Water temperature in Port Saint Johns

This data the coastal Port Saint Johns 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 Port Saint Johns

Water temperature in Port Saint Johns today is 21.6°C. Based on our historical data over a period of ten years, the warmest water in this day in the Indian Ocean near Port Saint Johns was, like today, 21.6°C, and the coldest was recorded in 2024 at 19.9°C. Sea water temperature in Port Saint Johns is expected to drop to 20.9°C in the next 10 days. September average water temperature in Port Saint Johns is 20.8°C, the minimum temperature is 19.1°C, and the maximum is 22.4°C.

The swimming season in Port Saint Johns lasts from January to December, twelve months per year! During those months, Port Saint Johns water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Port Saint Johns in winter reaches 21.3°C, in spring 21.4°C, in summer the average temperature rises to 24.4°C, and in autumn it is 24.1°C.

Port Saint Johns water temperature now

The sea salinity in Port Saint Johns is 35.33‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Port Saint Johns 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 Port Saint Johns. 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 Port Saint Johns. 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 Port Saint Johns

Port Saint Johns weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
16.5°C	16°C	15°C	19.8°C

12-15 h	15-18 h	18-21 h	21-24 h
22.6°C	22.6°C	20.1°C	18°C

Port Saint Johns water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Port Saint Johns. 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 Port Saint Johns 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 Port Saint Johns

The nearest beaches and cities from Port Saint Johns 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
Coffee Bay	21°C	21°C		1.79 m
Port Edward	21.4°C	22°C		1.93 m
Margate	20.8°C	22°C		1.66 m
Port Shepstone	21.7°C	22°C		2.02 m
Scottburgh	21°C	23°C		2.02 m
Umkomaas	20.8°C	26°C		1.62 m
Aliwal Shoal	20.8°C	26°C		1.62 m
Gonubie	17.7°C	21°C		1.96 m
Amanzimtoti	20.7°C	25°C		2.03 m
Durban	20.8°C	26°C		1.88 m

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Our report for Port Saint Johns 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.