Water temperature in Hermanus

This data the coastal Hermanus 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 Hermanus

Water temperature in Hermanus today is 15.5°C. Based on our historical data over a period of ten years, the warmest water in this day in Hermanus was recorded in 2019 and was 16.6°C, and the coldest was recorded in 2011 at 14.9°C. Sea water temperature in Hermanus is expected to rise to 15.8°C in the next 10 days. September average water temperature in Hermanus is 15.2°C, the minimum temperature is 13.8°C, and the maximum is 17°C.

The swimming season in Hermanus lasts from January to February. During those months, Hermanus water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Hermanus in winter reaches 15.2°C, in spring 16°C, in summer the average temperature rises to 18.7°C, and in autumn it is 16.5°C.

Hermanus water temperature now

The sea salinity in Hermanus is 34.79‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Hermanus 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 Hermanus. 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 Hermanus. Data in table shown for 28 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Hermanus

Hermanus weather forecast

Current temperature and weather

Data in a table show Hermanus temperature today (28 September 2025). For more information and forecast for a few days, go to the weather forecast Hermanus.

0-3 h	3-6 h	6-9 h	9-12 h
14.2°C	13.6°C	13.6°C	16.4°C

12-15 h	15-18 h	18-21 h	21-24 h
18°C	18.6°C	16.7°C	15.2°C

Hermanus water temperature by month

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

The nearest beaches and cities from Hermanus 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
Grotto Beach	15.5°C	19°C		2.28 m
Onrus	15.5°C	19°C		2.48 m
Vermont	15.5°C	19°C		2.63 m
Gansbaai	15.5°C	19°C		2.64 m
Kleinmond	15.4°C	22°C		2.75 m
Franskraal	15.5°C	19°C		2.64 m
Betty's Bay	15.2°C	22°C		2.53 m
Pearly Beach	15.7°C	19°C		2.68 m
Pringle Bay	15°C	22°C		2.71 m
Kogel Bay	15.9°C	23°C		2.15 m

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Our report for Hermanus 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.