Weather on July 31 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
July 31st in Indiana Dunes National Park (via Gary, IN) typically brings warm summer weather, with average highs around 82°F and lows near 62°F. Over 55 years of records, the warmest July 31st was in 1980 (83°F average), while the coldest was 1971 (63°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 33% of July 31st dates historically, with the wettest July 31st recording 2.54" of rain. The last decade has been 1.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.7°F cooler on this date compared to 20-30 years ago.
Planning for July 31st 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 | 62°F | 2.08" | 0" |
| 2024 | 88°F | 69°F | 0" | 0" |
| 2023 | 77°F | 56°F | 0" | 0" |
| 2022 | 81°F | 61°F | 0" | 0" |
| 2021 | 80°F | 58°F | -- | -- |
| 2020 | 81°F | 61°F | 0" | 0" |
| 2019 | 75°F | 64°F | 0" | 0" |
| 2018 | 76°F | 60°F | 0" | -- |
| 2017 | 80°F | 60°F | 0" | 0" |
| 2016 | 79°F | 64°F | 0" | 0" |
| 2015 | 87°F | 64°F | 0" | 0" |
| 2014 | 76°F | 56°F | 0" | 0" |
| 2013 | 74°F | 62°F | 0.05" | 0" |
| 2012 | 88°F | 64°F | 1.37" | 0" |
| 2011 | 85°F | 66°F | 0" | 0" |
| 2010 | 78°F | 64°F | 0.91" | 0" |
| 2009 | 79°F | 59°F | 0.08" | 0" |
| 2008 | 87°F | 69°F | 0" | 0" |
| 2007 | 79°F | 63°F | 0" | 0" |
| 2006 | 88°F | 72°F | 0.71" | 0" |
| 2005 | 80°F | 64°F | 0" | 0" |
| 2004 | 73°F | 64°F | 0.28" | 0" |
| 2003 | 81°F | 61°F | 0" | 0" |
| 2002 | 91°F | 70°F | 0" | 0" |
| 2001 | 87°F | 68°F | 0" | 0" |
| 2000 | 75°F | 65°F | 0.2" | 0" |
| 1999 | 91°F | 72°F | 0.25" | 0" |
| 1998 | 83°F | 57°F | 0" | 0" |
| 1997 | 82°F | 56°F | -- | 0" |
| 1996 | 71°F | 57°F | 0.03" | 0" |
| 1995 | 92°F | 71°F | 0.03" | 0" |
| 1994 | 81°F | 51°F | 0" | 0" |
| 1993 | 83°F | 57°F | 0" | 0" |
| 1992 | 71°F | 58°F | 2.54" | 0" |
| 1991 | 89°F | 56°F | 0" | 0" |
| 1990 | 72°F | 60°F | 0" | 0" |
| 1989 | 71°F | 65°F | 1.09" | 0" |
| 1988 | 94°F | 65°F | 0" | 0" |
| 1987 | 88°F | 71°F | 0.43" | -- |
| 1986 | 88°F | 58°F | 0" | 0" |
| 1985 | 72°F | 64°F | 1.5" | 0" |
| 1984 | 86°F | 53°F | 0" | 0" |
| 1983 | 89°F | 71°F | 0.13" | 0" |
| 1982 | 84°F | 59°F | 0" | 0" |
| 1981 | 81°F | 54°F | 0" | 0" |
| 1980 | 93°F | 73°F | 0" | 0" |
| 1979 | 79°F | 69°F | 0" | 0" |
| 1978 | 80°F | 57°F | 0" | 0" |
| 1977 | 90°F | 66°F | 0.15" | 0" |
| 1976 | 85°F | 64°F | 0" | 0" |
| 1975 | 93°F | 63°F | 0" | 0" |
| 1974 | 80°F | 57°F | 0" | 0" |
| 1973 | 80°F | 68°F | 0.13" | 0" |
| 1972 | 84°F | 56°F | 0" | 0" |
| 1971 | 76°F | 51°F | 0" | 0" |