Updated October 2026
Indiana Dunes National Park Weather by Month
Indiana Dunes National Park is warmest in July, when the nearest NOAA climate station averages a high of 82°F and a low of 64°F, and coldest in January, with an average high of 32°F and an average low of 18°F. May and June are the wettest months, with about 4.3 inches of precipitation each. Snowfall is heaviest in January, at about 16 inches.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 0.6 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Indiana Dunes National Park can differ from these, particularly with elevation.
Warmest month
Jul
82°F avg high
Coldest month
Jan
18°F avg low
Snowiest month
Jan
16.0 in avg
Longest days
Jun
15.0 h of daylight
Average weather at Indiana Dunes by month
| Month | Avg high | Avg low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 32°F | 18°F | 2.2 in | 16.0 in | 9.3 h |
| February | 36°F | 21°F | 2.0 in | 9.7 in | 10.4 h |
| March | 46°F | 30°F | 2.3 in | 6.0 in | 11.7 h |
| April | 57°F | 40°F | 3.6 in | 0.6 in | 13.1 h |
| May | 68°F | 50°F | 4.3 in | 0.0 in | 14.3 h |
| June | 78°F | 60°F | 4.3 in | 0.0 in | 15.0 h |
| July | 82°F | 64°F | 4.0 in | 0.0 in | 14.7 h |
| August | 80°F | 63°F | 4.1 in | 0.0 in | 13.7 h |
| September | 74°F | 56°F | 3.7 in | 0.0 in | 12.3 h |
| October | 62°F | 45°F | 3.8 in | 0.0 in | 10.8 h |
| November | 49°F | 34°F | 2.8 in | 0.7 in | 9.6 h |
| December | 37°F | 24°F | 2.3 in | 7.3 in | 9.0 h |
| Year total | 39.4 in | 40.3 in |
NOAA 1991–2020 climate normals from station USC00124244, 0.6 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Indiana Dunes is at that time of year.
Indiana Dunes weather by season
Winter: December to February
Average highs bottom out at 32°F in January, between 37°F in December and 36°F in February, with average lows between 18°F and 24°F. The average low is at or below freezing in all three months. Together the three months average 6.5 inches of precipitation, about 16% of the yearly total and less than in any other season. Snowfall averages about 33 inches for the season. Daylight is at its shortest, about 9.0 hours in December.
Spring: March to May
Average highs climb from 46°F in March to 68°F in May, with average lows between 30°F and 50°F. The average low is at or below freezing in March. Together the three months average 10.2 inches of precipitation, about 26% of the yearly total. Snowfall averages about 6.6 inches for the season, most of it in March. Daylight lengthens from about 11.7 hours in March to 14.3 in May.
Summer: June to August
Average highs peak at 82°F in July, between 78°F in June and 80°F in August, with average lows between 60°F and 64°F. Together the three months average 12.4 inches of precipitation, about 31% of the yearly total and more than in any other season. Daylight is at its longest, about 15.0 hours in June.
Fall: September to November
Average highs fall from 74°F in September to 49°F in November, with average lows between 34°F and 56°F. Together the three months average 10.3 inches of precipitation, about 26% of the yearly total. Snowfall averages about 0.7 inches for the season. Daylight shortens from about 12.3 hours in September to 9.6 in November.
What the National Park Service says about the weather
On average, the warmest month is July and the highest recorded temperature was 105F in 1934. The coolest month is January, with the lowest recorded temperature of -25F in 1985. June sees the most precipitation with an average rainfall of 4.66 Inches.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Indiana Dunes
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 41.64°N, 87.10°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for Indiana Dunes National Park →
Weather and crowds together
July is both the warmest month and the busiest, with about 2.2× the visitors of the park's average month. January is the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Indiana Dunes National Park. For hotels, cabins and rentals close to the park, see where to stay near Indiana Dunes.
Where to stay near Indiana Dunes
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Top-rated places to stay near Indiana Dunes
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Frequently Asked Questions
July is the warmest month at Indiana Dunes National Park, with an average high of 82°F and an average low of 64°F. That is the 1991–2020 average at the nearest long-record NOAA station, 0.6 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Indiana Dunes National Park, with an average low of 18°F and an average high of 32°F, based on NOAA 1991–2020 climate normals.
May and June are the wettest months, with about 4.3 inches of precipitation each. February is the driest, at about 2 inches. The station records about 39.4 inches of precipitation in an average year.
Yes. The nearest long-record NOAA station, 0.6 miles from the park's reference point, averages about 40 inches of snow a year. January is the snowiest month, at about 16 inches. The station averages at least a tenth of an inch of snow in 6 of the 12 months.
Weather at nearby parks
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00124244), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1979–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.