0" | 0" |
| 1994 | 61°F | 41°F | 0" | 0" |
| 1993 | 58°F | 52°F | 1.02" | 0" |
| 1992 | 58°F | 33°F | 0.08" | 0" |
| 1991 | 53°F | 39°F | 0" | 0" |
| 1990 | 67°F | 40°F | 0.03" | 0" |
| 1989 | 39°F | 33°F | 3.1" | 0" |
| 1988 | 52°F | 34°F | 0" | 0" |
| 1987 | 57°F | 39°F | 1.09" | 0" |
| 1986 | 70°F | 34°F | 0" | 0" |
| 1985 | 61°F | 52°F | 0" | 0" |
| 1984 | 62°F | 32°F | 0.3" | 0" |
| 1983 | 51°F | 44°F | 0.84" | 0" |
| 1982 | 58°F | 35°F | 1.14" | 0" |
| 1981 | 60°F | 40°F | 0" | 0" |
| 1980 | 59°F | 44°F | 0" | 0" |
| 1979 | 78°F | 60°F | 0" | 0" |
| 1978 | 74°F | 35°F | 0" | 0" |
| 1977 | 64°F | 34°F | 0" | 0" |
| 1976 | 46°F | 39°F | 0.3" | 0" |
| 1975 | 71°F | 42°F | 0.08" | 0" |
| 1974 | 51°F | 33°F | 0.36" | 0" |
| 1973 | 75°F | 51°F | 0" | 0" |
| 1972 | 50°F | 23°F | 0" | 0" |
| 1971 | 81°F | 51°F | 0" | 0" |