Water temperature in St Mary's

This data the coastal St Mary's 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 St Mary's

Water temperature in St Mary's today is 14.7°C. Based on our historical data over a period of ten years, the warmest water in this day in the Celtic Sea near St Mary's was recorded in 2022 and was 16.2°C, and the coldest was recorded in 2015 at 14.6°C. Sea water temperature in St Mary's is expected to be constant 14.7°C in the next 10 days. September average water temperature in St Mary's is 15.9°C, the minimum temperature is 14°C, and the maximum is 18.7°C.

Throughout the year, the water temperature in St Mary's does not rise above 20°C and therefore is not suitable for comfortable swimming. The average water temperature in St Mary's in winter reaches 10.8°C, in spring 10.8°C, in summer the average temperature rises to 15.9°C, and in autumn it is 14.3°C.

St Mary's water temperature now

The sea salinity in St Mary's is 35.00‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in St Mary's 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 St Mary's. 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 Mary's. Data in table shown for 26 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in St Mary's

St Mary's weather forecast

Current temperature and weather

Data in a table show St Mary's temperature today (26 September 2025). For more information and forecast for a few days, go to the weather forecast St Mary's.

0-3 h	3-6 h	6-9 h	9-12 h
14.1°C	14.2°C	14.2°C	14°C

12-15 h	15-18 h	18-21 h	21-24 h
14.3°C	14.4°C	14.4°C	14.5°C

St Mary's water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in St Mary's. 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 Mary's 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 St Mary's

The nearest beaches and cities from St Mary's 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
Land's End	15°C	15°C		0.85 m
Saint Just	14.3°C	15°C		0.75 m
Sennen	14.3°C	15°C		0.75 m
Sennen Cove	14.8°C	15°C		0.75 m
Porthcurno	15.2°C	15°C		0.83 m
Mousehole	14.7°C	15°C		0.52 m
Newlyn	14.7°C	15°C		0.52 m
Porthmeor	14.3°C	15°C		0.64 m
Penzance	14.6°C	15°C		0.52 m
Marazion	14.6°C	15°C		0.52 m

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Our report for St Mary's 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.