Saint Helier Sea Temperature
Looking to find out what the sea water temperature in Saint Helier is for today and the next few days? Below are data and charts that will give you information about sea temperatures in Saint Helier and nearby locations.
Water temperature in Saint Helier right now
Below is the current sea temperature for Saint Helier, Channel Islands on 25th June 2025.
16.17° C
(61.11° F)
- yesterday: 16.03° C (60.86° F)
- a week ago: 15.46° C (59.83° F)
At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.
The average sea temperature for Saint Helier on June 25th over the last 10 years is 15.21° C (59.38° F), with a low temperature of 13.42° C (56.16° F) and a high of 16.35° C (61.43° F).
Analysis and forecast for Saint Helier water temperatures
The water temperature in Saint Helier today is higher than the average temperature of 15.21° C (59.38° F) and the temperature on this day last year, 25th June 2024, was 16.13° C (61.03° F).
The chart and table below shows the change in water temperature in Saint Helier over the last 30 days:
The actual nearshore temperatures may vary by several degrees and this can also be heavily affected by weather. Strong winds can cause cold, deep waters to replace the surface waters that had been warmed by the sun, and heavy rain can also reduce the temperature of the sea surface temperature as well.
Water temperature in Saint Helier by month
The chart below shows the monthly average water temperature in Saint Helier.
For more detailed information on how the sea temperature in Saint Helier changes for each month of the year, choose from the months below.
Saint Helier map and nearby water temperatures
Locations near Saint Helier
The highest temperature in Channel Islands today is 14.89° C (58.8° F) in Jersey. The lowest is in Alderney, where the temperature of the water is 14.06° C (57.31° F).
Why measure sea surface temperatures (SST) in Saint Helier?
The ocean covers about 71% of the Earth's surface, and scientists record the sea surface temperature (SST) of locations such as Saint Helier because they want to understand and learn how the ocean communicates with the atomosphere of Earth.
SST is one measure that provides information on the global climate, and it can be used to predict the weather in Saint Helier as well as atmospheric model simulations and to study marine ecosystems in the area.
Data source and citation
Raw data for the calculations made to find the sea surface temperature in Saint Helier comes from the National Oceanic and Atmospheric Administration (NOAA) and their 1/4° daily Optimum Interpolation Sea Surface Temperature.
The water temperature data is constructed by combining observations from different platforms (satellites, ships, buoys, and Argo floats) on a regular global grid. A spatially complete sea surface temperature map is then built by interpolating to fill in gaps in the data.
If you'd like to use any of the information above in the format it is presented, please use the citation tool below.
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<a href="http://seatemperatures.net/europe/channel-islands/saint-helier/">Saint Helier Sea Temperature</a>
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"Saint Helier Sea Temperature". SeaTemperatures.net. Accessed on June 25, 2025. http://seatemperatures.net/europe/channel-islands/saint-helier/.
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"Saint Helier Sea Temperature". SeaTemperatures.net, http://seatemperatures.net/europe/channel-islands/saint-helier/. Accessed 25 June, 2025
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Saint Helier Sea Temperature. SeaTemperatures.net. Retrieved from http://seatemperatures.net/europe/channel-islands/saint-helier/.