Weather on September 12 at Indiana Dunes
Indiana Dunes National Park
Based on 54 years of data from Gary, IN
Planning Your Visit
September 12th in Indiana Dunes National Park (via Gary, IN) typically brings pleasant fall weather, with average highs around 78°F and lows near 57°F. Over 54 years of records, the warmest September 12th was in 2005 (80°F average), while the coldest was 1985 (49°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 43% of September 12th dates historically, with the wettest September 12th recording 7.29" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 12th in Indiana Dunes? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 80°F | 58°F | 0" | 0" |
| 2024 | 85°F | 60°F | 0" | 0" |
| 2023 | 64°F | 60°F | 2.18" | 0" |
| 2022 | 71°F | 53°F | -- | 0" |
| 2021 | 88°F | 68°F | -- | -- |
| 2020 | 70°F | 63°F | -- | -- |
| 2019 | 90°F | 66°F | 0.94" | 0" |
| 2018 | 75°F | 55°F | 0" | -- |
| 2017 | 72°F | 48°F | 0" | 0" |
| 2016 | 75°F | 55°F | 0" | 0" |
| 2015 | 66°F | 52°F | 1.98" | 0" |
| 2014 | 58°F | 52°F | 0.05" | 0" |
| 2013 | 93°F | 67°F | 0.64" | 0" |
| 2012 | 80°F | 52°F | 0" | 0" |
| 2011 | 80°F | 59°F | 0" | 0" |
| 2010 | 69°F | 53°F | 0.76" | 0" |
| 2009 | 78°F | 58°F | 0" | 0" |
| 2008 | 78°F | 59°F | 0.15" | 0" |
| 2007 | 72°F | 54°F | 0" | 0" |
| 2006 | 66°F | 59°F | 1.12" | 0" |
| 2005 | 91°F | 68°F | 0" | 0" |
| 2004 | 83°F | 58°F | 0" | 0" |
| 2003 | 82°F | 59°F | 0" | 0" |
| 2002 | 71°F | 51°F | 0" | 0" |
| 2001 | 76°F | 56°F | 0" | 0" |
| 2000 | 88°F | 63°F | 7.29" | 0" |
| 1999 | 85°F | 54°F | 0.46" | 0" |
| 1998 | 89°F | 55°F | 0" | 0" |
| 1997 | 74°F | 48°F | 0" | 0" |
| 1996 | 68°F | 51°F | 1.27" | 0" |
| 1995 | 75°F | 53°F | -- | 0" |
| 1994 | 84°F | 60°F | 0" | 0" |
| 1993 | 74°F | 46°F | 0.84" | 0" |
| 1992 | 71°F | 46°F | 0" | 0" |
| 1991 | 82°F | 58°F | 1.14" | 0" |
| 1990 | 83°F | 64°F | 0" | 0" |
| 1989 | 83°F | 52°F | 0" | 0" |
| 1988 | 86°F | 71°F | 0.03" | 0" |
| 1987 | 82°F | 56°F | 0" | 0" |
| 1986 | 72°F | 57°F | 0.2" | 0" |
| 1985 | 63°F | 36°F | 0" | 0" |
| 1984 | 86°F | 49°F | 0" | 0" |
| 1983 | 76°F | 50°F | 0.05" | 0" |
| 1982 | 88°F | 62°F | 0" | 0" |
| 1981 | 86°F | 62°F | 0" | 0" |
| 1980 | 76°F | -- | 0.84" | 0" |
| 1978 | 89°F | 70°F | 0.23" | 0" |
| 1977 | 92°F | 56°F | 0.28" | 0" |
| 1976 | 83°F | 51°F | 0" | 0" |
| 1975 | 69°F | 53°F | 0.1" | 0" |
| 1974 | 82°F | 69°F | 0.38" | 0" |
| 1973 | 74°F | 47°F | 0" | 0" |
| 1972 | 78°F | 57°F | 0.2" | 0" |
| 1971 | 69°F | 61°F | 0.1" | 0" |