Helsinki Sea Temperature

Looking to find out what the sea water temperature in Helsinki is for today and the next few days? Below are data and charts that will give you information about sea temperatures in Helsinki and nearby locations.

Water temperature in Helsinki right now

Below is the current sea temperature for Helsinki, Finland on 12th July 2025.

16.86° C

(62.35° F)

  • yesterday: 16.7° C (62.06° F)
  • a week ago: 12.72° C (54.9° F)

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

The average sea temperature for Helsinki on July 12th over the last 10 years is 16.25° C (61.25° F), with a low temperature of 14.09° C (57.36° F) and a high of 21.67° C (71.01° F).

Analysis and forecast for Helsinki water temperatures

The water temperature in Helsinki today is higher than the average temperature of 16.25° C (61.25° F) and the temperature on this day last year, 12th July 2024, was 17.07° C (62.73° F).

The chart and table below shows the change in water temperature in Helsinki over the last 30 days:

Date Temperature (Celsius) Temperature (Fahrenheit)
July 12 16.86° C 62.35° F
July 11 16.7° C 62.06° F
July 10 12.71° C 54.88° F
July 9 12.74° C 54.93° F
July 8 12.64° C 54.75° F
July 7 12.93° C 55.27° F
July 6 12.53° C 54.55° F
July 5 12.72° C 54.9° F
July 4 12.68° C 54.82° F
July 3 14.03° C 57.25° F
July 2 14.43° C 57.97° F
July 1 13.26° C 55.87° F
June 30 12.78° C 55° F
June 29 12.92° C 55.26° F
June 28 12.79° C 55.02° F
June 27 12.32° C 54.18° F
June 26 12.54° C 54.57° F
June 25 12.32° C 54.18° F
June 24 12.37° C 54.27° F
June 23 12.41° C 54.34° F
June 22 12.26° C 54.07° F
June 21 12.46° C 54.43° F
June 20 12.21° C 53.98° F
June 19 12.29° C 54.12° F
June 18 12.29° C 54.12° F
June 17 12.18° C 53.92° F
June 16 12.4° C 54.32° F
June 15 12.52° C 54.54° F
June 14 12.44° C 54.39° F
June 13 12.04° C 53.67° F
June 12 11.47° C 52.65° F

The actual nearshore temperatures may vary by several degrees and this can also be heavily affected by weather. Strong winds can cause cold, deep waters to replace the surface waters that had been warmed by the sun, and heavy rain can also reduce the temperature of the sea surface temperature as well.

Water temperature in Helsinki by month

The chart below shows the monthly average water temperature in Helsinki.

For more detailed information on how the sea temperature in Helsinki changes for each month of the year, choose from the months below.

January February March April May June July August September October November December

Helsinki map and nearby water temperatures

Locations near Helsinki

Teekkarikylae

Finland, Europe

3.70 miles away

Otaniemi

Finland, Europe

3.85 miles away

Koukkuniemi

Finland, Europe

6.10 miles away

Espoo

Finland, Europe

10.01 miles away

The highest temperature in Finland today is 18.62° C (65.52° F) in Imatra. The lowest is in Vaasa, where the temperature of the water is 14.66° C (58.39° F).

Why measure sea surface temperatures (SST) in Helsinki?

The ocean covers about 71% of the Earth's surface, and scientists record the sea surface temperature (SST) of locations such as Helsinki because they want to understand and learn how the ocean communicates with the atomosphere of Earth.

SST is one measure that provides information on the global climate, and it can be used to predict the weather in Helsinki as well as atmospheric model simulations and to study marine ecosystems in the area.

Data source and citation

Raw data for the calculations made to find the sea surface temperature in Helsinki comes from the National Oceanic and Atmospheric Administration (NOAA) and their 1/4° daily Optimum Interpolation Sea Surface Temperature.

The water temperature data is constructed by combining observations from different platforms (satellites, ships, buoys, and Argo floats) on a regular global grid. A spatially complete sea surface temperature map is then built by interpolating to fill in gaps in the data.

If you'd like to use any of the information above in the format it is presented, please use the citation tool below.

  • "Helsinki Sea Temperature". SeaTemperatures.net. Accessed on July 12, 2025. http://seatemperatures.net/europe/finland/helsinki/.

  • "Helsinki Sea Temperature". SeaTemperatures.net, http://seatemperatures.net/europe/finland/helsinki/. Accessed 12 July, 2025

  • Helsinki Sea Temperature. SeaTemperatures.net. Retrieved from http://seatemperatures.net/europe/finland/helsinki/.