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Surf Forecasts:

Kosi Bay surfForecast / KZN North / South Africa

information circle12 Day Weather and Surf, issued 7 pm Wednesday 17 Sep 2025 SAST
Forecast update in hr  min  s Forecast update imminent
Kosi Bay surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Kosi Bay sea temperature is
23.3° C
 (Which is 1.1°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Kosi Bay this week:

The surf forecast for Kosi Bay over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 18) at 5AM. The primary swell is predicted to be 1.3m and 12s period with a secondary swell of 0.9m and 6s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Kosi Bay in the next 12 days are 2.0m 16s and forecast to arrive on Friday (Sep 19) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Sunday (Sep 21) at 5AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Thu 18th Sep)4.5ft (1.3m) 12s
Best Surf 5AM (Sat 20th Sep)5.5ft (1.7m) 14s
Most Powerful 2PM (Fri 19th Sep)6.5ft (2.0m) 16s

Table - best surf conditions forecast for Kosi Bay over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Light rain (total 3mm), mostly falling on Fri morning. Warm (max 24°C on Thu afternoon, min 20°C on Fri morning). Winds increasing (light winds from the ESE on Thu night, fresh winds from the NNE by Sat afternoon).

Days 3-6 Weather Summary Mostly dry. Warm (max 28°C on Mon afternoon, min 20°C on Tue afternoon). Winds increasing (calm on Sun night, fresh winds from the S by Mon night).

Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wed
24
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
2
3
1
3
0
1
3
2
0
1
0
0
1
1
0
0
0
0
1
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.3
S
0.9
SSW
1.2
S
1.1
S
1.7
S
2
S
1.5
S
1.4
S
1.3
S
1.1
S
1.6
ENE
1.7
ENE
1.7
ENE
1.7
ENE
1.7
ENE
1.6
ENE
2.3
S
1.7
S
1.3
S
1.3
SSE
1
E
Period(s) (?)12171217161614131312778877810101010
Wave
Graph
(?)Metric surfscale
Energy kJ (?)47748244467514741958894670569368284327318374320254649539313363186
Wind
(km/h)
10
ENE
20
NE
20
ENE
10
SSE
20
S
15
SE
15
NE
25
NNE
30
NE
30
NNE
30
N
25
NE
10
NE
30
NNE
30
NE
35
S
30
S
25
SE
10
S
15
SSE
20
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
off		crosscross-
on		cross-
on		oncrosscross-
off		crosscross-
off		cross-
off		crosscrosscross-
off		crosscross-
on		cross-
on		oncross-
on		onon
High Tide
/ height (m)
1:55AM
1.61
2:16PM
1.78
2:31AM
1.81
2:49PM
1.97
3:00AM
1.97
3:16PM
2.12
3:27AM
2.08
3:42PM
2.22
3:52AM
2.15
4:06PM
2.27
4:16AM
2.18
4:30PM
2.26
4:40AM
2.16
4:53PM
2.21
Low Tide
/ height (m)
8:01AM
0.54
8:25PM
0.46
8:34AM
0.34
8:55PM
0.30
9:03AM
0.19
9:22PM
0.17
9:30AM
0.08
9:48PM
0.08
9:55AM
0.02
10:13PM
0.04
10:20AM
0.00
10:37PM
0.04
10:44AM
0.03
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wed
24
Sunrise-5:43--5:41--5:41--5:39--5:37--5:37--5:35-
Sunset--5:42--5:43--5:43--5:43--5:44--5:44--5:45
part cloud
part cloud
clear
part cloud
light rain
cloud
rain showers
part cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
cloud
part cloud
part cloud
Rain (mm)
----1-2--------------
Temp. °C212324222122222424212426222728242222202322
Feels °C (?)192121222022222322192123242324221818192220
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for KZN North

  1. weather stationWind Update The wind is still cross-on at Kosi Bay (light winds from the E at Maputo/Lourenço Marques Airport 110 km from Kosi Bay). 2.3m 13s groundswell from the S to make surfable waves.

    2 hours 54 minutes ago Kosi Bay
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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.

View detailed surf forecast for Kosi Bay at:
surf-forecast.com

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 12 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.

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