Weather on September 11 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
September 11th in Indiana Dunes National Park (via Gary, IN) typically brings pleasant fall weather, with average highs around 79°F and lows near 58°F. Over 55 years of records, the warmest September 11th was in 2013 (85°F average), while the coldest was 1995 (54°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 29% of September 11th dates historically, with the wettest September 11th recording 7.54" of rain. The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
Planning for September 11th in Indiana Dunes? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 84°F | 55°F | 0" | 0" |
| 2024 | 81°F | 52°F | 0" | 0" |
| 2023 | 75°F | 58°F | 0.51" | 0" |
| 2022 | 84°F | 63°F | -- | 0" |
| 2021 | 85°F | 63°F | -- | -- |
| 2020 | 65°F | 58°F | 0.03" | 0" |
| 2019 | 90°F | 70°F | 0" | 0" |
| 2018 | 67°F | 52°F | 0" | -- |
| 2017 | 72°F | 51°F | 0" | 0" |
| 2016 | 72°F | 56°F | 0.03" | 0" |
| 2015 | 74°F | 58°F | 0.69" | 0" |
| 2014 | 78°F | 53°F | 0.69" | 0" |
| 2013 | 96°F | 73°F | 0" | 0" |
| 2012 | 76°F | 50°F | 0" | 0" |
| 2011 | 73°F | 56°F | 0" | 0" |
| 2010 | 77°F | 56°F | 0.99" | 0" |
| 2009 | 82°F | 62°F | 0" | 0" |
| 2008 | 72°F | 54°F | 0" | 0" |
| 2007 | 71°F | 55°F | 0.84" | 0" |
| 2006 | 60°F | 58°F | 0.18" | 0" |
| 2005 | 90°F | 68°F | 0" | 0" |
| 2004 | 77°F | 57°F | 0" | 0" |
| 2003 | 83°F | 65°F | 0" | 0" |
| 2002 | 88°F | 62°F | 0.1" | 0" |
| 2001 | 78°F | 53°F | 0" | 0" |
| 2000 | 78°F | 72°F | 7.54" | 0" |
| 1999 | 75°F | 47°F | 0" | 0" |
| 1998 | 84°F | 56°F | 0" | 0" |
| 1997 | 70°F | 47°F | 0" | 0" |
| 1996 | 82°F | 51°F | 0.53" | 0" |
| 1995 | 65°F | 44°F | -- | 0" |
| 1994 | 86°F | 55°F | 0" | 0" |
| 1993 | 68°F | 51°F | 0" | 0" |
| 1992 | 68°F | 47°F | 0" | 0" |
| 1991 | 74°F | 58°F | 0" | 0" |
| 1990 | 84°F | 64°F | 0" | 0" |
| 1989 | 83°F | 58°F | -- | 0" |
| 1988 | 85°F | 54°F | 0" | 0" |
| 1987 | 82°F | 59°F | 0" | 0" |
| 1986 | 87°F | 69°F | 1.17" | 0" |
| 1985 | 70°F | 52°F | 0" | 0" |
| 1984 | 74°F | 64°F | 0" | 0" |
| 1983 | 95°F | 63°F | 0.86" | 0" |
| 1982 | 88°F | 65°F | 0" | 0" |
| 1981 | 87°F | 63°F | 0" | 0" |
| 1980 | 77°F | 50°F | 0" | 0" |
| 1979 | 86°F | 59°F | 0" | 0" |
| 1978 | 92°F | 67°F | 0" | 0" |
| 1977 | 80°F | 48°F | 0" | 0" |
| 1976 | 83°F | 49°F | 0" | 0" |
| 1975 | 84°F | 67°F | 0.18" | 0" |
| 1974 | 86°F | 69°F | 0.48" | 0" |
| 1973 | 78°F | 60°F | 0" | 0" |
| 1972 | 78°F | 57°F | 0.28" | 0" |
| 1971 | 86°F | 61°F | 0" | 0" |