World sea water temperatures

Water temperature in Ondarroa

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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 21.2°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 2016 and was 22.4°C, and the coldest was recorded in 2015 at 20.5°C. Sea water temperature in Ondarroa is expected to rise to 21.3°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


5 September 2025
today temp
21.2°C
4 September 2025
yesterday temp
21.4°C


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 5 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"4' 0"3' 9"3' 6"
1.29 m1.22 m1.15 m1.07 m
12-15 h15-18 h18-21 h21-24 h
3' 5"3' 3"3' 3"3' 1"
1.03 m1 m0.98 m0.95 m

Surf report in Ondarroa

Ondarroa wave height and direction

Ondarroa weather forecast

Ondarroa wind speed and direction

Current temperature and weather

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

0-3 h3-6 h6-9 h9-12 h
14.9°C14.7°C14.6°C18.4°C
12-15 h15-18 h18-21 h21-24 h
21.4°C23.4°C22.1°C17.9°C

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

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

MonthAvrMinMax
January12.9°C11.4°C14.8°Ccold
Sea water temperature in Ondarroa in January
February12.3°C10.9°C13.5°Ccold
Sea water temperature in Ondarroa in February
March12.5°C11.1°C13.5°Ccold
Sea water temperature in Ondarroa in March
April13.4°C11.7°C15.6°Ccold
Sea water temperature in Ondarroa in April
May15.7°C13.5°C20.2°Ccold
Sea water temperature in Ondarroa in May
June18.9°C14.3°C22.7°Ccold
Sea water temperature in Ondarroa in June
July21.5°C19.1°C24.5°Cwarm
Sea water temperature in Ondarroa in July
August22.2°C20.7°C24.5°Cwarm
Sea water temperature in Ondarroa in August
September21°C18.7°C23.3°Cwarm
Sea water temperature in Ondarroa in September
October18.4°C15.5°C21.1°Ccold
Sea water temperature in Ondarroa in October
November15.9°C13.7°C19.2°Ccold
Sea water temperature in Ondarroa in November
December14°C12.2°C16.3°Ccold
Sea water temperature in Ondarroa in December

Chart monthly average water temperature in Ondarroa

Water temperature in Ondarroa

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 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

WaterWeatherWave
Ibarrangelu21.1°C25°C0.94 m
Orio21.5°C23°C1.06 m
Sukarrieta21.2°C25°C1.48 m
Bakio21.2°C25°C1.53 m
Zurriola Beach21.6°C24°C1.14 m
Ondarreta Beach21.6°C24°C1.14 m
San Sebastian21.6°C24°C1.14 m
La Concha Beach21.7°C24°C1.14 m
Pasaia21.7°C24°C1.14 m
Arminza21.2°C23°C1.15 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 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.

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