Indiana Dunes in May: Crowds, Weather & What to Pack
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May is one of the best months of the year to visit Indiana Dunes National Park: crowds run 57% of the July peak (291,748 average visits), days average 68°F with 14.5 hours of daylight. Computed from NPS and NOAA data.
Crowds in May
Indiana Dunes averages 291,748 recreation visits in May — 57% of what July, the peak month, draws. Trailheads and parking fill accordingly.
Weather & daylight
Days are mild (highs average 68°F), and nights stay mild (lows average 50°F). This is one of the wetter months (4.3″ of precipitation on average). Mid-month daylight runs 14.5 hours.
NOAA 1991–2020 monthly normals, station INDIANA DUNES NL, IN US (1 mi from park coordinates, 680 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of May.
What to pack for Indiana Dunes in May
Computed from the month's weather normals above — not a generic list.
- Rain shell + pack cover — 4.3″ of precipitation is normal this month
- Sturdy broken-in footwear, navigation and a basic first-aid kit — every park, every month
Common questions
Is Indiana Dunes crowded in May?
Moderately: May runs 57% of the July peak, averaging 291,748 visits (NPS, 2021–2025).
What is the weather like in Indiana Dunes in May?
Average highs of 68°F, lows of 50°F, 4.3″ of precipitation (NOAA 1991–2020 normals, INDIANA DUNES NL, IN US station).
What should I pack for Indiana Dunes in May?
Rain shell + pack cover; Sturdy broken-in footwear, navigation and a basic first-aid kit — the full weather-computed list is on this page.
See also: the best national parks to visit in May · Last verified 2026-07-16