Weather on August 15 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
August 15th in Indiana Dunes National Park (via Gary, IN) typically brings warm summer weather, with average highs around 81°F and lows near 62°F. Over 55 years of records, the warmest August 15th was in 1988 (86°F average), while the coldest was 2014 (57°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 29% of August 15th dates historically, with the wettest August 15th recording 3.1" of rain. The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
Planning for August 15th in Indiana Dunes? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 83°F | 67°F | 0" | 0" |
| 2024 | 82°F | 66°F | 0.08" | 0" |
| 2023 | 76°F | 64°F | 2.57" | 0" |
| 2022 | 77°F | 58°F | 0" | 0" |
| 2021 | 79°F | 58°F | -- | -- |
| 2020 | 87°F | 64°F | -- | -- |
| 2019 | 80°F | 65°F | 0" | 0" |
| 2018 | 87°F | 67°F | 0" | -- |
| 2017 | 82°F | 65°F | 0" | 0" |
| 2016 | 82°F | 66°F | 0" | 0" |
| 2015 | 88°F | 64°F | 0.79" | 0" |
| 2014 | 68°F | 46°F | 0" | 0" |
| 2013 | 68°F | 48°F | 0" | 0" |
| 2012 | 78°F | 60°F | 0" | 0" |
| 2011 | 72°F | 63°F | 0.1" | 0" |
| 2010 | 87°F | 72°F | 0" | 0" |
| 2009 | 88°F | 61°F | 0" | 0" |
| 2008 | 74°F | 57°F | 0" | 0" |
| 2007 | 82°F | 64°F | 0.05" | 0" |
| 2006 | 77°F | 58°F | 0" | 0" |
| 2005 | 74°F | 61°F | 0.03" | 0" |
| 2004 | 68°F | 53°F | 0" | 0" |
| 2003 | 88°F | 72°F | 0" | 0" |
| 2002 | 74°F | 63°F | 0.18" | 0" |
| 2001 | 75°F | 56°F | 0" | 0" |
| 2000 | 85°F | 68°F | 0" | 0" |
| 1999 | 80°F | 50°F | 0" | 0" |
| 1998 | 74°F | 60°F | 0" | 0" |
| 1997 | 85°F | 70°F | 0.51" | 0" |
| 1996 | 77°F | 60°F | -- | 0" |
| 1995 | 89°F | 73°F | 0" | 0" |
| 1994 | 80°F | 52°F | 0" | 0" |
| 1993 | 81°F | -- | 0.08" | 0" |
| 1992 | 71°F | 55°F | 0" | 0" |
| 1991 | 86°F | 60°F | 0" | 0" |
| 1990 | 82°F | 61°F | 0" | 0" |
| 1989 | 71°F | 64°F | 0.48" | 0" |
| 1988 | 94°F | 78°F | 0" | 0" |
| 1987 | 90°F | 73°F | 0" | 0" |
| 1986 | 81°F | 70°F | 0.05" | 0" |
| 1985 | 84°F | 63°F | 3.1" | 0" |
| 1984 | 89°F | 56°F | 0" | 0" |
| 1983 | 89°F | 60°F | 0" | 0" |
| 1982 | 85°F | 58°F | 0" | 0" |
| 1981 | 90°F | 66°F | 0.41" | 0" |
| 1980 | 78°F | 63°F | 0.61" | 0" |
| 1979 | 68°F | 52°F | 0" | 0" |
| 1978 | 91°F | 68°F | 0" | 0" |
| 1977 | 82°F | 53°F | 0" | 0" |
| 1976 | 74°F | 47°F | 0" | 0" |
| 1975 | 75°F | 62°F | 2.49" | 0" |
| 1974 | 86°F | 60°F | 0" | 0" |
| 1973 | 84°F | 64°F | 0" | 0" |
| 1972 | 91°F | 64°F | 0.51" | 0" |
| 1971 | 74°F | 64°F | 0" | 0" |