Weather on September 23 at Indiana Dunes
Indiana Dunes National Park
Based on 55 years of data from Gary, IN
Planning Your Visit
September 23rd in Indiana Dunes National Park (via Gary, IN) typically brings pleasant fall weather, with average highs around 72°F and lows near 50°F. Over 55 years of records, the warmest September 23rd was in 2017 (80°F average), while the coldest was 1974 (46°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 35% of September 23rd dates historically, with the wettest September 23rd recording 3.73" of rain. The last decade has been 5.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.7°F warmer on this date compared to 20-30 years ago.
Planning for September 23rd 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 | 84°F | 65°F | 0" | 0" |
| 2024 | 69°F | 61°F | 3.68" | 0" |
| 2023 | 79°F | 59°F | 0" | 0" |
| 2022 | 63°F | 43°F | 0" | 0" |
| 2021 | -- | 50°F | 0.84" | 0" |
| 2020 | 78°F | 52°F | 0" | 0" |
| 2019 | 74°F | 55°F | -- | -- |
| 2018 | 73°F | 49°F | -- | -- |
| 2017 | 93°F | 67°F | 0" | 0" |
| 2016 | 82°F | 65°F | 0.05" | 0" |
| 2015 | 78°F | 54°F | 0" | 0" |
| 2014 | 62°F | 43°F | 0" | 0" |
| 2013 | 62°F | 44°F | 0" | 0" |
| 2012 | 56°F | 46°F | 0.05" | 0" |
| 2011 | 64°F | 45°F | 0" | 0" |
| 2010 | 70°F | 65°F | 0" | 0" |
| 2009 | 78°F | 62°F | 0.48" | 0" |
| 2008 | 82°F | 59°F | 0" | 0" |
| 2007 | 69°F | 51°F | 0" | 0" |
| 2006 | 68°F | 57°F | 0.08" | 0" |
| 2005 | 91°F | 59°F | 0" | 0" |
| 2004 | 79°F | 56°F | 0" | 0" |
| 2003 | 67°F | 52°F | 0.3" | 0" |
| 2002 | 63°F | 42°F | 0.23" | 0" |
| 2001 | 74°F | 58°F | 0" | 0" |
| 2000 | 71°F | 51°F | 0.53" | 0" |
| 1999 | 72°F | 47°F | 0" | 0" |
| 1998 | 69°F | 46°F | 0.18" | 0" |
| 1997 | 70°F | 42°F | 0.53" | 0" |
| 1996 | 74°F | 48°F | 0" | 0" |
| 1995 | 59°F | 35°F | -- | 0" |
| 1994 | 82°F | 60°F | 0" | 0" |
| 1993 | 67°F | 54°F | 0.15" | 0" |
| 1992 | 57°F | 37°F | 0" | 0" |
| 1991 | 63°F | 43°F | 0" | 0" |
| 1990 | 66°F | 40°F | 0" | 0" |
| 1989 | 75°F | 44°F | 0.36" | 0" |
| 1988 | 87°F | 60°F | 0.15" | 0" |
| 1987 | 75°F | 48°F | 0" | 0" |
| 1986 | 89°F | 59°F | 3.73" | 0" |
| 1985 | 77°F | 54°F | 1.32" | 0" |
| 1984 | 78°F | 63°F | 2.31" | 0" |
| 1983 | 59°F | 39°F | 0" | 0" |
| 1982 | 71°F | 41°F | 0" | 0" |
| 1981 | 65°F | 36°F | 0" | 0" |
| 1980 | 65°F | 51°F | 0.51" | 0" |
| 1979 | 71°F | 35°F | 0" | 0" |
| 1978 | 80°F | 47°F | 0" | 0" |
| 1977 | 82°F | 53°F | 0" | 0" |
| 1976 | 68°F | 51°F | 0" | 0" |
| 1975 | 69°F | 41°F | 0" | 0" |
| 1974 | 61°F | 31°F | 0" | 0" |
| 1973 | 78°F | 52°F | 0" | 0" |
| 1972 | 60°F | 47°F | 0.91" | 0" |
| 1971 | 72°F | 53°F | 0" | 0" |