Water temperature in Cape Town in September

Is it warm enough to swim in Cape Town in September? Average water temperature in Cape Town in September is 16.2°C and therefore is not suitable for comfortable swimming. The warmest sea in Cape Town in September is 18.5°C, and the coldest is 14.4°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Cape Town

Changes water temperature in Cape Town in September 2025, 2024

To get an accurate forecast for the water temperature in Cape Town for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Cape Town, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.

Sea temperature

Tides

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 September	15.9°C	14.8°C	14.8°C	17.6°C
2 September	16.5°C	15.1°C	15.1°C	17.8°C
3 September	16.2°C	14.9°C	14.9°C	17.8°C
4 September	16.2°C	14.8°C	14.8°C	17.6°C
5 September	16.1°C	14.6°C	14.6°C	17.6°C
6 September	16.2°C	14.6°C	14.6°C	17°C
7 September	16°C	14.6°C	14.6°C	17.6°C
8 September	15.9°C	14.4°C	14.4°C	17.2°C
9 September	15.8°C	14.5°C	14.5°C	17°C
10 September	15.9°C	14.8°C	14.8°C	17.3°C
11 September	16.2°C	14.8°C	14.8°C	17°C
12 September	16°C	14.8°C	14.8°C	16.9°C
13 September	16.3°C	14.4°C	14.4°C	16.8°C
14 September	16.3°C	14.8°C	14.8°C	16.8°C
15 September	16.4°C	14.8°C	14.8°C	17.1°C

Day	2025	2024	Min	Max
16 September	16.4°C	14.9°C	14.9°C	17.4°C
17 September	16.3°C	14.9°C	14.9°C	17.4°C
18 September	16.2°C	14.9°C	14.9°C	17.5°C
19 September	16.1°C	14.8°C	14.8°C	17.4°C
20 September	16.4°C	15.1°C	15.1°C	17.4°C
21 September	16.4°C	15.1°C	15.1°C	17.5°C
22 September	16.2°C	15°C	15°C	17.3°C
23 September	16°C	15.3°C	15.3°C	17.7°C
24 September	15.4°C	15.3°C	15.3°C	17.4°C
25 September	15°C	15°C	15°C	17.5°C
26 September	14.3°C	15.2°C	14.3°C	17.9°C
27 September	15.6°C	15.1°C	15.1°C	18.3°C
28 September	16.4°C	14.8°C	14.8°C	18.5°C
29 September		14.7°C	14.7°C	17.6°C
30 September		14.7°C	14.7°C	18.4°C

Average water temperature in Cape Town in September over a decade

2015	2016	2017	2018	2019
15.6°C	16.8°C	16.4°C	15.7°C	17.1°C

2020	2021	2022	2023	2024
16.3°C	15.8°C	16.5°C	16.2°C	14.8°C

Cape Town sea state in September

Chart comparing the height of waves in Cape Town in September over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Cape Town water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Temperature in neighboring cities

The nearest locations with the average water temperature in September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

	Avr	Min	Max
Robben Island	14.3°C	10.6°C	16.4°C
Yzerfontein	14.3°C	11.3°C	16.1°C
Grotto Bay	14.3°C	10.8°C	16.2°C
Oudekraal Beach	14.4°C	8.1°C	16.5°C
Hout Bay	14.4°C	8.6°C	16.5°C
Llandudno	14.4°C	8.6°C	16.5°C
Sea Point	14.3°C	9°C	16.6°C
Camps Bay	14.3°C	8.5°C	17.1°C
Clifton	14.3°C	8.5°C	17.1°C
Bakoven	14.3°C	8.5°C	17.1°C

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Our report for Cape Town 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.

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Date (day and month)

Water temperature: min 16°C

Average temperature Maximum temperature