Water temperature in Merimasku

This data the coastal Merimasku 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 Merimasku

Water temperature in Merimasku today is 16.9°C. Based on our historical data over a period of ten years, the warmest water in this day in Merimasku was recorded in 2018 and was 18.4°C, and the coldest was recorded in 2022 at 14.1°C. Sea water temperature in Merimasku is expected to drop to 14.3°C in the next 10 days. September average water temperature in Merimasku is 14.7°C, the minimum temperature is 11.1°C, and the maximum is 19.7°C.

The swimming season in Merimasku lasts only one month - July. During this month, Merimasku water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Merimasku in winter reaches 0.7°C, in spring 3.3°C, in summer the average temperature rises to 16.4°C, and in autumn it is 10.2°C.

Merimasku water temperature now

The sea salinity in Merimasku is 5.89‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Merimasku 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 Merimasku. 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 Merimasku. Data in table shown for 7 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Merimasku

Merimasku weather forecast

Current temperature and weather

Data in a table show Merimasku temperature today (7 September 2025). For more information and forecast for a few days, go to the weather forecast Merimasku.

0-3 h	3-6 h	6-9 h	9-12 h
16.6°C	16.3°C	15.9°C	18.3°C

12-15 h	15-18 h	18-21 h	21-24 h
20.5°C	20.4°C	18°C	15.6°C

Merimasku water temperature by month

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

The nearest beaches and cities from Merimasku 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
Naantali	17.1°C	20°C		0.04 m
Velkua	16.7°C	17°C		0.06 m
Rymattyla	16.9°C	20°C		0.04 m
Pargas	16.8°C	20°C		0.03 m
Nagu	17°C	20°C		0.07 m
Uusikaupunki	17.3°C	17°C		0.05 m
Pyharanta	16.6°C	17°C		0.05 m
Rauma	15.3°C	19°C		0.08 m
Hanko	16.4°C	17°C		0.11 m
Turku	16.1°C	17°C		0.21 m

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Our report for Merimasku 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.