Water temperature in Ondarreta Beach

This data the coastal Ondarreta Beach 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 Ondarreta Beach

Water temperature in Ondarreta Beach today is 21.6°C. Based on our historical data over a period of ten years, the warmest water in this day in the Cantabrian Sea near Ondarreta Beach was recorded in 2016 and was 22.5°C, and the coldest was recorded in 2007 at 20.6°C. Sea water temperature in Ondarreta Beach is expected to drop to 21.3°C in the next 10 days. September average water temperature in Ondarreta Beach is 21.1°C, the minimum temperature is 18.8°C, and the maximum is 23.3°C.

The swimming season in Ondarreta Beach lasts from June to September. During those months, Ondarreta Beach water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Ondarreta Beach in winter reaches 13°C, in spring 14°C, in summer the average temperature rises to 21.1°C, and in autumn it is 18.5°C.

Ondarreta Beach water temperature now

The sea salinity in Ondarreta Beach is 34.51‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Ondarreta Beach 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 Ondarreta Beach. 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 Ondarreta Beach. 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 Ondarreta Beach

Ondarreta Beach weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
12.5°C	12°C	12°C	18.7°C

12-15 h	15-18 h	18-21 h	21-24 h
21.9°C	24.2°C	21.8°C	15.3°C

Ondarreta Beach water temperature by month

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

The nearest beaches and cities from Ondarreta Beach 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
Hendaye	22.6°C	23°C		1.37 m
Ciboure	22.6°C	23°C		1.37 m
Saint-Jean-de-Luz	22.6°C	23°C		1.37 m
Bidart	22.6°C	23°C		1.37 m
Mimizan Plage	22.6°C	23°C		1.37 m
Socoa	22.6°C	23°C		1.37 m
Guethary	22.5°C	24°C		1.37 m
Biarritz	22.4°C	24°C		1.37 m
La Cote des Basques	22.4°C	24°C		1.37 m
Port Vieux	22.4°C	24°C		1.37 m

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Our report for Ondarreta Beach 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.