Weather on October 21 at Indiana Dunes
Indiana Dunes National Park
INMidwest600 ft elevation
Avg High62°F
Avg Low43°F
Warmest197974°F
Coldest198736°F
Based on 55 years of data from Gary, IN
Planning Your Visit
October 21st in Indiana Dunes National Park (via Gary, IN) typically brings mild fall weather, with average highs around 62°F and lows near 43°F. Over 55 years of records, the warmest October 21st was in 1979 (74°F average), while the coldest was 1987 (36°F) — a 38°F range across recorded history. Rain or other precipitation has occurred on about 29% of October 21st dates historically, with the wettest October 21st recording 1.93" of rain. The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Indiana Dunes? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 70°F | 50°F | -- | -- |
| 2024 | 80°F | 53°F | 0" | 0" |
| 2023 | 55°F | 38°F | -- | 0" |
| 2022 | 61°F | 33°F | 0" | 0" |
| 2021 | 73°F | 51°F | 0.28" | 0" |
| 2020 | 55°F | 42°F | 0.51" | 0" |
| 2019 | 65°F | 50°F | -- | -- |
| 2018 | 51°F | 33°F | -- | -- |
| 2017 | 79°F | 54°F | 0" | 0" |
| 2016 | 59°F | 49°F | 0.03" | 0" |
| 2015 | 73°F | 53°F | 0.08" | 0" |
| 2014 | 57°F | 47°F | 0.08" | 0" |
| 2013 | 64°F | 47°F | 0.3" | 0" |
| 2012 | 60°F | 35°F | 0" | 0" |
| 2011 | 47°F | 43°F | 1.12" | 0" |
| 2010 | 68°F | 46°F | 0" | 0" |
| 2009 | 65°F | 49°F | 0.05" | 0" |
| 2008 | 62°F | 45°F | 0.51" | 0" |
| 2007 | 74°F | 49°F | 0" | 0" |
| 2006 | 65°F | 48°F | -- | -- |
| 2005 | 54°F | 44°F | 0.1" | 0" |
| 2004 | 54°F | 43°F | 0" | 0" |
| 2003 | 64°F | 55°F | 0" | 0" |
| 2002 | 48°F | 34°F | 0" | 0" |
| 2001 | 70°F | 48°F | 0" | 0" |
| 2000 | 75°F | 52°F | 0" | 0" |
| 1999 | 69°F | 36°F | 0" | 0" |
| 1998 | 55°F | 43°F | 0" | 0" |
| 1997 | 48°F | 31°F | -- | -- |
| 1996 | 66°F | 39°F | 0" | 0" |
| 1995 | 47°F | 39°F | 1.52" | 0" |
| 1994 | 71°F | 42°F | 0" | 0" |
| 1993 | 55°F | 39°F | 0.43" | 0" |
| 1992 | 57°F | 42°F | 0" | 0" |
| 1991 | 65°F | 27°F | 0" | 0" |
| 1990 | 67°F | 50°F | 0" | 0" |
| 1989 | 51°F | 31°F | 0" | 0" |
| 1988 | 53°F | 35°F | 0" | 0" |
| 1987 | 44°F | 29°F | 0" | 0" |
| 1986 | 76°F | 46°F | 0" | 0" |
| 1985 | 59°F | 48°F | 0.51" | 0" |
| 1984 | 58°F | 40°F | 1.93" | 0" |
| 1983 | 60°F | 43°F | 0.79" | 0" |
| 1982 | 45°F | 32°F | 0" | 0" |
| 1981 | 60°F | 45°F | 0" | 0" |
| 1980 | 58°F | 43°F | 0" | 0" |
| 1979 | 82°F | 66°F | 0" | 0" |
| 1978 | 84°F | 49°F | 0" | 0" |
| 1977 | 74°F | 40°F | 0" | 0" |
| 1976 | 45°F | 34°F | 0" | 0" |
| 1975 | 74°F | 49°F | 0" | 0" |
| 1974 | 54°F | 25°F | 0" | 0" |
| 1973 | 67°F | 34°F | 0" | 0" |
| 1972 | 50°F | 41°F | 0.56" | 0" |
| 1971 | 79°F | 58°F | 0" | 0" |
October 21 at Nearby Parks
Holiday Weather at Indiana Dunes
Official NPS WebsiteVisit nps.gov/indu for park information, alerts, and reservations
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