Isle Royale National Park in April
In April, Isle Royale National Park averages a high of 45°F and a low of 26°F, with 2.8 inches of precipitation (rain plus melted snow) and 7.7 inches of snowfall. About 68 people visit, the 7th busiest of 12 (few or no visits). Days are 13 hours 34 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 45° / 26°F
- Precipitation
- 2.8in
- Snow
- 7.7in
- Daylight
- 13h 34m
- Visitors
- 68
- Crowds
- Few or no visits
Best months for weather and crowds instead: May (quiet), June (busy) and September (moderate).
Few or no visitors in April: fewer than 3% of the busiest month's visits. Roads, ferries or the whole park may be closed; check Isle Royale National Park on nps.gov before you plan.
Weather 1991–2020 averages at Grand Portage, MN, 41.1 miles from the park's center, 730 ft. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in April
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Voyageurs National Park | 49° / 23° | Few or no visits | Cool |
| Sleeping Bear Dunes National Lakeshore | 50° / 33° | Quiet | Cool |
| Indiana Dunes National Park | 57° / 40° | Moderate | Mild |
| Cuyahoga Valley National Park | 60° / 37° | Busy | Mild, wet |
| Gateway Arch National Park | 68° / 46° | Moderate | Mild, wet |
Closures, reservations and alerts: Isle Royale National Park on nps.gov
All twelve months at Isle Royale · National parks to visit in April