Isle Royale National Park weather in April
April in Isle Royale National Park: freezing, rainy, with clean air — a good time to visit.
#7 of 12 months in Isle Royale National Park · #527 of 604 destinations to visit in April · comfort 64/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Isle Royale National Park climate normals — April
| Daytime high | 2°C / 36°F | 🥶 freezing |
|---|---|---|
| Nighttime low | -1°C / 31°F | |
| Feels like (high) | -3°C / 27°F | |
| Rainfall | 91 mm / 3.6 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | -3°C / 27°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 13.7 h | |
| Wind | 34 km/h / 21 mph | |
| Snowfall | 24.3 cm / 9.6 in | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Isle Royale National Park?
Loading map…
Isle Royale National Park in April — FAQ
- Is April a good time to visit Isle Royale National Park?
- April in Isle Royale National Park: freezing, rainy, with clean air — a good time to visit. It ranks #7 of 12 months for Isle Royale National Park on SeasonMap's comfort score (64/100).
- What is the weather like in Isle Royale National Park in April?
- In April, Isle Royale National Park averages a daily high of 2.1°C and a low of -0.7°C, with about 90.7 mm of rain over roughly 11 rainy days.
- What is the air quality in Isle Royale National Park in April?
- Isle Royale National Park has a mean US Air Quality Index of about 41 in April.
- Does it snow in Isle Royale National Park in April?
- Isle Royale National Park sees roughly 24.3 cm of snowfall in April.