Water temperature in Isle Royale (MI) in July
Is it warm enough to swim in Isle Royale in July? Average water temperature in Isle Royale in July is 48.4°F and therefore is not suitable for comfortable swimming. The warmest water in Isle Royale in July is 66.7°F, and the coldest is 38.1°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Isle Royale
Changes water temperature in Isle Royale in July 2025, 2024
To get an accurate forecast for the water temperature in Isle Royale for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Isle Royale, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of July.
You can choose any other years:
| Day |
2025 |
2024 |
Min |
Max |
| July 1 | 40.5°F | 45.1°F | 38.8°F | 50.2°F |
| July 2 | 40.3°F | 45.9°F | 39°F | 50.9°F |
| July 3 | 40.1°F | 46.8°F | 38.5°F | 53.8°F |
| July 4 | 39.4°F | 46.6°F | 38.1°F | 53.6°F |
| July 5 | 39.6°F | 46.4°F | 39°F | 56.5°F |
| July 6 | 38.7°F | 50.7°F | 38.7°F | 55.6°F |
| July 7 | 38.8°F | 51.3°F | 38.8°F | 58.6°F |
| July 8 | 39.7°F | 52.5°F | 38.7°F | 58.3°F |
| July 9 | 40.5°F | 53.6°F | 38.7°F | 58.1°F |
| July 10 | 41.9°F | 55°F | 39.4°F | 58.8°F |
| July 11 | 40.8°F | 54.5°F | 39.6°F | 60.1°F |
| July 12 | 42.3°F | 57.6°F | 40.1°F | 61°F |
| July 13 | 43.7°F | 59°F | 40.5°F | 61.7°F |
| July 14 | 42.8°F | 60.1°F | 39.4°F | 61.7°F |
| July 15 | 43.2°F | 59.5°F | 40.1°F | 62.2°F |
| Day |
2025 |
2024 |
Min |
Max |
| July 16 | 40.3°F | 59.9°F | 40.3°F | 63°F |
| July 17 | 40.8°F | 59.4°F | 40.8°F | 63.9°F |
| July 18 | 42.8°F | 57.4°F | 41.2°F | 62.8°F |
| July 19 | 41°F | 56.7°F | 41°F | 63.7°F |
| July 20 | 42.8°F | 57.7°F | 41.4°F | 63.7°F |
| July 21 | 42.6°F | 57.6°F | 40.8°F | 65.1°F |
| July 22 | 44.6°F | 59.7°F | 41.2°F | 65.1°F |
| July 23 | 46.2°F | 59.9°F | 41.4°F | 65.7°F |
| July 24 | 45.3°F | 59.4°F | 42.8°F | 66°F |
| July 25 | 46.9°F | 59.9°F | 41.4°F | 66°F |
| July 26 | 52.5°F | 60.4°F | 41°F | 65.3°F |
| July 27 | 53.2°F | 60.4°F | 41.5°F | 65.5°F |
| July 28 | 57°F | 64°F | 40.8°F | 65.3°F |
| July 29 | 57°F | 63.3°F | 41.4°F | 65.1°F |
| July 30 | 57.9°F | 63.3°F | 42.8°F | 66.2°F |
| July 31 | 59.2°F | 64°F | 43.3°F | 66.7°F |
Average water temperature in Isle Royale in July over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 54°F | 44.1°F | 45°F | 44.6°F | 50.4°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 56.1°F | 41°F | 44.8°F | 56.3°F | 44.6°F |
Isle Royale water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
