Water temperature in Nantucket (MA) in July
Is it warm enough to swim in Nantucket in July? Average water temperature in Nantucket in July is 66.7°F and therefore is not suitable for comfortable swimming. The warmest sea in Nantucket in July is 73.4°F, and the coldest is 60.1°F. Average high air temperature in Nantucket in July is 75°F, and average low temperature is 62°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Nantucket
Changes water temperature in Nantucket in July 2025, 2024
To get an accurate forecast for the water temperature in Nantucket for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Nantucket, 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 | 63.7°F | 68°F | 61.3°F | 68°F |
| July 2 | 62.1°F | 66.9°F | 61.3°F | 66.9°F |
| July 3 | 64.2°F | 66.9°F | 61.9°F | 67.1°F |
| July 4 | 65.1°F | 65.7°F | 61.7°F | 66.6°F |
| July 5 | 64°F | 63.9°F | 61.7°F | 68.2°F |
| July 6 | 64.9°F | 65.7°F | 60.1°F | 69.3°F |
| July 7 | 66.2°F | 64.4°F | 60.6°F | 69.8°F |
| July 8 | 68.2°F | 64.6°F | 60.4°F | 69.3°F |
| July 9 | 66.2°F | 64.6°F | 60.8°F | 69.8°F |
| July 10 | 65.8°F | 67.5°F | 61.2°F | 69.8°F |
| July 11 | 65.3°F | 68.2°F | 61.2°F | 70°F |
| July 12 | 66°F | 67.8°F | 61.7°F | 69.8°F |
| July 13 | 66.6°F | 68.2°F | 63.1°F | 69.6°F |
| July 14 | 67.5°F | 69.6°F | 63.5°F | 69.8°F |
| July 15 | 67.8°F | 70.5°F | 63.3°F | 70.5°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| July 16 | 68°F | 73.4°F | 62.8°F | 73.4°F |
| July 17 | 66.7°F | 72.1°F | 63.3°F | 72.1°F |
| July 18 | 68.4°F | 71.8°F | 64.4°F | 71.8°F |
| July 19 | 68.5°F | 71.1°F | 64.8°F | 71.1°F |
| July 20 | 67.1°F | 70.9°F | 62.8°F | 70.9°F |
| July 21 | 68.2°F | 71.1°F | 61.9°F | 71.4°F |
| July 22 | 67.5°F | 70.2°F | 63.1°F | 71.1°F |
| July 23 | 67.8°F | 68.9°F | 63°F | 71.2°F |
| July 24 | 67.6°F | 68.5°F | 63.5°F | 70.5°F |
| July 25 | 68°F | 68.4°F | 64.4°F | 71.4°F |
| July 26 | 69.3°F | 70.5°F | 65.3°F | 71.1°F |
| July 27 | 67.6°F | 69.4°F | 65.3°F | 71.2°F |
| July 28 | 68.5°F | 68.9°F | 64.9°F | 71.8°F |
| July 29 | 68.5°F | 69.6°F | 65.1°F | 72.7°F |
| July 30 | 70.7°F | 68.7°F | 64°F | 71.8°F |
| July 31 | 69.1°F | 68.2°F | 64.4°F | 71.8°F |
Average water temperature in Nantucket in July over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 67.3°F | 65.3°F | 64.8°F | 67.1°F | 67.5°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 67.6°F | 68.5°F | 67.1°F | 68.5°F | 66.9°F |
Nantucket sea state in July
Chart comparing the height of waves in Nantucket in July over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.
Weather and climate in Nantucket in July
This data display average monthly climate indicators in Nantucket in July based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip
- Average HIGH temperature75°F
- Average LOW temperature62°F
- Average rainfall days7 days
- Average rainfall79mm/3.1''
- Average daylight15h
- Average sunshine8h
- Average UV index8
Nantucket water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
