Water temperature in Unalaska (AK) in May
Is it warm enough to swim in Unalaska in May? Average water temperature in Unalaska in May is 40.8°F and therefore is not suitable for comfortable swimming. The warmest sea in Unalaska in May is 45.1°F, and the coldest is 37°F. Average high air temperature in Unalaska in May is 46°F, and average low temperature is 37°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Unalaska
Changes water temperature in Unalaska in May 2025, 2024
To get an accurate forecast for the water temperature in Unalaska for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Unalaska, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of May.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| May 1 | 40.5°F | 39.2°F | 37°F | 42.3°F |
| May 2 | 40.6°F | 39.4°F | 37.2°F | 42.3°F |
| May 3 | 40.5°F | 39.4°F | 37.8°F | 42.3°F |
| May 4 | 40.3°F | 39.4°F | 37.8°F | 42.6°F |
| May 5 | 40.3°F | 39.4°F | 37.4°F | 43°F |
| May 6 | 40.5°F | 39.7°F | 37.8°F | 42.6°F |
| May 7 | 40.6°F | 39.7°F | 37.6°F | 42.4°F |
| May 8 | 40.6°F | 39.2°F | 37.6°F | 42.3°F |
| May 9 | 40.6°F | 39.2°F | 38.1°F | 42.6°F |
| May 10 | 40.5°F | 39.7°F | 38.5°F | 42.8°F |
| May 11 | 41°F | 39.6°F | 38.5°F | 42.8°F |
| May 12 | 41.2°F | 39.6°F | 38.3°F | 42.6°F |
| May 13 | 41.5°F | 40.1°F | 38.5°F | 43.2°F |
| May 14 | 42.1°F | 40.6°F | 38.1°F | 44.1°F |
| May 15 | 41.9°F | 40.5°F | 38.1°F | 44.4°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| May 16 | 41.5°F | 40.3°F | 37.9°F | 44.1°F |
| May 17 | 42.4°F | 40.6°F | 37.9°F | 44.6°F |
| May 18 | 43°F | 40.3°F | 37.9°F | 45°F |
| May 19 | 42.6°F | 40.3°F | 38.7°F | 44.6°F |
| May 20 | 42.4°F | 40.5°F | 39°F | 44.4°F |
| May 21 | 42.3°F | 40.5°F | 39.2°F | 44.6°F |
| May 22 | 42.1°F | 40.8°F | 39.6°F | 44.2°F |
| May 23 | 41.9°F | 40.8°F | 39.6°F | 44.4°F |
| May 24 | 42.4°F | 40.8°F | 39.7°F | 44.4°F |
| May 25 | 42.3°F | 41°F | 39.6°F | 45.1°F |
| May 26 | 43.2°F | 40.5°F | 39.4°F | 44.8°F |
| May 27 | 43.5°F | 40.6°F | 39.6°F | 44.1°F |
| May 28 | 43.3°F | 40.6°F | 39.6°F | 45°F |
| May 29 | 43.3°F | 40.8°F | 39°F | 45°F |
| May 30 | 43.2°F | 41°F | 39.7°F | 45°F |
| May 31 | 43.2°F | 42.4°F | 39.7°F | 44.1°F |
Average water temperature in Unalaska in May over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 43.3°F | 41.4°F | 41.4°F | 42.4°F | 41.7°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 41.5°F | 41.2°F | 40.5°F | 40.3°F | 41.7°F |
Unalaska sea state in May
Chart comparing the height of waves in Unalaska in May 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 Unalaska in May
This data display average monthly climate indicators in Unalaska in May 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 temperature46°F
- Average LOW temperature37°F
- Average rainfall days17 days
- Average rainfall102mm/4''
- Average daylight16h
- Average sunshine8h
- Average UV index5
- Average snowfall5mm/0.2''
Unalaska water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
