Weather on August 31 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
August 31st in Indiana Dunes National Park (via Gary, IN) typically brings warm summer weather, with average highs around 81°F and lows near 60°F. Over 55 years of records, the warmest August 31st was in 2013 (82°F average), while the coldest was 2009 (58°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 24% of August 31st dates historically, with the wettest August 31st recording 4.06" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for August 31st in Indiana Dunes? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 76°F | 54°F | 0" | 0" |
| 2024 | 88°F | 63°F | 0" | 0" |
| 2023 | 67°F | 50°F | 0" | 0" |
| 2022 | 87°F | 56°F | 0" | 0" |
| 2021 | 80°F | 63°F | 0" | 0" |
| 2020 | 84°F | 59°F | -- | -- |
| 2019 | 76°F | 55°F | -- | -- |
| 2018 | 86°F | 57°F | -- | -- |
| 2017 | 76°F | 59°F | 0" | 0" |
| 2016 | 83°F | 69°F | 0.71" | 0" |
| 2015 | 76°F | 63°F | 0" | 0" |
| 2014 | 83°F | 65°F | 1.8" | 0" |
| 2013 | 94°F | 70°F | 0.08" | 0" |
| 2012 | 87°F | 65°F | 0" | 0" |
| 2011 | 77°F | 61°F | 0.25" | 0" |
| 2010 | 89°F | 68°F | 0" | 0" |
| 2009 | 65°F | 51°F | 0.1" | 0" |
| 2008 | 86°F | 58°F | 0" | 0" |
| 2007 | 71°F | 55°F | 0" | 0" |
| 2006 | 73°F | 56°F | 0" | 0" |
| 2005 | 79°F | 66°F | 0" | 0" |
| 2004 | 75°F | 58°F | 0" | 0" |
| 2003 | 70°F | 60°F | 0" | 0" |
| 2002 | 82°F | 60°F | 0" | 0" |
| 2001 | 86°F | 67°F | 0.28" | 0" |
| 2000 | 87°F | 69°F | 0" | 0" |
| 1999 | 79°F | 54°F | 0" | 0" |
| 1998 | 80°F | 54°F | 0" | 0" |
| 1997 | 74°F | 68°F | 0" | 0" |
| 1996 | 81°F | 57°F | -- | 0" |
| 1995 | 82°F | 71°F | 0" | 0" |
| 1994 | 68°F | 59°F | 0.25" | 0" |
| 1993 | 84°F | 44°F | 1.85" | 0" |
| 1992 | 73°F | 49°F | 0" | 0" |
| 1991 | 79°F | 68°F | 0" | 0" |
| 1990 | 84°F | 52°F | 0" | 0" |
| 1989 | 80°F | 57°F | 0.33" | 0" |
| 1988 | 83°F | 56°F | 0" | 0" |
| 1987 | 82°F | 55°F | 0" | 0" |
| 1986 | 80°F | 49°F | 0" | 0" |
| 1985 | 79°F | 55°F | 0" | 0" |
| 1984 | 94°F | 51°F | 0" | 0" |
| 1983 | 85°F | 64°F | 0" | 0" |
| 1982 | 80°F | 64°F | 0" | 0" |
| 1981 | 83°F | 66°F | 0.74" | 0" |
| 1980 | 82°F | 66°F | 4.06" | 0" |
| 1979 | 88°F | 59°F | 0" | 0" |
| 1978 | 81°F | 56°F | 0" | 0" |
| 1977 | 95°F | 65°F | 0" | 0" |
| 1976 | 88°F | 58°F | 0" | 0" |
| 1975 | 71°F | 65°F | 0.99" | 0" |
| 1974 | 73°F | 60°F | 0" | 0" |
| 1973 | 89°F | 68°F | 0.53" | 0" |
| 1972 | 87°F | 62°F | 0" | 0" |
| 1971 | 87°F | 49°F | 0" | 0" |