Cook Inlet water temp
This data the coastal Cook Inlet 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 Cook Inlet
Water temperature in Cook Inlet today is 46.4°F. Based on our historical data over a period of ten years, the warmest water in this day in the Gulf of Alaska near Cook Inlet was recorded in 2018 and was 46.8°F, and the coldest was recorded in 2008 at 41.2°F. Sea water temperature in Cook Inlet is expected to drop to 42.4°F in the next 10 days. November average water temperature in Cook Inlet is 41.9°F, the minimum temperature is 35.8°F, and the maximum is 47.3°F.
Throughout the year, the water temperature in Cook Inlet does not rise above 68°F and therefore is not suitable for comfortable swimming. The average water temperature in Cook Inlet in winter reaches 36°F, in spring 36.9°F, in summer the average temperature rises to 51.4°F, and in autumn it is 47.5°F.
Cook Inlet water temperature now
| November 4, 2025 |
|---|
| today temp |
| 46.4°F |
| November 3, 2025 |
|---|
| yesterday temp |
| 46.4°F |
The ocean salinity in Cook Inlet is 29.09‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Cook Inlet 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 Cook Inlet. 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 Cook Inlet. Data in table shown for November 4, 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 |
|---|---|---|---|
| 0' 10" | 1' 0" | 1' 1" | 0' 10" |
| 0.26 m | 0.3 m | 0.32 m | 0.25 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 0' 8" | 0' 7" | 0' 7" | 0' 7" |
| 0.21 m | 0.19 m | 0.18 m | 0.17 m |
Surf report in Cook Inlet
Cook Inlet weather forecast
Current temperature and weather
Data in a table show Cook Inlet temperature today (November 4, 2025). For more information and forecast for a few days, go to the weather forecast Cook Inlet.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 |  |  |  |
| 34°F | 33.1°F | 33.4°F | 34°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
|  |  |  |
| 35.1°F | 37.6°F | 34.3°F | 34.5°F |
You may also be interested in other sections of our site for Cook Inlet: Sunrise and Sunset, Tides
Cook Inlet water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Cook Inlet. 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 Cook Inlet 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 | 35.8°F | 30.7°F | 39.4°F | cold |
| Ocean water temperature in Cook Inlet in January | ||||
| February | 34.5°F | 30.6°F | 37.6°F | cold |
| Ocean water temperature in Cook Inlet in February | ||||
| March | 34.2°F | 30.9°F | 36.9°F | cold |
| Ocean water temperature in Cook Inlet in March | ||||
| April | 35.4°F | 31.6°F | 41.4°F | cold |
| Ocean water temperature in Cook Inlet in April | ||||
| May | 40.8°F | 35.2°F | 48.2°F | cold |
| Ocean water temperature in Cook Inlet in May | ||||
| June | 47.3°F | 42.1°F | 54.1°F | cold |
| Ocean water temperature in Cook Inlet in June | ||||
| July | 52.5°F | 47.8°F | 58.6°F | cold |
| Ocean water temperature in Cook Inlet in July | ||||
| August | 54.5°F | 50.4°F | 59.2°F | cold |
| Ocean water temperature in Cook Inlet in August | ||||
| September | 52.7°F | 49.1°F | 56.7°F | cold |
| Ocean water temperature in Cook Inlet in September | ||||
| October | 48°F | 42.1°F | 52.7°F | cold |
| Ocean water temperature in Cook Inlet in October | ||||
| November | 41.9°F | 35.8°F | 47.3°F | cold |
| Ocean water temperature in Cook Inlet in November | ||||
| December | 37.4°F | 31.6°F | 42.6°F | cold |
| Ocean water temperature in Cook Inlet in December | ||||
Chart monthly average water temperature in Cook Inlet
