Unalaska water temp
This data the coastal Unalaska ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current ocean temperature in Unalaska
Water temperature in Unalaska today is 46.8°F. Based on our historical data over a period of ten years, the warmest water in this day in Unalaska was recorded in 2014 and was 48.6°F, and the coldest was recorded in 2009 at 44.8°F. Sea water temperature in Unalaska is expected to drop to 46°F in the next 10 days. September average water temperature in Unalaska is 47.5°F, the minimum temperature is 44.4°F, and the maximum is 53.4°F.
Throughout the year, the water temperature in Unalaska does not rise above 68°F and therefore is not suitable for comfortable swimming. The average water temperature in Unalaska in winter reaches 39.9°F, in spring 39.2°F, in summer the average temperature rises to 46.4°F, and in autumn it is 45.3°F.
Unalaska water temperature now
| September 26, 2025 |
|---|
| today temp |
| 46.8°F |
| September 25, 2025 |
|---|
| yesterday temp |
| 46.9°F |
The ocean salinity in Unalaska is 32.22‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Unalaska for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Unalaska. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Unalaska. Data in table shown for September 26, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 5' 7" | 5' 1" | 4' 9" | 4' 6" |
| 1.69 m | 1.56 m | 1.46 m | 1.37 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 4' 4" | 4' 2" | 3' 10" | 3' 10" |
| 1.33 m | 1.26 m | 1.18 m | 1.17 m |
Surf report in Unalaska
Unalaska weather forecast
Current temperature and weather
Data in a table show Unalaska temperature today (September 26, 2025). For more information and forecast for a few days, go to the weather forecast Unalaska.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | |  |  |
| 45.3°F | 45.5°F | 45.7°F | 45.7°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| | | |
| 46.8°F | 47.7°F | 47.7°F | 47.1°F |
You may also be interested in other sections of our site for Unalaska: Sunrise and Sunset, Tides
Unalaska water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Unalaska. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Unalaska on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 39.7°F | 36.5°F | 41.7°F | cold |
| Ocean water temperature in Unalaska in January | ||||
| February | 38.7°F | 35.6°F | 41.2°F | cold |
| Ocean water temperature in Unalaska in February | ||||
| March | 38.3°F | 34.3°F | 40.6°F | cold |
| Ocean water temperature in Unalaska in March | ||||
| April | 38.7°F | 34.7°F | 42.3°F | cold |
| Ocean water temperature in Unalaska in April | ||||
| May | 40.8°F | 37°F | 45.1°F | cold |
| Ocean water temperature in Unalaska in May | ||||
| June | 43.9°F | 39.2°F | 48.6°F | cold |
| Ocean water temperature in Unalaska in June | ||||
| July | 46.9°F | 39.6°F | 52.2°F | cold |
| Ocean water temperature in Unalaska in July | ||||
| August | 48.6°F | 45°F | 53.2°F | cold |
| Ocean water temperature in Unalaska in August | ||||
| September | 47.5°F | 44.4°F | 53.4°F | cold |
| Ocean water temperature in Unalaska in September | ||||
| October | 45.3°F | 43°F | 48.4°F | cold |
| Ocean water temperature in Unalaska in October | ||||
| November | 43.2°F | 39.4°F | 45.7°F | cold |
| Ocean water temperature in Unalaska in November | ||||
| December | 41.4°F | 37.4°F | 43.9°F | cold |
| Ocean water temperature in Unalaska in December | ||||
Chart monthly average water temperature in Unalaska
