Water temperature in Holywell

This data the coastal Holywell 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 Holywell

Water temperature in Holywell 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 Holywell was recorded in 2018 and was 17.3°C, and the coldest was recorded in 2015 at 15.3°C. Sea water temperature in Holywell is expected to drop to 16°C in the next 10 days. September average water temperature in Holywell is 16°C, the minimum temperature is 14.4°C, and the maximum is 17.5°C.

Throughout the year, the water temperature in Holywell does not rise above 20°C and therefore is not suitable for comfortable swimming. The average water temperature in Holywell in winter reaches 10.2°C, in spring 10.5°C, in summer the average temperature rises to 15.6°C, and in autumn it is 14.5°C.

Holywell water temperature now

The sea salinity in Holywell is 34.12‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Holywell 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 Holywell. 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 Holywell. 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)

Surf report in Holywell

Holywell weather forecast

Current temperature and weather

Data in a table show Holywell temperature today (5 September 2025). For more information and forecast for a few days, go to the weather forecast Holywell.

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

Holywell water temperature by month

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

The nearest beaches and cities from Holywell 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
Watergate Bay	17.5°C	17°C		1.47 m
Fistral Beach	17.5°C	17°C		1.47 m
Mawgan Porth	17.6°C	17°C		1.47 m
Porthtowan	17.3°C	17°C		1.16 m
Portreath	17.3°C	17°C		1.16 m
Porthminster Beach	17.3°C	17°C		1.16 m
Constantine Bay	17.5°C	17°C		1.37 m
Porthcothan	17.5°C	17°C		1.37 m
Treyarnon	17.5°C	17°C		1.37 m
Hayle	17.2°C	17°C		1.16 m

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Holywell Bay

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Our report for Holywell 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.