Isle Royale National Park weather by month
The best time to visit Isle Royale National Park, United States is July. Pick a month for full climate normals and a verdict.
- Januaryfreezing, a little rain, clean air40tier F
- Februaryfreezing, a little rain, clean air42tier F
- Marchfreezing, a little rain, clean air56tier D
- Aprilfreezing, rainy, clean air65tier C
- Maycold, a little rain, clean air76tier B
- Junecold, a little rain, clean air81tier A
- Julycool, a little rain, clean air89tier A
- Augustnice, a little rain, clean air87tier A
- Septembercool, rainy, clean air84tier A
- Octobercold, a little rain, clean air73tier B
- Novemberfreezing, a little rain, clean air61tier C
- Decemberfreezing, a little rain, clean air48tier F