This data the coastal St Helens 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.
Water temperature in St Helens today is 12.9°C. Based on our historical data over a period of ten years, the warmest water in this day in the Tasman Sea near St Helens was recorded in 2014 and was 13.2°C, and the coldest was recorded in 2019 at 12°C. Sea water temperature in St Helens is expected to drop to 12.5°C in the next 10 days. September average water temperature in St Helens is 12.6°C, the minimum temperature is 11.4°C, and the maximum is 13.8°C.
Throughout the year, the water temperature in St Helens does not rise above 20°C and therefore is not suitable for comfortable swimming. The average water temperature in St Helens in winter reaches 13.2°C, in spring 13.3°C, in summer the average temperature rises to 17.1°C, and in autumn it is 16.9°C.
5 September 2025 |
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today temp |
12.9°C |
4 September 2025 |
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yesterday temp |
13.1°C |
The ocean salinity in St Helens is 35.43‰, and the average salinity of the World Ocean is 35‰.
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 St Helens. 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 St Helens. 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)
0-3 h | 3-6 h | 6-9 h | 9-12 h |
---|---|---|---|
2' 6" | 2' 11" | 2' 11" | 2' 10" |
0.77 m | 0.88 m | 0.89 m | 0.86 m |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
2' 9" | 2' 7" | 2' 6" | 2' 5" |
0.83 m | 0.8 m | 0.76 m | 0.74 m |
Data in a table show St Helens temperature today (5 September 2025). For more information and forecast for a few days, go to the weather forecast St Helens.
0-3 h | 3-6 h | 6-9 h | 9-12 h |
---|---|---|---|
![]() | ![]() | ![]() | ![]() |
-0.6°C | -0.6°C | -0.4°C | 8.6°C |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
![]() | ![]() | ![]() | ![]() |
12°C | 12.3°C | 4.9°C | 1.1°C |
You may also be interested in other sections of our site for St Helens: Sunrise and Sunset, Tides
These figures shows the average, minimum and maximum monthly sea temperature in St Helens. 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 St Helens 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 | 17.4°C | 14.8°C | 20.3°C | cold |
Ocean water temperature in St Helens in January | ||||
February | 18.2°C | 16.4°C | 20.6°C | cold |
Ocean water temperature in St Helens in February | ||||
March | 18.1°C | 16.6°C | 20.2°C | cold |
Ocean water temperature in St Helens in March | ||||
April | 17°C | 15.3°C | 18.8°C | cold |
Ocean water temperature in St Helens in April | ||||
May | 15.6°C | 13.5°C | 17.9°C | cold |
Ocean water temperature in St Helens in May | ||||
June | 14.1°C | 12.6°C | 15.5°C | cold |
Ocean water temperature in St Helens in June | ||||
July | 13.1°C | 11.5°C | 14.5°C | cold |
Ocean water temperature in St Helens in July | ||||
August | 12.5°C | 11.4°C | 13.6°C | cold |
Ocean water temperature in St Helens in August | ||||
September | 12.6°C | 11.4°C | 13.8°C | cold |
Ocean water temperature in St Helens in September | ||||
October | 13°C | 11.2°C | 14.7°C | cold |
Ocean water temperature in St Helens in October | ||||
November | 14.3°C | 12.6°C | 17.1°C | cold |
Ocean water temperature in St Helens in November | ||||
December | 15.8°C | 13.5°C | 18.3°C | cold |
Ocean water temperature in St Helens in December |