Water temperature in Cook Strait

This data the coastal Cook Strait sea 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 sea temperature in Cook Strait

Water temperature in Cook Strait today is 13°C. Based on our historical data over a period of ten years, the warmest water in this day in the Tasman Sea near Cook Strait was recorded in 2022 and was 13.5°C, and the coldest was recorded in 2011 at 11.2°C. Sea water temperature in Cook Strait is expected to drop to 12.5°C in the next 10 days. September average water temperature in Cook Strait is 12.5°C, the minimum temperature is 11°C, and the maximum is 14.1°C.

Throughout the year, the water temperature in Cook Strait does not rise above 20°C and therefore is not suitable for comfortable swimming. The average water temperature in Cook Strait in winter reaches 12.6°C, in spring 13.1°C, in summer the average temperature rises to 15.7°C, and in autumn it is 15.2°C.

Cook Strait water temperature now

The sea salinity in Cook Strait is 35.11‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Cook Strait 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 Strait. 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 Strait. Data in table shown for 5 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Cook Strait

Cook Strait weather forecast

Current temperature and weather

Data in a table show Cook Strait temperature today (5 September 2025). For more information and forecast for a few days, go to the weather forecast Cook Strait.

0-3 h	3-6 h	6-9 h	9-12 h
13.1°C	13°C	12.7°C	12.7°C

12-15 h	15-18 h	18-21 h	21-24 h
12.6°C	12.6°C	13°C	11.8°C

Cook Strait water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Cook Strait. 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 Strait 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 Strait

The nearest beaches and cities from Cook Strait 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
Marlborough Sounds	11.9°C	15°C		0.56 m
Lyall Bay	13°C	14°C		1.48 m
Houghton Bay	13°C	14°C		1.48 m
Island Bay	13°C	14°C		1.48 m
Princess Bay	13°C	14°C		1.48 m
Oriental Bay	12.7°C	14°C		1.46 m
Hataitai	12.7°C	14°C		1.46 m
Evans Bay	12.7°C	14°C		1.46 m
Breaker Bay	12.6°C	14°C		1.48 m
Seatoun	12.6°C	14°C		1.48 m

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Our report for Cook Strait 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.