World sea water temperatures

Water temperature in Riantec

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This data the coastal Riantec 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 Riantec

Water temperature in Riantec today is 18.2°C. Based on our historical data over a period of ten years, the warmest water in this day in Riantec was recorded in 2022 and was 18.9°C, and the coldest was recorded in 2008 at 16.5°C. Sea water temperature in Riantec is expected to drop to 17.3°C in the next 10 days. September average water temperature in Riantec is 17.2°C, the minimum temperature is 15°C, and the maximum is 19.4°C.

Throughout the year, the water temperature in Riantec does not rise above 20°C and therefore is not suitable for comfortable swimming. But on some days of July, the water temperature warms up to 20°C and above. The average water temperature in Riantec in winter reaches 10.3°C, in spring 12°C, in summer the average temperature rises to 17.4°C, and in autumn it is 15.6°C.

Riantec water temperature now


5 September 2025
today temp
18.2°C
4 September 2025
yesterday temp
18.4°C


The sea salinity in Riantec is 34.52‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Riantec 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 Riantec. 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 Riantec. 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)

0-3 h3-6 h6-9 h9-12 h
4' 3"3' 10"3' 5"3' 2"
1.29 m1.16 m1.05 m0.96 m
12-15 h15-18 h18-21 h21-24 h
2' 11"2' 7"2' 5"2' 2"
0.88 m0.8 m0.73 m0.67 m

Surf report in Riantec

Riantec wave height and direction

Riantec weather forecast

Riantec wind speed and direction

Current temperature and weather

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

0-3 h3-6 h6-9 h9-12 h
13.6°C12.9°C12.4°C16.2°C
12-15 h15-18 h18-21 h21-24 h
19.2°C19.1°C17.9°C14.1°C

You may also be interested in other sections of our site for Riantec: Sunrise and Sunset, Tides

Riantec water temperature by month

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

MonthAvrMinMax
January10°C7°C12.4°Ccold
Sea water temperature in Riantec in January
February9.5°C7.8°C11.1°Ccold
Sea water temperature in Riantec in February
March10°C7.6°C12°Ccold
Sea water temperature in Riantec in March
April11.9°C8.6°C15.6°Ccold
Sea water temperature in Riantec in April
May14°C11.3°C17.4°Ccold
Sea water temperature in Riantec in May
June16.4°C13.1°C19.7°Ccold
Sea water temperature in Riantec in June
July17.7°C15.3°C20.3°Ccold
Sea water temperature in Riantec in July
August18.1°C15.6°C20.4°Ccold
Sea water temperature in Riantec in August
September17.2°C15°C19.4°Ccold
Sea water temperature in Riantec in September
October15.8°C12.8°C18.9°Ccold
Sea water temperature in Riantec in October
November13.7°C11.2°C16.6°Ccold
Sea water temperature in Riantec in November
December11.5°C9.3°C14.4°Ccold
Sea water temperature in Riantec in December

Chart monthly average water temperature in Riantec

Water temperature in Riantec

Where is the warmest sea water in the world?

If you want to plan a vacation on the beach and enjoy the warm sea, choose the day of the year, region and the minimum comfortable sea/ocean temperature that interests you. As a result, you will get a list of countries and cities in which the average sea temperature or maximum temperature on this day over the past 10 years exceeds your chosen value

Region
Date (day and month)
Water temperature: min 16°C
 Average temperature  Maximum temperature

Nearby beaches and cities

The nearest beaches and cities from Riantec 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

WaterWeatherWave
Gavres18.2°C19°C0.94 m
Sainte Helene18.4°C19°C0.82 m
Plouhinec18.4°C19°C0.82 m
Lomener17.9°C19°C1.06 m
Ploemeur17.9°C19°C1.06 m
Etel18.3°C19°C1.14 m
Groix17.8°C19°C1.46 m
Port Tudy17.8°C19°C1.46 m
Le Pouldu17.7°C19°C1.25 m
Guidel Plage17.6°C19°C1.39 m

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Riantec 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.

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