Weather on July 21 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
July 21st in Indiana Dunes National Park (via Gary, IN) typically brings warm summer weather, with average highs around 84°F and lows near 66°F. Over 55 years of records, the warmest July 21st was in 2011 (85°F average), while the coldest was 1992 (62°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 29% of July 21st dates historically, with the wettest July 21st recording 4.95" of rain. The last decade has been 2.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.5°F cooler on this date compared to 20-30 years ago.
Planning for July 21st in Indiana Dunes? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 77°F | 65°F | -- | 0" |
| 2024 | 78°F | 58°F | 0" | 0" |
| 2023 | 86°F | 66°F | 0" | 0" |
| 2022 | 89°F | 68°F | 0" | 0" |
| 2021 | 84°F | 64°F | 0" | 0" |
| 2020 | 80°F | 65°F | 0" | 0" |
| 2019 | 81°F | 71°F | -- | -- |
| 2018 | 75°F | 68°F | -- | -- |
| 2017 | 87°F | 68°F | 0.94" | 0" |
| 2016 | 90°F | 70°F | 0" | 0" |
| 2015 | 87°F | 68°F | 0" | 0" |
| 2014 | 78°F | 60°F | 0" | 0" |
| 2013 | 82°F | 66°F | 0" | 0" |
| 2012 | 77°F | 61°F | 0" | 0" |
| 2011 | 97°F | 74°F | 0" | 0" |
| 2010 | 82°F | 71°F | 0" | 0" |
| 2009 | 75°F | 59°F | 0" | 0" |
| 2008 | 84°F | 68°F | 0" | 0" |
| 2007 | 71°F | 62°F | 0" | 0" |
| 2006 | 80°F | 69°F | 0.41" | 0" |
| 2005 | 89°F | 70°F | 0.38" | 0" |
| 2004 | 87°F | 71°F | 0" | 0" |
| 2003 | 85°F | 68°F | 3.48" | 0" |
| 2002 | 88°F | 74°F | 0" | 0" |
| 2001 | 91°F | 72°F | 0.05" | 0" |
| 2000 | 74°F | 63°F | 0" | 0" |
| 1999 | 95°F | 73°F | -- | 0" |
| 1998 | 88°F | 75°F | 0" | 0" |
| 1997 | 80°F | 69°F | 1.83" | 0" |
| 1996 | 73°F | 60°F | 0.03" | 0" |
| 1995 | 84°F | 66°F | -- | 0" |
| 1994 | 91°F | 68°F | 4.95" | 0" |
| 1993 | 77°F | 60°F | 0" | 0" |
| 1992 | 68°F | 56°F | 0" | 0" |
| 1991 | 90°F | 75°F | 0" | 0" |
| 1990 | 77°F | 61°F | 0.08" | 0" |
| 1989 | 74°F | 63°F | 0.86" | 0" |
| 1988 | 84°F | 58°F | 0" | 0" |
| 1987 | 94°F | 66°F | 1.78" | 0" |
| 1986 | 82°F | 65°F | 0" | 0" |
| 1985 | 79°F | 64°F | 0" | 0" |
| 1984 | 87°F | 63°F | 0" | 0" |
| 1983 | 98°F | 70°F | 0.08" | 0" |
| 1982 | 85°F | 62°F | 0" | 0" |
| 1981 | 86°F | 63°F | 0.1" | 0" |
| 1980 | 98°F | 60°F | 0.89" | 0" |
| 1979 | 85°F | 55°F | 0" | 0" |
| 1978 | 90°F | 70°F | 0.1" | 0" |
| 1977 | 93°F | 72°F | 0" | 0" |
| 1976 | 91°F | 69°F | 2.21" | 0" |
| 1975 | 87°F | 62°F | 0" | 0" |
| 1974 | 83°F | 53°F | 0" | 0" |
| 1973 | 78°F | 67°F | 0" | 0" |
| 1972 | 93°F | 74°F | 0" | 0" |
| 1971 | 83°F | 57°F | 0" | 0" |