Weather on May 15 at Indiana Dunes
Indiana Dunes National Park
Based on 54 years of data from Gary, IN
Planning Your Visit
May 15th in Indiana Dunes National Park (via Gary, IN) typically brings mild spring weather, with average highs around 69°F and lows near 49°F. Over 54 years of records, the warmest May 15th was in 2007 (78°F average), while the coldest was 1983 (44°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 48% of May 15th dates historically, with the wettest May 15th recording 5.23" of rain. The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
Planning for May 15th 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 | 58°F | 0" | 0" |
| 2024 | 59°F | 52°F | 0.1" | 0" |
| 2023 | 69°F | 50°F | 0.1" | 0" |
| 2022 | 77°F | 57°F | -- | 0" |
| 2021 | 63°F | 47°F | -- | -- |
| 2020 | 73°F | 59°F | -- | -- |
| 2019 | 68°F | 45°F | 0" | 0" |
| 2018 | 86°F | 56°F | 0.89" | 0" |
| 2017 | 62°F | 48°F | 0" | 0" |
| 2016 | 49°F | 41°F | 0" | 0" |
| 2015 | 66°F | 53°F | 0.13" | 0" |
| 2014 | 48°F | 39°F | 1.37" | 0" |
| 2013 | 83°F | 60°F | 0.03" | 0" |
| 2012 | 74°F | 49°F | 0" | 0" |
| 2011 | 48°F | 44°F | 5.23" | 0" |
| 2010 | 69°F | 47°F | 0" | 0" |
| 2009 | 70°F | 51°F | 0" | 0" |
| 2008 | 61°F | 40°F | 0.05" | 0" |
| 2007 | 89°F | 67°F | 0" | 0" |
| 2006 | 53°F | 45°F | 1.35" | 0" |
| 2005 | 65°F | 45°F | 0" | 0" |
| 2004 | 68°F | 45°F | 2.26" | 0" |
| 2003 | 54°F | 47°F | -- | -- |
| 2002 | 60°F | 40°F | 0" | 0" |
| 2000 | 62°F | 40°F | 0" | 0" |
| 1999 | 74°F | 58°F | 0" | 0" |
| 1998 | 87°F | 65°F | 0" | 0" |
| 1997 | 57°F | 40°F | 0.13" | 0" |
| 1996 | 59°F | 48°F | -- | 0" |
| 1995 | 76°F | 52°F | -- | 0" |
| 1994 | 69°F | 50°F | 1.22" | 0" |
| 1993 | 77°F | 54°F | 0" | 0" |
| 1992 | 75°F | 39°F | 0" | 0" |
| 1991 | 86°F | 55°F | 0" | 0" |
| 1990 | 68°F | 52°F | 1.27" | 0" |
| 1989 | 64°F | 42°F | 0" | 0" |
| 1988 | 87°F | 63°F | 0" | 0" |
| 1987 | 80°F | 47°F | 0.74" | 0" |
| 1986 | 71°F | 50°F | 0.53" | 0" |
| 1985 | 89°F | 61°F | 1.32" | 0" |
| 1984 | 64°F | 38°F | 0" | 0" |
| 1983 | 54°F | 35°F | 0.08" | 0" |
| 1982 | 91°F | 55°F | 0.38" | 0" |
| 1981 | 61°F | 42°F | 0.23" | 0" |
| 1980 | 60°F | 41°F | 0.05" | 0" |
| 1979 | 65°F | 44°F | 0.1" | 0" |
| 1978 | 55°F | 42°F | 0.81" | 0" |
| 1977 | 86°F | 57°F | 0" | 0" |
| 1976 | 67°F | 51°F | 0.69" | 0" |
| 1975 | 73°F | 52°F | 0.08" | 0" |
| 1974 | 68°F | 48°F | 1.47" | 0" |
| 1973 | 64°F | 35°F | 0" | 0" |
| 1972 | 64°F | 48°F | 0.43" | 0" |
| 1971 | 80°F | 53°F | 0" | 0" |