Weather on July 15 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
July 15th in Indiana Dunes National Park (via Gary, IN) typically brings warm summer weather, with average highs around 85°F and lows near 64°F. Over 55 years of records, the warmest July 15th was in 1977 (88°F average), while the coldest was 1987 (58°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 36% of July 15th dates historically, with the wettest July 15th recording 3.61" of rain. The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for July 15th in Indiana Dunes? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 85°F | 65°F | 0" | 0" |
| 2024 | 86°F | 66°F | -- | 0" |
| 2023 | 90°F | 68°F | -- | 0" |
| 2022 | 75°F | 58°F | 0.03" | 0" |
| 2021 | 84°F | 71°F | 0.03" | 0" |
| 2020 | 84°F | 66°F | 0" | 0" |
| 2019 | 90°F | 70°F | -- | -- |
| 2018 | 89°F | 71°F | -- | -- |
| 2017 | 72°F | 60°F | 0" | 0" |
| 2016 | 87°F | 66°F | 0" | 0" |
| 2015 | 79°F | 62°F | 0" | 0" |
| 2014 | 78°F | 56°F | 0.66" | 0" |
| 2013 | 85°F | 66°F | 0" | 0" |
| 2012 | 87°F | 67°F | 3.61" | 0" |
| 2011 | 80°F | 65°F | 0" | 0" |
| 2010 | 89°F | 77°F | 0" | 0" |
| 2009 | 81°F | 61°F | 0.69" | 0" |
| 2008 | 79°F | 60°F | 0" | 0" |
| 2007 | 85°F | 60°F | 0" | 0" |
| 2006 | 81°F | 69°F | 0.2" | 0" |
| 2005 | 80°F | 70°F | 0" | 0" |
| 2004 | 75°F | 58°F | 0" | 0" |
| 2003 | 84°F | 67°F | 1.6" | 0" |
| 2002 | 84°F | 58°F | 0" | 0" |
| 2001 | 84°F | 62°F | 0" | 0" |
| 2000 | 81°F | 65°F | 0.08" | 0" |
| 1999 | 84°F | 64°F | 0" | 0" |
| 1998 | 88°F | 66°F | 0" | 0" |
| 1997 | 91°F | 66°F | 0.18" | 0" |
| 1996 | 78°F | 62°F | 0.08" | 0" |
| 1995 | 97°F | 72°F | 2.44" | 0" |
| 1994 | 85°F | 66°F | 0.36" | 0" |
| 1993 | 82°F | 56°F | 0" | 0" |
| 1992 | 73°F | 61°F | 0.05" | 0" |
| 1991 | 84°F | 52°F | 0" | 0" |
| 1990 | 63°F | 58°F | 0.36" | 0" |
| 1989 | 76°F | 59°F | 0" | 0" |
| 1988 | 101°F | 63°F | 0" | 0" |
| 1987 | 74°F | 42°F | 1.91" | 0" |
| 1986 | 90°F | 64°F | 0" | 0" |
| 1985 | 88°F | 69°F | 0" | 0" |
| 1984 | 90°F | 70°F | 0" | 0" |
| 1983 | 94°F | 69°F | 0" | 0" |
| 1982 | 87°F | 62°F | 0" | 0" |
| 1981 | 79°F | 66°F | 0.58" | 0" |
| 1980 | 97°F | -- | 0" | 0" |
| 1979 | 88°F | 67°F | 0.08" | 0" |
| 1978 | 83°F | 63°F | 0" | 0" |
| 1977 | 98°F | 77°F | 0" | 0" |
| 1976 | 96°F | 67°F | 1.6" | 0" |
| 1975 | 85°F | 57°F | 0" | 0" |
| 1974 | 85°F | 67°F | 0" | 0" |
| 1973 | 87°F | 55°F | 0" | 0" |
| 1972 | 89°F | 66°F | 2.77" | 0" |
| 1971 | 82°F | 59°F | 0.05" | 0" |