Water temperature in Karasu

This data the coastal Karasu 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 Karasu

Water temperature in Karasu today is 23.2°C. Based on our historical data over a period of ten years, the warmest water in this day in Karasu was recorded in 2015 and was 23.6°C, and the coldest was recorded in 2009 at 21.4°C. Sea water temperature in Karasu is expected to drop to 21.2°C in the next 10 days. September average water temperature in Karasu is 23.7°C, the minimum temperature is 20.8°C, and the maximum is 26.6°C.

The swimming season in Karasu lasts from June to October. During those months, Karasu water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Karasu in winter reaches 9.6°C, in spring 11.6°C, in summer the average temperature rises to 24°C, and in autumn it is 19.7°C.

Karasu water temperature now

The sea salinity in Karasu is 17.95‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Karasu 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 Karasu. 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 Karasu. Data in table shown for 26 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Karasu

Karasu weather forecast

Current temperature and weather

Data in a table show Karasu temperature today (26 September 2025). For more information and forecast for a few days, go to the weather forecast Karasu.

0-3 h	3-6 h	6-9 h	9-12 h
9.1°C	8.4°C	9.3°C	18.5°C

12-15 h	15-18 h	18-21 h	21-24 h
21.4°C	18.8°C	11°C	8°C

Karasu water temperature by month

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

The nearest beaches and cities from Karasu 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
Izmit	21.6°C	19°C		2.37 m
Halidere	21.4°C	19°C		0.4 m
Sile	23.1°C	20°C		2.28 m
Karamursel	21.7°C	20°C		0.4 m
Tavsancil	21.7°C	20°C		0.4 m
Gebze	21.6°C	20°C		0.4 m
Diliskelesi	22°C	20°C		0.4 m
Altınova	22°C	20°C		0.4 m
Maltepe	21.8°C	20°C		0.57 m
Ataehir	21.9°C	20°C		0.48 m

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Our report for Karasu 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.