May is an excellent month at Indiana Dunes — it ranks 3rd of the twelve here. Expect about 43% fewer visitors than July, the park's peak — 291,748 visits on average. Days run around 68°F by afternoon and 50°F at night, with 14.5 hours of daylight.
May against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| May (this page) | Excellent | 291,748 | −43% | 68°F | 50°F | 0" | 14.5 h |
| April (best) | Excellent | 166,419 | −67% | 57°F | 40°F | 0.6" | 13.3 h |
| July (peak crowds) | Good | 509,715 | peak | 82°F | 64°F | 0" | 14.9 h |
Weather figures are for the Porter area — the Indiana Dunes Nl station. Visits are 2021–2025 averages; climate normals cover 1991–2020. Conditions vary across the park; check current status before you go.
Common questions
Is May a good time to visit Indiana Dunes?
Yes — it is one of the best months of the year here. May ranks 3 of 12 at Indiana Dunes on crowds, weather, daylight, and access together.
How crowded is Indiana Dunes in May?
About 291,748 recreation visits on average — 43% below July, the park's peak.
How warm is Indiana Dunes in May?
Average highs around 68°F and lows around 50°F at the Indiana Dunes Nl station.
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