Weather on May 21 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
May 21st in Indiana Dunes National Park (via Gary, IN) typically brings pleasant spring weather, with average highs around 73°F and lows near 49°F. Over 55 years of records, the warmest May 21st was in 1975 (79°F average), while the coldest was 2002 (38°F) — a 41°F range across recorded history. Rain or other precipitation has occurred on about 35% of May 21st dates historically, with the wettest May 21st recording 3.99" of rain. The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
Planning for May 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 | 57°F | 47°F | 0.74" | 0" |
| 2024 | 87°F | 59°F | 0.81" | 0" |
| 2023 | 61°F | 44°F | 0" | 0" |
| 2022 | 86°F | 54°F | -- | 0" |
| 2021 | 83°F | 62°F | 0" | 0" |
| 2020 | 65°F | 54°F | 0" | 0" |
| 2019 | 51°F | 41°F | 0.56" | 0" |
| 2018 | 71°F | 42°F | -- | 0" |
| 2017 | 66°F | 52°F | 1.07" | 0" |
| 2016 | 69°F | 48°F | 0" | 0" |
| 2015 | 49°F | 40°F | 0.23" | 0" |
| 2014 | 83°F | 63°F | 3.99" | 0" |
| 2013 | 87°F | 61°F | 2.74" | 0" |
| 2012 | 90°F | 55°F | 1.09" | 0" |
| 2011 | 69°F | 52°F | 0" | 0" |
| 2010 | 76°F | 40°F | 0.56" | 0" |
| 2009 | 83°F | 60°F | 0" | 0" |
| 2008 | 63°F | 45°F | 0.05" | 0" |
| 2007 | 55°F | 43°F | 0.51" | 0" |
| 2006 | 73°F | 47°F | 0" | 0" |
| 2005 | 70°F | 42°F | 0" | 0" |
| 2004 | 84°F | 50°F | 0.71" | 0" |
| 2003 | 59°F | 41°F | -- | -- |
| 2002 | 45°F | 31°F | 0" | 0" |
| 2001 | 67°F | 67°F | 0.08" | 0" |
| 2000 | 57°F | 42°F | 0" | 0" |
| 1999 | 79°F | 53°F | 0" | 0" |
| 1998 | 70°F | 51°F | 0.03" | 0" |
| 1997 | 55°F | 33°F | -- | 0" |
| 1996 | 80°F | 50°F | -- | 0" |
| 1995 | 75°F | 43°F | -- | 0" |
| 1994 | 75°F | 47°F | 0" | 0" |
| 1993 | 69°F | 50°F | 0" | 0" |
| 1992 | 85°F | 58°F | 0" | 0" |
| 1991 | 83°F | 53°F | 0" | 0" |
| 1990 | 65°F | 49°F | 0.08" | 0" |
| 1989 | 79°F | 48°F | 0" | 0" |
| 1988 | 80°F | 54°F | 0" | 0" |
| 1987 | 90°F | 56°F | 0" | 0" |
| 1986 | 63°F | 43°F | 0" | 0" |
| 1985 | 67°F | 47°F | 0" | 0" |
| 1984 | 76°F | 44°F | 0" | 0" |
| 1983 | 76°F | 49°F | 0" | 0" |
| 1982 | 69°F | 43°F | 0.43" | 0" |
| 1981 | 82°F | 42°F | 0" | 0" |
| 1980 | 76°F | 57°F | 0" | 0" |
| 1979 | 68°F | 42°F | 0.03" | 0" |
| 1978 | 81°F | 41°F | 0" | 0" |
| 1977 | 90°F | 64°F | 0" | 0" |
| 1976 | 86°F | 50°F | 0" | 0" |
| 1975 | 91°F | 67°F | 0.89" | 0" |
| 1974 | 85°F | 61°F | 0.48" | 0" |
| 1973 | 75°F | 42°F | 0" | 0" |
| 1972 | 84°F | 56°F | 0" | 0" |
| 1971 | 70°F | 40°F | 0" | 0" |