Weather on May 18 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
May 18th in Indiana Dunes National Park (via Gary, IN) typically brings pleasant spring weather, with average highs around 72°F and lows near 50°F. Over 55 years of records, the warmest May 18th was in 1996 (80°F average), while the coldest was 2002 (41°F) — a 39°F range across recorded history. Rain or other precipitation has occurred on about 33% of May 18th dates historically, with the wettest May 18th recording 6.68" of rain. The last decade has been 4.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.7°F cooler on this date compared to 20-30 years ago.
Planning for May 18th 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 | 70°F | 54°F | 0" | 0" |
| 2024 | 76°F | 57°F | 0" | 0" |
| 2023 | 61°F | 42°F | 0" | 0" |
| 2022 | 61°F | 53°F | 0.1" | 0" |
| 2021 | 69°F | 58°F | 0" | 0" |
| 2020 | 66°F | 50°F | -- | -- |
| 2019 | 85°F | 45°F | -- | -- |
| 2018 | 70°F | 44°F | 0" | 0" |
| 2017 | 84°F | 64°F | 0.1" | 0" |
| 2016 | 51°F | 38°F | 0.03" | 0" |
| 2015 | 79°F | 69°F | 0.13" | 0" |
| 2014 | 62°F | 41°F | 0" | 0" |
| 2013 | 73°F | 55°F | 0" | 0" |
| 2012 | 70°F | 52°F | 0" | 0" |
| 2011 | 52°F | 45°F | 0.08" | 0" |
| 2010 | 54°F | 48°F | 0.97" | 0" |
| 2009 | 58°F | 36°F | 0" | 0" |
| 2008 | 69°F | 47°F | 0.84" | 0" |
| 2007 | 54°F | 37°F | 0" | 0" |
| 2006 | 72°F | 45°F | 0.99" | 0" |
| 2005 | 72°F | 53°F | 0" | 0" |
| 2004 | 80°F | 57°F | 1.63" | 0" |
| 2003 | 74°F | 56°F | -- | -- |
| 2002 | 43°F | 39°F | 0" | 0" |
| 2001 | 83°F | 56°F | 0" | 0" |
| 2000 | 70°F | 52°F | 0.05" | 0" |
| 1999 | 68°F | 45°F | 0" | 0" |
| 1998 | 85°F | 63°F | 0" | 0" |
| 1997 | 79°F | 56°F | -- | 0" |
| 1996 | 90°F | 70°F | -- | 0" |
| 1995 | 63°F | 40°F | 0.38" | 0" |
| 1994 | 61°F | 44°F | 0" | 0" |
| 1993 | 68°F | 45°F | 0.08" | 0" |
| 1992 | 78°F | 44°F | 0" | 0" |
| 1991 | 60°F | 46°F | 1.75" | 0" |
| 1990 | 72°F | 50°F | 0" | 0" |
| 1989 | 80°F | 56°F | 0" | 0" |
| 1988 | 69°F | 38°F | 0" | 0" |
| 1987 | 90°F | 59°F | 6.68" | 0" |
| 1986 | 83°F | 42°F | 1.09" | 0" |
| 1985 | 57°F | 41°F | 0.1" | 0" |
| 1984 | 90°F | 59°F | 0" | 0" |
| 1983 | 67°F | 43°F | 0.18" | 0" |
| 1982 | 89°F | 62°F | 0" | 0" |
| 1981 | 57°F | 41°F | 0" | 0" |
| 1980 | 68°F | 47°F | 0" | 0" |
| 1979 | 85°F | 51°F | 0" | 0" |
| 1978 | 79°F | 50°F | 0" | 0" |
| 1977 | 90°F | 65°F | 0" | 0" |
| 1976 | 60°F | 43°F | 0" | 0" |
| 1975 | 88°F | 45°F | 0" | 0" |
| 1974 | 64°F | 46°F | 0.64" | 0" |
| 1973 | 70°F | 36°F | 0" | 0" |
| 1972 | 85°F | 50°F | 0" | 0" |
| 1971 | 87°F | 66°F | 0" | 0" |