Water temperature in Knysna

This data the coastal Knysna 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 Knysna

Water temperature in Knysna today is 17.8°C. Based on our historical data over a period of ten years, the warmest water in this day in the Indian Ocean near Knysna was recorded in 2019 and was 17.9°C, and the coldest 15.4°C. Sea water temperature in Knysna is expected to drop to 16.6°C in the next 10 days. September average water temperature in Knysna is 16.5°C, the minimum temperature is 13.7°C, and the maximum is 18.8°C.

The swimming season in Knysna lasts from December to March. During those months, Knysna water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Knysna in winter reaches 16.5°C, in spring 17.3°C, in summer the average temperature rises to 20.7°C, and in autumn it is 18.3°C.

Knysna water temperature now

The sea salinity in Knysna is 35.00‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Knysna 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 Knysna. 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 Knysna. Data in table shown for 10 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Knysna

Knysna weather forecast

Current temperature and weather

Data in a table show Knysna temperature today (10 September 2025). For more information and forecast for a few days, go to the weather forecast Knysna.

0-3 h	3-6 h	6-9 h	9-12 h
17°C	15.9°C	15.5°C	20.3°C

12-15 h	15-18 h	18-21 h	21-24 h
21.9°C	21.3°C	17.7°C	16.3°C

Knysna water temperature by month

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

The nearest beaches and cities from Knysna 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
Buffelsbaai	17.7°C	21°C		1.55 m
Sedgefield	18.2°C	20°C		1.41 m
Wilderness	17.8°C	20°C		1.41 m
Victoria Bay	17.9°C	20°C		1.38 m
George	18°C	20°C		1.39 m
Hartenbos	17.7°C	19°C		1.33 m
Stilbaai	16.8°C	22°C		1.17 m
Cape Saint Francis	18°C	24°C		1.64 m
St Francis Bay	18.1°C	24°C		1.19 m
Witsand	17.1°C	21°C		0.77 m

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Our report for Knysna 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.