Water temperature in Porthcothan

This data the coastal Porthcothan 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 Porthcothan

Water temperature in Porthcothan today is 17.5°C. Based on our historical data over a period of ten years, the warmest water in this day in the Celtic Sea near Porthcothan was, like today, 17.5°C, and the coldest was recorded in 2015 at 15.5°C. Sea water temperature in Porthcothan is expected to drop to 16.2°C in the next 10 days. September average water temperature in Porthcothan is 16.2°C, the minimum temperature is 14.7°C, and the maximum is 17.9°C.

Throughout the year, the water temperature in Porthcothan does not rise above 20°C and therefore is not suitable for comfortable swimming. The average water temperature in Porthcothan in winter reaches 10.1°C, in spring 10.6°C, in summer the average temperature rises to 15.9°C, and in autumn it is 14.7°C.

Porthcothan water temperature now

The sea salinity in Porthcothan is 33.74‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Porthcothan 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 Porthcothan. 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 Porthcothan. Data in table shown for 6 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Porthcothan

Porthcothan weather forecast

Current temperature and weather

Data in a table show Porthcothan temperature today (6 September 2025). For more information and forecast for a few days, go to the weather forecast Porthcothan.

0-3 h	3-6 h	6-9 h	9-12 h
15.3°C	14.8°C	14.6°C	16.4°C

12-15 h	15-18 h	18-21 h	21-24 h
17.2°C	17.3°C	16.2°C	14.7°C

Porthcothan water temperature by month

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

The nearest beaches and cities from Porthcothan 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
Treyarnon	17.5°C	17°C		1.37 m
Harlyn	17.3°C	17°C		1.38 m
Trevone	17.3°C	17°C		1.38 m
Polzeath	17.3°C	17°C		1.38 m
Daymer Bay	17.3°C	17°C		1.38 m
Lundy Bay	17.4°C	17°C		1.41 m
Port Quin	17.4°C	17°C		1.41 m
Perranporth	17.4°C	18°C		1.53 m
Saint Agnes	17.4°C	18°C		1.53 m
Wadebridge	17.4°C	17°C		1.41 m

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Our report for Porthcothan 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.