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 54.1°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 2019 and was 54.5°F, and the coldest was recorded in 2008 at 50.5°F. Sea water temperature in Cook Inlet is expected to drop to 50.9°F in the next 10 days. September average water temperature in Cook Inlet is 52.7°F, the minimum temperature is 49.1°F, and the maximum is 56.7°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

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 September 20, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Cook Inlet

Cook Inlet weather forecast

Current temperature and weather

Data in a table show Cook Inlet temperature today (September 20, 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
49.3°F	49.1°F	48.4°F	48°F

12-15 h	15-18 h	18-21 h	21-24 h
50.2°F	52.3°F	51.3°F	50.4°F

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

Chart monthly average water temperature in Cook Inlet

The nearest beaches and cities from Cook Inlet with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Anchor Point	51.1°F	50°F		1' 6"
Togiak	52.3°F	51.8°F		0' 8"
Yakutat	55.8°F	50°F		7' 3"
Glacier Bay	49.5°F	51.8°F		0' 6"
Haines	51.1°F	50°F		0' 1"
Gustavus	50.5°F	51.8°F		1' 1"
Skagway	50.5°F	50°F		0' 1"
Juneau	51.4°F	48.2°F		0' 4"
Sitka	54°F	53.6°F		4' 10"
Diomede	45°F	42.8°F		4' 0"

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Our report for Cook Inlet is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.