Weather on May 31 at Indiana Dunes
Indiana Dunes National Park
Based on 53 years of data from Gary, IN
Planning Your Visit
May 31st in Indiana Dunes National Park (via Gary, IN) typically brings pleasant spring weather, with average highs around 77°F and lows near 56°F. Over 53 years of records, the warmest May 31st was in 2011 (82°F average), while the coldest was 1972 (49°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 32% of May 31st dates historically, with the wettest May 31st recording 3.51" of rain. The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
Planning for May 31st 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 | 75°F | 53°F | 0.1" | 0" |
| 2024 | 62°F | 46°F | 0" | 0" |
| 2023 | 84°F | 62°F | 0" | 0" |
| 2022 | 88°F | 72°F | -- | 0" |
| 2021 | 69°F | 52°F | -- | -- |
| 2020 | 63°F | 50°F | -- | -- |
| 2019 | 76°F | 55°F | 0" | 0" |
| 2018 | 87°F | 66°F | 1.6" | 0" |
| 2017 | 72°F | 49°F | 0.03" | 0" |
| 2016 | 84°F | 64°F | 0" | 0" |
| 2015 | 70°F | 46°F | 3.51" | 0" |
| 2014 | 76°F | 53°F | 0" | 0" |
| 2013 | 83°F | 64°F | 1.17" | 0" |
| 2012 | 65°F | 50°F | 0.03" | 0" |
| 2011 | 90°F | 74°F | 0" | 0" |
| 2010 | 91°F | 70°F | 0" | 0" |
| 2009 | 78°F | 45°F | 0" | 0" |
| 2008 | 76°F | 64°F | 0.46" | 0" |
| 2007 | 87°F | 62°F | 0" | 0" |
| 2006 | 90°F | 68°F | 0.03" | 0" |
| 2005 | 65°F | 47°F | 0" | 0" |
| 2004 | 73°F | 62°F | 3.4" | 0" |
| 2003 | 57°F | 44°F | -- | -- |
| 2002 | 83°F | 71°F | 0" | 0" |
| 2001 | 58°F | 48°F | 0" | 0" |
| 2000 | 77°F | 64°F | 0.03" | 0" |
| 1999 | 78°F | 66°F | 0.1" | 0" |
| 1997 | 66°F | 49°F | -- | 0" |
| 1996 | 76°F | 50°F | 0" | 0" |
| 1995 | 76°F | 50°F | 0" | 0" |
| 1994 | 87°F | 68°F | 0" | 0" |
| 1993 | 68°F | 45°F | 0" | 0" |
| 1992 | 71°F | 41°F | 0" | 0" |
| 1991 | 89°F | 67°F | 0" | 0" |
| 1990 | 75°F | 40°F | 0" | 0" |
| 1988 | 92°F | 58°F | 0" | 0" |
| 1987 | 86°F | 66°F | 0.81" | 0" |
| 1986 | 87°F | 61°F | 0" | 0" |
| 1985 | 82°F | 64°F | 1.17" | 0" |
| 1984 | 75°F | 45°F | 0" | 0" |
| 1983 | 60°F | 50°F | 0.38" | 0" |
| 1982 | 81°F | 61°F | 0" | 0" |
| 1981 | 73°F | 42°F | 0.08" | 0" |
| 1980 | 89°F | 64°F | 0" | 0" |
| 1979 | 81°F | 59°F | 0.36" | 0" |
| 1978 | 89°F | 56°F | 0" | 0" |
| 1977 | 90°F | 66°F | 0" | 0" |
| 1976 | 73°F | 55°F | 0" | 0" |
| 1975 | 67°F | 55°F | 0.81" | 0" |
| 1974 | 75°F | 54°F | 0" | 0" |
| 1973 | 77°F | 46°F | 0" | 0" |
| 1972 | 54°F | 44°F | 0" | 0" |
| 1971 | 79°F | 45°F | 0" | 0" |