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Weather by month

Indiana Dunes weather, month by month

Last verified NOAA 1991–2020 normalsAmerica/Chicago time
Average highs, lows, rain, snow and daylight for every month. Measured at the Indiana Dunes NL (680 ft, 0.6 mi from Indiana Dunes (NPS reference point)).
Jul high
82°F
hottest month
Jan low
18°F
coldest month
Rain + snowmelt
39.2in / yr
wettest: Jun
Snowfall
40.3in / yr
Dec–Mar
Days ≥ 90°F
11/ yr
Nights ≤ 32°F
117/ yr

Indiana Dunes NL

Month by month

Normals are 30-year averages (1991–2020). Crowds = each month’s share of the park’s busiest month, from NPS visitor counts. Sunrise and sunset are for the 15th of each month in 2027.
Average high and low, every monthbars run from the low to the high · tan strip = precipitation
comfortable highs 55–85°F20°40°60°80°32°January: average high 32°F, low 18°F, 2.2 in precipitation32°18°January: 2.2 in precipitationJFebruary: average high 36°F, low 21°F, 2.0 in precipitation36°21°February: 2.0 in precipitationFMarch: average high 46°F, low 30°F, 2.3 in precipitation46°30°March: 2.3 in precipitationMApril: average high 57°F, low 40°F, 3.5 in precipitation57°40°April: 3.5 in precipitationAMay: average high 68°F, low 50°F, 4.3 in precipitation68°50°May: 4.3 in precipitationMJune: average high 78°F, low 60°F, 4.3 in precipitation78°60°June: 4.3 in precipitationJJuly: average high 82°F, low 64°F, 4.0 in precipitation82°64°July: 4.0 in precipitationJAugust: average high 80°F, low 63°F, 4.1 in precipitation80°63°August: 4.1 in precipitationASeptember: average high 74°F, low 56°F, 3.6 in precipitation74°56°September: 3.6 in precipitationSOctober: average high 62°F, low 45°F, 3.8 in precipitation62°45°October: 3.8 in precipitationONovember: average high 49°F, low 34°F, 2.8 in precipitation49°34°November: 2.8 in precipitationNDecember: average high 37°F, low 24°F, 2.3 in precipitation37°24°December: 2.3 in precipitationDrain
MonthHighLowRainSnowWet daysSunriseSunsetDaylightCrowds
Jan32°18°2.2″16.0″137:13 AM4:42 PM9h 30m15
Feb36°21°2.0″9.7″96:44 AM5:21 PM10h 37m16
Mar46°30°2.3″6.0″117:00 AM6:54 PM11h 54m26
Apr57°40°3.5″0.6″116:09 AM7:28 PM13h 20m33
May68°50°4.3″—125:29 AM8:01 PM14h 32m57
Jun78°60°4.3″—125:13 AM8:24 PM15h 11m86
Jul82°64°4.0″—105:27 AM8:22 PM14h 54m100
Aug80°63°4.1″—105:57 AM7:49 PM13h 52m83
Sep74°56°3.6″—106:29 AM6:59 PM12h 30m53
Oct62°45°3.8″—127:00 AM6:08 PM11h 08m42
Nov49°34°2.8″0.7″116:37 AM4:29 PM9h 51m23
Dec37°24°2.3″7.3″127:08 AM4:19 PM9h 11m20

Sweet spot: April, May, September and October combine average highs between 55°F and 85°F with crowds under 60% of the peak month. Check what is open in those months — quiet can also mean closed roads.

How to read this

These are NOAA’s official 1991–2020 climate normals for one weather station, not a model of the whole park. The station is the one with complete temperature and precipitation normals nearest to a visitor center. Highs and lows are daily averages for the month; “wet days” are days with at least 0.01 inch of precipitation. Mountain parks can be 10–20 °F cooler at their high points than at the station, and the NPS weather page for Indiana Dunes is the place for current conditions and seasonal closures.

Sunrise and sunset are computed with the NOAA solar equations for the park’s coordinates and shown in America/Chicago time for the 15th of each month of 2027; they are accurate to about a minute.

Sources · 3

  1. 1.U.S. Climate Normals 1991–2020 — monthly normals station inventory · National Centers for Environmental Information (NOAA)
  2. 2.Indiana Dunes National Park — Weather (nps.gov) · National Park Service
  3. 3.Indiana Dunes National Park — Visitor Use Statistics · National Park Service (IRMA)

FAQ

Indiana Dunes weather questions

What is the hottest month at Indiana Dunes?
July, with an average high of 82°F and an average low of 64°F at Indiana Dunes NL (NOAA 1991–2020 normals). The station averages 11 days a year at or above 90°F.
How cold does Indiana Dunes get in winter?
January is the coldest month, averaging a low of 18°F and a high of 32°F at Indiana Dunes NL. About 117 nights a year drop to freezing or below.
Does it snow at Indiana Dunes?
Yes. Indiana Dunes NL averages 40.3 inches of snow a year, mostly in January, February, March and December. Higher ground in the park gets more.
When is the rainy season at Indiana Dunes?
June is the wettest month on average (4.3 inches of precipitation at Indiana Dunes NL); the station's annual total is 39.2 inches.
How many hours of daylight does Indiana Dunes get?
About 15h 11m on June 15 and 9h 11m on December 15 (sunrise 5:13 AM, sunset 8:24 PM in June; 7:08 AM to 4:19 PM in December, America/Chicago time).
What is the best month to visit Indiana Dunes for weather?
By NOAA's normals, average highs sit between 55°F and 85°F in April, May, June, July, August, September and October. Of those, April, May, September and October are also well below the park's peak crowds. Weather in the park varies with elevation; this is the Indiana Dunes NL station.

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