Weather on April 21 at Indiana Dunes
Indiana Dunes National Park
INMidwest600 ft elevation
Avg High62°F
Avg Low41°F
Warmest198574°F
Coldest202133°F
Based on 55 years of data from Gary, IN
Planning Your Visit
April 21st in Indiana Dunes National Park (via Gary, IN) typically brings mild spring weather, with average highs around 62°F and lows near 41°F. Over 55 years of records, the warmest April 21st was in 1985 (74°F average), while the coldest was 2021 (33°F) — a 41°F range across recorded history. Precipitation has occurred on 47% of recorded April 21st dates, with snow falling 2% of the time. The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
Planning for April 21st 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 | 69°F | 55°F | 0.1" | 0" |
| 2024 | 45°F | 39°F | 0" | 0" |
| 2023 | 81°F | 45°F | 0.13" | 0" |
| 2022 | 56°F | 40°F | 0.48" | 0" |
| 2021 | 37°F | 28°F | 0.23" | 0.3" |
| 2020 | 64°F | 36°F | 0.15" | 0" |
| 2019 | 76°F | 34°F | -- | -- |
| 2018 | 55°F | 35°F | 0" | 0" |
| 2017 | 77°F | 43°F | 0.05" | 0" |
| 2016 | 73°F | 57°F | 0.41" | 0" |
| 2015 | 50°F | 40°F | 0" | 0" |
| 2014 | 75°F | 52°F | 0" | 0" |
| 2013 | 42°F | 30°F | 0" | 0" |
| 2012 | 44°F | 39°F | 0.3" | 0" |
| 2011 | 46°F | 31°F | 0" | 0" |
| 2010 | 54°F | 27°F | 0" | 0" |
| 2009 | 49°F | 37°F | 0.46" | 0" |
| 2008 | 62°F | 43°F | 0" | 0" |
| 2007 | 62°F | 44°F | 0" | 0" |
| 2006 | 73°F | 46°F | 0" | 0" |
| 2005 | 71°F | 41°F | 0" | 0" |
| 2004 | 66°F | 47°F | 0.79" | 0" |
| 2003 | 71°F | 49°F | 0.03" | 0" |
| 2002 | 44°F | 40°F | 0.58" | 0" |
| 2001 | 74°F | 53°F | 0.51" | 0" |
| 2000 | 64°F | 39°F | 2.31" | 0" |
| 1999 | 68°F | 48°F | 1.22" | 0" |
| 1998 | 54°F | 42°F | 0" | 0" |
| 1997 | 50°F | 36°F | -- | -- |
| 1996 | 65°F | 49°F | 2.36" | 0" |
| 1995 | 53°F | 41°F | 0" | 0" |
| 1994 | 61°F | 42°F | 0" | 0" |
| 1993 | 49°F | 34°F | 0" | 0" |
| 1992 | 72°F | 47°F | 0.05" | 0" |
| 1991 | 50°F | 41°F | 0" | 0" |
| 1990 | 61°F | 43°F | 1.8" | 0" |
| 1989 | 69°F | 51°F | 0" | 0" |
| 1988 | 53°F | 27°F | 0.05" | 0" |
| 1987 | 86°F | 44°F | 0" | 0" |
| 1986 | 56°F | 26°F | 0" | 0" |
| 1985 | 87°F | 61°F | 0" | 0" |
| 1984 | 58°F | 20°F | 0" | 0" |
| 1983 | 59°F | 31°F | 0" | 0" |
| 1982 | 54°F | 32°F | -- | -- |
| 1981 | 56°F | 28°F | 0" | 0" |
| 1980 | 74°F | 35°F | 0" | 0" |
| 1979 | 66°F | 39°F | 0.58" | 0" |
| 1978 | 45°F | 35°F | 0.43" | 0" |
| 1977 | 67°F | 61°F | 3.05" | 0" |
| 1976 | 72°F | 56°F | 0.71" | 0" |
| 1975 | 51°F | 29°F | 0" | 0" |
| 1974 | 79°F | 60°F | 0" | 0" |
| 1973 | 70°F | 60°F | 2.11" | 0" |
| 1972 | 49°F | 37°F | 0.25" | 0" |
| 1971 | 71°F | 38°F | 0.3" | 0" |
April 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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