Sea temperature in South Africa
Live water temperatures and swimming conditions across 23 beaches on the South Africa coast.
Best time to swim in South Africa
The sea in South Africa peaks in February, when the water averages around 25°C.
The main swimming season runs from January – December, when surface temperatures stay comfortable for extended sessions.
On average, 12 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
The coldest month is typically July at around 20°C, when cold-water swimmers dominate the coast.
South Africa sits in the Southern Hemisphere, so the warmest sea coincides with the December–February summer and the coolest with July–August.
South Africa sea temperature history
Long-term climatology for South Africa shows an annual mean sea temperature of 22°C, ranging from 20°C in winter to 25°C at the summer peak.
The seasonal swing is roughly 5°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at South Africa, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Values are area averages; individual beaches vary by exposure and depth.
South Africa sea temperature: frequently asked questions
What is the warmest month to swim in South Africa?
February is the warmest month in South Africa, when the sea averages about 25°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in South Africa?
The coldest month in South Africa is typically July, when the water averages around 20°C. Cold-water swimmers and surfers dominate this period.
When can you swim in South Africa without a wetsuit?
The main swimming season in South Africa runs from January – December — about 12 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in South Africa?
Outside peak summer the water in South Africa drops toward 20°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in South Africa?
The long-term annual mean sea temperature in South Africa is about 22°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in South Africa?
The live reading at the top of this page shows the current sea temperature in South Africa, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
South Africa sea temperature by month
Average sea temperatures around South Africa for every month of the year, based on long-term Open-Meteo marine climatology.
| Month | Average sea | Swimming comfort |
|---|---|---|
| January | 24.0°C | Warm swimming |
| February ⭐ | 25.0°C | Warm swimming |
| March | 24.0°C | Warm swimming |
| April | 23.0°C | Pleasant swimming |
| May | 22.0°C | Pleasant swimming |
| June | 21.0°C | Pleasant swimming |
| July | 20.0°C | Swimmable, refreshing |
| August | 20.0°C | Swimmable, refreshing |
| September | 21.0°C | Pleasant swimming |
| October | 22.0°C | Pleasant swimming |
| November | 23.0°C | Pleasant swimming |
| December | 24.0°C | Warm swimming |
Monthly figures are modelled climatology averages, not live readings. How accurate is our data?
Warmest beaches in South Africa right now
| Beach | Region | Sea | Swim score |
|---|---|---|---|
| Durban North Beach | KwaZulu-Natal | 21.6°C | Excellent |
| Coffee Bay Beach | Eastern Cape | 21.5°C | Excellent |
| Llandudno Beach | Western Cape | 21.4°C | Excellent |
| Blouberg Beach | Western Cape | 21.4°C | Excellent |
| Plettenberg Bay | Western Cape | 21.3°C | Excellent |
| Jeffreys Bay | Eastern Cape | 21.3°C | Excellent |
| Clifton 2nd Beach | Western Cape | 21.3°C | Excellent |
| Muizenberg Beach | Western Cape | 20.8°C | Excellent |
| Sandy Bay | Western Cape | 20.7°C | Excellent |
| Umhlanga Beach | KwaZulu-Natal | 20.5°C | Excellent |
| Fish Hoek Beach | Western Cape | 20.3°C | Excellent |
| Robberg Beach | Garden Route | 19.6°C | Good |
| Boulders Beach | Western Cape | 19.4°C | Good |
| Ballito Beach | KwaZulu-Natal | 19.3°C | Good |
| Camps Bay | Western Cape | 19.2°C | Good |
| Lookout Beach | Garden Route | 19.2°C | Good |
| Central Beach Plett | Garden Route | 19.1°C | Good |
| Clifton 4th Beach | Western Cape | 18.9°C | Good |
| Salt Rock Beach | KwaZulu-Natal | 18.9°C | Good |
| Addington Beach | KwaZulu-Natal | 18.8°C | Good |
| Noordhoek Beach | Western Cape | 18.7°C | Good |
| Keurbooms Beach | Garden Route | 18.4°C | Good |
| Nature's Valley Beach | Garden Route | 18.4°C | Good |
Sea temperature in South Africa — FAQ
How warm is the sea in South Africa in September?
The sea off South Africa averages about 21.0°C in September, based on long-term monthly averages for this coast.
When is the best time to swim in South Africa?
South Africa is warmest in February (around 25.0°C) and coldest in July (around 20.0°C). There are typically 8 months a year when the water sits above 22°C.
What is the average yearly sea temperature in South Africa?
Across all twelve months, the sea in South Africa averages about 22.4°C.
Do you need a wetsuit to swim in South Africa?
In peak season (around February, ~25.0°C) most swimmers are comfortable without a wetsuit. Outside summer, when the water drops toward 20.0°C, a 3/2mm to 5/4mm wetsuit is recommended.
Which beach in South Africa has the warmest sea right now?
Durban North Beach typically has the warmest sea in September, while Camps Bay is the coolest of the featured beaches. Live readings for every beach are listed on this page.