Kosi Bay surfForecast / KZN North / South Africa

information circle12 Day Weather and Surf, issued 7 pm Thursday 18 Dec 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
26.4° C
(Which is slightly warmer than usual)


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 Saturday (Dec 20) at 2AM. The primary swell is predicted to be 1.5m and 8s period with a secondary swell of 1.0m and 12s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Kosi Bay in the next 12 days are 1.8m 10s and forecast to arrive on Wednesday (Dec 24) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Sat 20th Dec)5ft (1.5m) 8s
Best Surf 2AM (Sat 20th Dec)5ft (1.5m) 8s
Most Powerful11PM (Wed 24th Dec)6ft (1.8m) 10s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 8mm), mostly falling on Sat night. Warm (max 26°C on Sat afternoon, min 23°C on Thu night). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 9mm), mostly falling on Mon night. Warm (max 27°C on Tue afternoon, min 23°C on Mon night). Wind will be generally light.

Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thu
25
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
3
1
0
0
0
0
0
0
0
1
2
0
3
2
0
3
0
0
Swell
Height Map
Wave Height (m) & direction (?)
2.1
SE
1.7
ESE
1.4
E
1.5
E
1
S
1.3
E
0.6
S
0.9
SSW
0.7
SSW
1.1
E
1.3
ESE
0.7
S
1.7
E
1.5
E
1.4
E
1.7
ESE
1.7
ESE
1.7
ESE
1.8
ESE
1.7
ESE
1.6
ESE
Period(s) (?)888812818161567147889991099
Wave
Graph
(?)Metric surfscale
Energy kJ (?)50534724528627319622542122289176199298272252474485495575487409
Wind
(km/h)
25
SE
15
SE
15
E
5
NE
10
SE
20
ENE
15
E
20
E
20
E
10
E
10
E
20
E
10
NE
15
NNE
20
ENE
10
NNE
15
NE
15
ENE
5
ENE
25
S
25
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
ononcross-
on
glassoncross-
on
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
crosscross-
off
crosscross-
off
crosscross-
on
glasscross-
on
cross-
on
High Tide
/ height (m)
3:17AM
1.83
3:30PM
1.92
3:49AM
1.89
4:02PM
1.97
4:21AM
1.94
4:33PM
1.99
4:54AM
1.96
5:05PM
1.99
5:27AM
1.96
5:37PM
1.96
6:01AM
1.94
6:11PM
1.90
6:38AM
1.90
6:48PM
1.82
Low Tide
/ height (m)
9:08PM
0.35
9:20AM
0.35
9:41PM
0.28
9:53AM
0.30
10:12PM
0.24
10:25AM
0.28
10:44PM
0.21
10:57AM
0.28
11:15PM
0.22
11:30AM
0.31
11:48PM
0.25
12:06PM
0.37
12:23AM
0.30
12:44PM
0.44
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thu
25
Sunrise-4:50--4:50--4:50--4:50--4:52--4:52--4:52-
Sunset--6:39--6:39--6:40--6:40--6:42--6:42--6:43
rain showers
part cloud
clear
rain showers
clear
clear
thunderstorm
thunderstorm
cloud
cloud
part cloud
part cloud
rain showers
rain showers
clear
rain showers
thunderstorm
clear
part cloud
thunderstorm
rain showers
Rain (mm)
2--1--41----32-22--31
Temp. °C232425242526252525242525242627252727252524
Feels °C (?)222425262727262525232525242727262828272824
  • 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

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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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