Water temperature in Oslofjord

This data the coastal Oslofjord 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 Oslofjord

Water temperature in Oslofjord today is 13.7°C. Based on our historical data over a period of ten years, the warmest water in this day in Oslofjord was recorded in 2016 and was 15.5°C, and the coldest was recorded in 2012 at 12.4°C. Sea water temperature in Oslofjord is expected to drop to 12°C in the next 10 days. September average water temperature in Oslofjord is 15.1°C, the minimum temperature is 12.3°C, and the maximum is 17.9°C.

The swimming season in Oslofjord lasts only one month - July. During this month, Oslofjord water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Oslofjord in winter reaches 2.9°C, in spring 6.1°C, in summer the average temperature rises to 17.3°C, and in autumn it is 11.6°C.

Oslofjord water temperature now

The sea salinity in Oslofjord is 21.94‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Oslofjord 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 Oslofjord. 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 Oslofjord. Data in table shown for 27 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Oslofjord

Oslofjord weather forecast

Current temperature and weather

Data in a table show Oslofjord temperature today (27 September 2025). For more information and forecast for a few days, go to the weather forecast Oslofjord.

0-3 h	3-6 h	6-9 h	9-12 h
5.6°C	4.8°C	4.1°C	10.6°C

12-15 h	15-18 h	18-21 h	21-24 h
14.5°C	15.3°C	8.4°C	7.3°C

Oslofjord water temperature by month

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

The nearest beaches and cities from Oslofjord 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
Horten	14.7°C	14°C		0.04 m
Asgardstrand	14.5°C	14°C		0.19 m
Oslo	14.3°C	14°C		0.23 m
Tonsberg	13.8°C	14°C		0.2 m
Fredrikstad	12.9°C	15°C		0.17 m
Melsomvik	14.1°C	14°C		0.18 m
Sandefjord	14.5°C	14°C		0.37 m
Stavern	14.5°C	13°C		0.37 m
Rafnes	13.7°C	14°C		0.15 m
Porsgrunn	13.7°C	14°C		0.15 m

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Our report for Oslofjord 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.