Water temperature in Southwest Harbor in March
Is it warm enough to swim in Southwest Harbor in March? Average water temperature in Southwest Harbor in March is 37.9°F and therefore is not suitable for comfortable swimming. The warmest sea in Southwest Harbor in March is 42.8°F, and the coldest is 34.3°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Southwest Harbor
Changes water temperature in Southwest Harbor in March 2025, 2024
To get an accurate forecast for the water temperature in Southwest Harbor for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Southwest Harbor, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of March.
You can choose any other years:
| Day |
2025 |
2024 |
Min |
Max |
| March 1 | 35.6°F | 37.4°F | 34.5°F | 39.9°F |
| March 2 | 35.2°F | 37°F | 34.7°F | 39.9°F |
| March 3 | 35.1°F | 39.2°F | 35.1°F | 39.2°F |
| March 4 | 35.6°F | 37.4°F | 34.7°F | 40.1°F |
| March 5 | 35.8°F | 37.6°F | 34.5°F | 38.7°F |
| March 6 | 35.8°F | 37.8°F | 34.5°F | 39.9°F |
| March 7 | 35.1°F | 37.9°F | 34.5°F | 40.1°F |
| March 8 | 35.1°F | 38.3°F | 35.1°F | 38.3°F |
| March 9 | 35.4°F | 37.9°F | 34.5°F | 39.4°F |
| March 10 | 34.9°F | 38.3°F | 34.9°F | 39.6°F |
| March 11 | 35.8°F | 38.5°F | 35.8°F | 39.2°F |
| March 12 | 35.4°F | 38.3°F | 35.4°F | 39.6°F |
| March 13 | 35.8°F | 37.6°F | 34.9°F | 39.4°F |
| March 14 | 34.7°F | 38.3°F | 34.7°F | 39.9°F |
| March 15 | 35.2°F | 38.3°F | 35.2°F | 39.7°F |
| Day |
2025 |
2024 |
Min |
Max |
| March 16 | 35.6°F | 38.5°F | 35.6°F | 39.7°F |
| March 17 | 35.4°F | 38.5°F | 35.4°F | 38.5°F |
| March 18 | 35.8°F | 38.8°F | 35.8°F | 38.8°F |
| March 19 | 37.2°F | 39.6°F | 34.9°F | 39.6°F |
| March 20 | 36.9°F | 38.1°F | 36.9°F | 41°F |
| March 21 | 36°F | 38.7°F | 35.6°F | 39.2°F |
| March 22 | 37.2°F | 39°F | 35.8°F | 39°F |
| March 23 | 37.8°F | 38.7°F | 35.6°F | 41.9°F |
| March 24 | 36.3°F | 38.7°F | 36°F | 41.2°F |
| March 25 | 37.4°F | 38.7°F | 35.8°F | 41.2°F |
| March 26 | 36.7°F | 39.7°F | 36.7°F | 39.7°F |
| March 27 | 37.9°F | 39.2°F | 35.8°F | 39.4°F |
| March 28 | 38.3°F | 39.2°F | 36.7°F | 39.9°F |
| March 29 | 37.9°F | 39.2°F | 36.1°F | 39.2°F |
| March 30 | 37°F | 38.8°F | 36°F | 39.4°F |
| March 31 | 39.2°F | 39.2°F | 35.2°F | 40.3°F |
Average water temperature in Southwest Harbor in March over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 39°F | 37.9°F | 38.8°F | 35.2°F | 38.7°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 38.5°F | 38.1°F | 39°F | 38.5°F | 36.1°F |
Southwest Harbor water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
