Water temperature in Cat Ba

This data the coastal Cat Ba 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 Cat Ba

Water temperature in Cat Ba today is 29.7°C. Based on our historical data over a period of ten years, the warmest water in this day in the Gulf Of Tonkin near Cat Ba was recorded in 2015 and was 30.4°C, and the coldest was recorded in 2011 at 27.7°C. Sea water temperature in Cat Ba is expected to drop to 29°C in the next 10 days. September average water temperature in Cat Ba is 29.8°C, the minimum temperature is 27.5°C, and the maximum is 31.9°C.

The swimming season in Cat Ba lasts from January to December, twelve months per year! During those months, Cat Ba water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Cat Ba in winter reaches 20.2°C, in spring 24.2°C, in summer the average temperature rises to 30.2°C, and in autumn it is 27.7°C.

Cat Ba water temperature now

The sea salinity in Cat Ba is 32.14‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Cat Ba 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 Cat Ba. 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 Cat Ba. 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 Cat Ba

Cat Ba weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
24.7°C	23.9°C	24.4°C	26.9°C

12-15 h	15-18 h	18-21 h	21-24 h
27.3°C	25.8°C	25.6°C	26.4°C

Cat Ba water temperature by month

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

The nearest beaches and cities from Cat Ba 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
Tra Co Beach	29.6°C	26°C		0.83 m
Fangcheng	29.7°C	26°C		0.81 m
Fangchenggang	29.7°C	26°C		0.81 m
Changhua	28.8°C	28°C		0.56 m
Beihai	29.5°C	29°C		0.36 m
Eman	29.3°C	27°C		0.64 m
Baimajing	29.1°C	26°C		0.52 m
Paipu	29.1°C	26°C		0.52 m
Guangcun	29.4°C	27°C		0.5 m
Tiaolou	29.4°C	27°C		0.41 m

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Cat Ba Island

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Our report for Cat Ba 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.