Water temperature in Koper

This data the coastal Koper 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 Koper

Water temperature in Koper today is 19.4°C. Based on our historical data over a period of ten years, the warmest water in this day in the Adriatic Sea near Koper was recorded in 2023 and was 21.5°C, and the coldest was recorded in 2021 at 17.7°C. Sea water temperature in Koper is expected to drop to 18.2°C in the next 10 days. October average water temperature in Koper is 19.4°C, the minimum temperature is 16.1°C, and the maximum is 23°C.

The swimming season in Koper lasts from June to October. During those months, Koper water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Koper in winter reaches 10.9°C, in spring 13.9°C, in summer the average temperature rises to 24.7°C, and in autumn it is 19.4°C.

Koper water temperature now

The sea salinity in Koper is 35.88‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Koper 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 Koper. 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 Koper. Data in table shown for 18 October 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Koper

Koper weather forecast

Current temperature and weather

Data in a table show Koper temperature today (18 October 2025). For more information and forecast for a few days, go to the weather forecast Koper.

0-3 h	3-6 h	6-9 h	9-12 h
9°C	8.1°C	7.3°C	13.6°C

12-15 h	15-18 h	18-21 h	21-24 h
18.2°C	17.9°C	12.3°C	8.7°C

Koper water temperature by month

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

The nearest beaches and cities from Koper 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
Jagodje	19.4°C	18°C		0.34 m
Trieste	19.4°C	18°C		0.34 m
Ankaran	19.4°C	18°C		0.25 m
Muggia	19.4°C	18°C		0.25 m
Strunjan	19.6°C	18°C		0.26 m
Portoroz	19.6°C	17°C		0.15 m
Kanegra	19.6°C	17°C		0.15 m
Sistiana	19.3°C	18°C		0.28 m
Duino	19.2°C	18°C		0.28 m
Savudrija	19.6°C	17°C		0.25 m

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Capodistria, Kopar

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Our report for Koper 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.