Weather on July 18 at Indiana Dunes
Indiana Dunes National Park
Based on 54 years of data from Gary, IN
Planning Your Visit
July 18th in Indiana Dunes National Park (via Gary, IN) typically brings warm summer weather, with average highs around 85°F and lows near 65°F. Over 54 years of records, the warmest July 18th was in 2011 (85°F average), while the coldest was 2017 (63°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 33% of July 18th dates historically, with the wettest July 18th recording 10.67" of rain. The last decade has been 4.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.6°F cooler on this date compared to 20-30 years ago.
Planning for July 18th 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 | 74°F | 61°F | 0" | 0" |
| 2024 | 77°F | 64°F | 0" | 0" |
| 2023 | 76°F | 54°F | 0" | 0" |
| 2022 | 76°F | 67°F | -- | 0" |
| 2021 | 81°F | 65°F | -- | -- |
| 2020 | 90°F | 70°F | -- | -- |
| 2019 | 86°F | 72°F | 0" | 0" |
| 2018 | 78°F | 56°F | 0" | -- |
| 2017 | 72°F | 55°F | 0" | 0" |
| 2016 | 83°F | 67°F | 1.02" | 0" |
| 2015 | 92°F | 70°F | 0.99" | 0" |
| 2014 | 74°F | 54°F | 0" | 0" |
| 2013 | 90°F | 72°F | 0" | 0" |
| 2012 | 96°F | 74°F | 0" | 0" |
| 2011 | 92°F | 79°F | 0" | 0" |
| 2010 | 88°F | 71°F | 0" | 0" |
| 2009 | 70°F | 61°F | 0.08" | 0" |
| 2008 | 89°F | 70°F | 0" | 0" |
| 2007 | 82°F | 67°F | 0.23" | 0" |
| 2006 | 92°F | 69°F | 0.43" | 0" |
| 2005 | 94°F | 70°F | 0.03" | 0" |
| 2004 | 73°F | 61°F | 0" | 0" |
| 2003 | 83°F | 67°F | 3.3" | 0" |
| 2002 | 90°F | 69°F | 0" | 0" |
| 2001 | 85°F | 69°F | 0.05" | 0" |
| 2000 | 85°F | 62°F | 0" | 0" |
| 1999 | 86°F | 65°F | 0" | 0" |
| 1998 | 86°F | 68°F | 3.81" | 0" |
| 1997 | 91°F | 63°F | 1.98" | 0" |
| 1996 | 84°F | 67°F | 10.67" | 0" |
| 1995 | 83°F | 60°F | -- | 0" |
| 1994 | 81°F | 59°F | 0" | 0" |
| 1993 | 88°F | 70°F | 0.64" | 0" |
| 1992 | 81°F | 62°F | 0.13" | 0" |
| 1991 | 93°F | 70°F | 0" | 0" |
| 1990 | 88°F | 67°F | 0" | 0" |
| 1989 | 84°F | 63°F | 0" | 0" |
| 1988 | 79°F | 69°F | 1.3" | 0" |
| 1987 | 90°F | 67°F | 0" | 0" |
| 1986 | 94°F | 75°F | 0" | 0" |
| 1985 | 87°F | 57°F | 0" | 0" |
| 1983 | 91°F | 70°F | 0.05" | 0" |
| 1982 | 91°F | 69°F | 0.43" | 0" |
| 1981 | 90°F | 63°F | 0" | 0" |
| 1980 | 90°F | 63°F | 0" | 0" |
| 1979 | 74°F | 60°F | 0" | 0" |
| 1978 | 87°F | 68°F | 0" | 0" |
| 1977 | 91°F | 70°F | 0" | 0" |
| 1976 | 88°F | 57°F | 0" | 0" |
| 1975 | 91°F | 64°F | 4.19" | 0" |
| 1974 | 90°F | 68°F | 0" | 0" |
| 1973 | 86°F | 61°F | 0" | 0" |
| 1972 | 85°F | 67°F | 4.14" | 0" |
| 1971 | 80°F | 50°F | 0" | 0" |