Isle Royale National Park weather in July
July in Isle Royale National Park: cool, a little rain, with clean air — one of the best months to visit.
#1 of 12 months in Isle Royale National Park · #99 of 604 destinations to visit in July · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Isle Royale National Park climate normals — July
| Daytime high | 14°C / 56°F | 🙂 cool |
|---|---|---|
| Nighttime low | 10°C / 49°F | |
| Feels like (high) | 12°C / 54°F | |
| Rainfall | 64 mm / 2.5 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 93% | 💦 very humid |
| Dew point | 8°C / 46°F | |
| Sunshine | 12.5 h/day | |
| Daylight | 15.6 h | |
| Wind | 26 km/h / 16 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Isle Royale National Park?
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Isle Royale National Park in July — FAQ
- Is July a good time to visit Isle Royale National Park?
- July in Isle Royale National Park: cool, a little rain, with clean air — one of the best months to visit. It ranks #1 of 12 months for Isle Royale National Park on SeasonMap's comfort score (89/100).
- What is the weather like in Isle Royale National Park in July?
- In July, Isle Royale National Park averages a daily high of 13.6°C and a low of 9.7°C, with about 64.3 mm of rain over roughly 7.4 rainy days.
- What is the air quality in Isle Royale National Park in July?
- Isle Royale National Park has a mean US Air Quality Index of about 36 in July.