Indiana Dunes National Park weather in May
May in Indiana Dunes National Park: nice, rainy — one of the best months to visit.
#1 of 12 months in Indiana Dunes National Park · #197 of 604 destinations to visit in May · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Indiana Dunes National Park climate normals — May
| Daytime high | 17°C / 62°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 52°F | |
| Feels like (high) | 16°C / 61°F | |
| Rainfall | 142 mm / 5.6 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 75% | 💧 humid |
| Dew point | 10°C / 49°F | |
| Sunshine | 10.1 h/day | |
| Daylight | 14.5 h | |
| Wind | 20 km/h / 12 mph | |
| Snowfall | 0.8 cm / 0.3 in | |
| Air quality (US AQI) | 51 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Indiana Dunes National Park in May — FAQ
- Is May a good time to visit Indiana Dunes National Park?
- May in Indiana Dunes National Park: nice, rainy — one of the best months to visit. It ranks #1 of 12 months for Indiana Dunes National Park on SeasonMap's comfort score (85/100).
- What is the weather like in Indiana Dunes National Park in May?
- In May, Indiana Dunes National Park averages a daily high of 16.8°C and a low of 11°C, with about 141.9 mm of rain over roughly 14.2 rainy days.
- What is the air quality in Indiana Dunes National Park in May?
- Indiana Dunes National Park has a mean US Air Quality Index of about 51 in May.