Water temperature in Harlyn

This data the coastal Harlyn 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 Harlyn

Water temperature in Harlyn today is 16.6°C. Based on our historical data over a period of ten years, the warmest water in this day in the Celtic Sea near Harlyn was recorded in 2019 and was 17.3°C, and the coldest was recorded in 2015 at 15.2°C. Sea water temperature in Harlyn is expected to drop to 15.5°C in the next 10 days. September average water temperature in Harlyn is 16.3°C, the minimum temperature is 14.9°C, and the maximum is 18.1°C.

Throughout the year, the water temperature in Harlyn does not rise above 20°C and therefore is not suitable for comfortable swimming. The average water temperature in Harlyn in winter reaches 10°C, in spring 10.5°C, in summer the average temperature rises to 15.9°C, and in autumn it is 14.8°C.

Harlyn water temperature now

The sea salinity in Harlyn is 33.35‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Harlyn 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 Harlyn. 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 Harlyn. 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 Harlyn

Harlyn weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
11.2°C	10.3°C	10.7°C	12.8°C

12-15 h	15-18 h	18-21 h	21-24 h
14.6°C	14.3°C	12.1°C	11.4°C

Harlyn water temperature by month

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

The nearest beaches and cities from Harlyn 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
Trevone	16.6°C	14°C		0.73 m
Daymer Bay	16.6°C	14°C		0.73 m
Treyarnon	16.6°C	14°C		0.73 m
Lundy Bay	16.6°C	14°C		0.75 m
Port Quin	16.6°C	14°C		0.75 m
Newquay	16.6°C	14°C		0.8 m
Tintagel	16.7°C	15°C		0.83 m
Holywell	16.6°C	14°C		0.83 m
Saint Austell	15.3°C	14°C		0.39 m
Par	15.3°C	14°C		0.4 m

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Harlyn Bay, Harlyn Bay Beach, Harlyn Beach

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Our report for Harlyn 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.