Surf Forecasts:
Kosi Bay surf forecast from 17 Sep 2026:
- Best quality surf: Monday 21 Sep, 2AM (local time) - 4.5ft (1.4m), 8s period, ESE swell with offshore winds.
- Most powerful swell: Friday 18 Sep, 11PM (local time) - 10ft (3.0m), 10s period, SSE swell with 1,845 kJ wave energy.
- Next surfable swell (1★+): Monday 21 Sep, 2AM (local time) - 4.5ft (1.4m), 8s period with ESE swell.
Best Forecast Surf Conditions for Kosi Bay this week:
The surf forecast for Kosi Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 21) at 2AM. The primary swell is predicted to be 1.4m and 8s period with a secondary swell of 0.2m and 18s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Kosi Bay in the next 16 days are 3.0m 10s and forecast to arrive on Friday (Sep 18) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Wednesday (Sep 23) at 2PM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 21st Sep) | 4.5ft (1.4m) 8s |
| Best Surf | 2AM (Mon 21st Sep) | 4.5ft (1.4m) 8s |
| Most Powerful | 11PM (Fri 18th Sep) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Kosi Bay over the next 16 days.
Short Range ForecastModerate rain (total 18mm), heaviest on Sat afternoon. Warm (max 22°C on Sun morning, min 18°C on Thu night). Winds decreasing (fresh winds from the SSW on Fri afternoon, light winds from the E by Sat night). | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Mon morning, min 20°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | S 7 | S 9 | S 9 | SSE 10 | SE 9 | SE 9 | SE 8 | SE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | ESE 8 | E 9 | E 8 | E 8 | E 8 | E 8 | E 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 179 | 1138 | 1779 | 1611 | 1012 | 645 | 358 | 239 | 323 | 268 | 246 | 199 | 176 | 210 | 177 | 302 | 182 | 142 | 186 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | off | cross | cross | cross | cross | cross | cross-off | cross-off | cross | cross-off |
High Tide | 6:47AM1.56m | 7:02PM1.48m | 7:19AM1.35m | 7:46PM1.27m | 10:06AM1.17m | 00:39AM1.25m | 1:23PM1.36m | 1:34AM1.45m | 1:55PM1.58m | 2:04AM1.66m | 2:21PM1.80m | 2:31AM1.85m | |||||||
Low Tide | 00:45AM0.60m | 12:55PM0.69m | 1:15AM0.80m | 1:31PM0.90m | 2:29AM1.00m | 5:56PM1.03m | 7:03AM0.91m | 7:29PM0.84m | 7:42AM0.70m | 8:00PM0.64m | 8:09AM0.50m | 8:27PM0.44m | |||||||
 |  |  |  |  | | | |  | | | |  | | | | | | | |
 | — | 5:43 | — | — | 5:41 | — | — | 5:41 | — | — | 5:39 | — | — | 5:37 | — | — | 5:37 | — | — |
 | 5:42 | — | 5:42 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:44 | — | — | 5:44 | — |
mm | — | — | — | 4 | 3 | 5 | 5 | 1 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 20 | 21 | 20 | 21 | 21 | 21 | 22 | 22 | 21 | 23 | 23 | 21 | 23 | 23 | 21 | 23 | 23 | 22 |
Feels °C | 17 | 17 | 16 | 16 | 20 | 21 | 21 | 23 | 22 | 22 | 23 | 22 | 21 | 22 | 21 | 20 | 20 | 20 | 21 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 9 | E 8 | SE 9 | SE 8 | SE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | ESE 8 | E 9 | E 8 | E 8 | E 8 | E 8 | E 8 |
| kJ | 168 | 127 | 101 | 74 | 47 | 645 | 358 | 239 | 323 | 268 | 246 | 199 | 176 | 210 | 177 | 302 | 182 | 142 | 186 |
Swell 2 Height (m) Direction Period (s) | S 17 | S 16 | — | — | S 16 | E 8 | E 8 | E 8 | S 10 | SSW 18 | SSW 15 | SSW 13 | S 10 | S 9 | S 16 | S 15 | S 16 | S 16 | NE 5 |
| kJ | 6 | 20 | — | — | 19 | 45 | 68 | 90 | 8 | 30 | 75 | 35 | 8 | 6 | 21 | 17 | 20 | 19 | 27 |
Swell 3 Height (m) Direction Period (s) | S 13 | — | — | — | NE 8 | SSW 16 | SSW 15 | S 10 | NE 8 | S 9 | — | S 10 | S 16 | S 18 | S 8 | S 10 | S 10 | S 18 | S 16 |
| kJ | 4 | — | — | — | 3 | 25 | 21 | 8 | 2 | 2 | — | 8 | 5 | 6 | 1 | 2 | 2 | 6 | 75 |
Wind waves Height (m) Direction Period (s) | S 7 | S 9 | S 9 | SSE 10 | SE 9 | — | — | — | — | — | — | ENE 8 | ENE 5 | — | NE 4 | — | NNE 4 | NE 5 | — |
| kJ | 179 | 1138 | 1779 | 1611 | 1012 | — | — | — | — | — | — | 75 | 19 | — | 10 | — | 46 | 51 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 407 | 350 | 1252 | 337 | 380 | 380 | 173 | 380 | 380 | 0 | 380 | 380 | 229 | 1061 | 1077 | 696 | 407 | 360 | 0 |
Best forecast wave conditions in KwaZulu-Natal North Coast | |||||||||||||||||||
Best forecast wave conditions in South Africa | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Kosi Bay surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Kosi Bay Surf forecast
The above surf forecast table for Kosi Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kosi Bay can be found by selecting the local surf guide option on the grey menu. Our Kosi Bay surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Kosi Bay) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Kosi Bay may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Kosi Bay is 108 km (67 miles) from the city of Maputo. If you plan a holiday in KwaZulu-Natal North Coast, look for hotels and other accommodation in Maputo. Maputo has rooms for a wide range of budgets as well as car hire and transport links.
Nearest