Water temperature in Ondarroa

This data the coastal Ondarroa 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 Ondarroa

Water temperature in Ondarroa today is 20.4°C. Based on our historical data over a period of ten years, the warmest water in this day in the Cantabrian Sea near Ondarroa was recorded in 2011 and was 21.1°C, and the coldest was recorded in 2015 at 19.4°C. Sea water temperature in Ondarroa is expected to drop to 19.3°C in the next 10 days. September average water temperature in Ondarroa is 21°C, the minimum temperature is 18.7°C, and the maximum is 23.3°C.

The swimming season in Ondarroa lasts from July to September. During those months, Ondarroa water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Ondarroa in winter reaches 13.1°C, in spring 13.9°C, in summer the average temperature rises to 20.9°C, and in autumn it is 18.4°C.

Ondarroa water temperature now

The sea salinity in Ondarroa is 34.61‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Ondarroa 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 Ondarroa. 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 Ondarroa. Data in table shown for 25 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Ondarroa

Ondarroa weather forecast

Current temperature and weather

Data in a table show Ondarroa temperature today (25 September 2025). For more information and forecast for a few days, go to the weather forecast Ondarroa.

0-3 h	3-6 h	6-9 h	9-12 h
13.1°C	13.1°C	10.5°C	14.5°C

12-15 h	15-18 h	18-21 h	21-24 h
17.4°C	17.4°C	16.1°C	14.1°C

Ondarroa water temperature by month

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

The nearest beaches and cities from Ondarroa 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
Ibarrangelu	20.5°C	19°C		0.43 m
Orio	20.6°C	17°C		0.45 m
Sukarrieta	20.6°C	19°C		0.56 m
Bakio	20.7°C	19°C		0.57 m
Zurriola Beach	20.7°C	18°C		0.47 m
Ondarreta Beach	20.7°C	18°C		0.47 m
San Sebastian	20.7°C	18°C		0.47 m
La Concha Beach	20.7°C	18°C		0.47 m
Pasaia	20.7°C	18°C		0.47 m
Arminza	20.7°C	17°C		0.45 m

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Our report for Ondarroa 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.