Weather on September 30 at Indiana Dunes
Indiana Dunes National Park
Based on 54 years of data from Gary, IN
Planning Your Visit
September 30th in Indiana Dunes National Park (via Gary, IN) typically brings pleasant fall weather, with average highs around 72°F and lows near 49°F. Over 54 years of records, the warmest September 30th was in 2019 (78°F average), while the coldest was 1984 (46°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 20% of September 30th dates historically, with the wettest September 30th recording 2.11" of rain. The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
Planning for September 30th in Indiana Dunes? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 84°F | 59°F | 0" | 0" |
| 2024 | 75°F | 60°F | -- | 0" |
| 2023 | 72°F | 57°F | 0" | 0" |
| 2022 | 63°F | 43°F | 0" | 0" |
| 2021 | 81°F | 57°F | 0" | 0" |
| 2020 | 60°F | 47°F | 0" | 0" |
| 2019 | 87°F | 68°F | -- | -- |
| 2018 | 74°F | 51°F | -- | -- |
| 2017 | 67°F | 42°F | 0" | 0" |
| 2016 | 66°F | 59°F | 0.25" | 0" |
| 2015 | 67°F | 48°F | 0.03" | 0" |
| 2014 | 80°F | 52°F | 0" | 0" |
| 2013 | 64°F | 46°F | 0" | 0" |
| 2012 | 71°F | 45°F | 0" | 0" |
| 2011 | 67°F | 50°F | 0.64" | 0" |
| 2010 | 76°F | 50°F | 0" | 0" |
| 2009 | 55°F | 50°F | 0.03" | 0" |
| 2008 | 69°F | 57°F | 0.3" | 0" |
| 2007 | 83°F | 57°F | -- | -- |
| 2006 | 60°F | 45°F | 0.13" | 0" |
| 2005 | 58°F | 41°F | 0" | 0" |
| 2004 | 61°F | 40°F | 0" | 0" |
| 2003 | 57°F | 41°F | 0" | 0" |
| 2002 | 82°F | 62°F | 0" | 0" |
| 2001 | 62°F | 42°F | 0" | 0" |
| 2000 | 74°F | 52°F | 0" | 0" |
| 1999 | 69°F | 40°F | 0" | 0" |
| 1998 | 77°F | 53°F | 2.11" | 0" |
| 1997 | 77°F | 49°F | 0" | 0" |
| 1996 | 77°F | 50°F | 0" | 0" |
| 1994 | 63°F | 43°F | 0" | 0" |
| 1993 | 60°F | 32°F | 0" | 0" |
| 1992 | 66°F | 37°F | 0" | 0" |
| 1991 | 82°F | 53°F | 0" | 0" |
| 1990 | 60°F | 50°F | 0" | 0" |
| 1989 | 78°F | 42°F | 0" | 0" |
| 1988 | 80°F | 60°F | 0" | 0" |
| 1987 | 64°F | 44°F | 0" | 0" |
| 1986 | 75°F | 65°F | 2.11" | 0" |
| 1985 | 76°F | 47°F | 0.89" | 0" |
| 1984 | 59°F | 34°F | 0" | 0" |
| 1983 | 80°F | 50°F | 0" | 0" |
| 1982 | 85°F | 54°F | 0" | 0" |
| 1981 | 85°F | 52°F | 0" | 0" |
| 1980 | 84°F | 37°F | 0" | 0" |
| 1979 | 82°F | 60°F | 0" | 0" |
| 1978 | 75°F | 59°F | 0.46" | 0" |
| 1977 | 75°F | 55°F | 0" | 0" |
| 1976 | 75°F | 46°F | 0" | 0" |
| 1975 | 75°F | 45°F | 0.28" | 0" |
| 1974 | 61°F | 36°F | 0" | 0" |
| 1973 | 72°F | 57°F | 0" | 0" |
| 1972 | 57°F | 38°F | 0" | 0" |
| 1971 | 91°F | 60°F | 0" | 0" |