Weather on May 20 at Indiana Dunes
Indiana Dunes National Park
INMidwest600 ft elevation
Avg High71°F
Avg Low50°F
Warmest197579°F
Coldest201544°F
Based on 55 years of data from Gary, IN
Planning Your Visit
May 20th in Indiana Dunes National Park (via Gary, IN) typically brings pleasant spring weather, with average highs around 71°F and lows near 50°F. Over 55 years of records, the warmest May 20th was in 1975 (79°F average), while the coldest was 2015 (44°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 27% of May 20th dates historically, with the wettest May 20th recording 2.84" of rain. The last decade has been 4.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.0°F cooler on this date compared to 20-30 years ago.
Planning for May 20th in Indiana Dunes? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 61°F | 45°F | 0.48" | 0" |
| 2024 | 72°F | 56°F | 0" | 0" |
| 2023 | 69°F | 45°F | 0.08" | 0" |
| 2022 | 83°F | 58°F | 0" | 0" |
| 2021 | 74°F | 64°F | 0.53" | 0" |
| 2020 | 62°F | 54°F | 0.03" | 0" |
| 2019 | 57°F | 42°F | -- | -- |
| 2018 | 55°F | 45°F | -- | -- |
| 2017 | 54°F | 45°F | 0.46" | 0" |
| 2016 | 64°F | 50°F | 0" | 0" |
| 2015 | 50°F | 38°F | 0" | 0" |
| 2014 | 68°F | 60°F | 0" | 0" |
| 2013 | 86°F | 69°F | 0" | 0" |
| 2012 | 89°F | 66°F | 0" | 0" |
| 2011 | 60°F | 45°F | 0.03" | 0" |
| 2010 | 66°F | 47°F | 0" | 0" |
| 2009 | 78°F | 57°F | 0" | 0" |
| 2008 | 59°F | 44°F | 0" | 0" |
| 2007 | 79°F | 48°F | 0" | 0" |
| 2006 | 56°F | 37°F | 0" | 0" |
| 2005 | 68°F | 51°F | 0.41" | 0" |
| 2004 | 73°F | 56°F | 0" | 0" |
| 2003 | 67°F | 46°F | -- | -- |
| 2002 | 53°F | 41°F | 0" | 0" |
| 2001 | 77°F | 68°F | 0" | 0" |
| 2000 | 50°F | 46°F | 0.03" | 0" |
| 1999 | 80°F | 62°F | 0" | 0" |
| 1998 | 86°F | 59°F | 0" | 0" |
| 1997 | 79°F | 37°F | -- | 0" |
| 1996 | 83°F | 51°F | 2.74" | 0" |
| 1995 | 76°F | 46°F | -- | 0" |
| 1994 | 64°F | 40°F | 0" | 0" |
| 1993 | 62°F | 39°F | 0" | 0" |
| 1992 | 82°F | 52°F | 0" | 0" |
| 1991 | 71°F | 47°F | 0" | 0" |
| 1990 | 70°F | 49°F | 0" | 0" |
| 1989 | 74°F | 60°F | 0.58" | 0" |
| 1988 | 75°F | 47°F | 0" | 0" |
| 1987 | 85°F | 53°F | 0.13" | 0" |
| 1986 | 50°F | 43°F | 0.03" | 0" |
| 1985 | 84°F | 48°F | 1.14" | 0" |
| 1984 | 71°F | 55°F | 2.84" | 0" |
| 1983 | 69°F | 53°F | 0" | 0" |
| 1982 | 74°F | 49°F | 0" | 0" |
| 1981 | 73°F | 36°F | 0" | 0" |
| 1980 | 63°F | 39°F | 0" | 0" |
| 1979 | 68°F | 45°F | 0" | 0" |
| 1978 | 87°F | 62°F | 0.18" | 0" |
| 1977 | 91°F | 60°F | 0" | 0" |
| 1976 | 85°F | 57°F | 0" | 0" |
| 1975 | 92°F | 66°F | 0" | 0" |
| 1974 | 80°F | 52°F | 0" | 0" |
| 1973 | 67°F | 40°F | 0" | 0" |
| 1972 | 84°F | 50°F | 0" | 0" |
| 1971 | 71°F | 47°F | 0" | 0" |
May 20 at Nearby Parks
Holiday Weather at Indiana Dunes
Official NPS WebsiteVisit nps.gov/indu for park information, alerts, and reservations
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