Kosi Bay surfForecast / KZN North / South Africa

information circle12 Day Weather and Surf, issued 7 pm Saturday 13 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
25.9° 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 Monday (Dec 15) at 8AM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.6m and 6s. 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 3.0m 8s and forecast to arrive on Thursday (Dec 18) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Wednesday (Dec 17) at 2PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Mon 15th Dec)3.5ft (1.1m) 8s
Best Surf 8AM (Mon 15th Dec)3.5ft (1.1m) 8s
Most Powerful 5PM (Thu 18th Dec)10ft (3.0m) 8s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 32mm), heaviest during Sat night. Warm (max 28°C on Tue afternoon, min 21°C on Sun morning). Winds decreasing (fresh winds from the S on Sat night, calm by Mon morning).

Days 3-6 Weather Summary Light rain (total 5mm), mostly falling on Wed night. Warm (max 31°C on Wed morning, min 22°C on Wed night). Winds increasing (light winds from the WSW on Wed night, fresh winds from the S by Thu morning).

Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Sat
20
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1.9
S
2.1
S
1.5
E
1.5
ESE
1
E
1.1
E
1.1
E
1
E
1.5
ENE
1.4
E
1.1
E
1.1
E
1.6
ENE
1.9
S
3
S
2.5
SSE
2
SSE
0.9
SSW
1.7
ESE
1.2
S
1.1
S
Period(s) (?)679888888788768881491312
Wave
Graph
(?)Metric surfscale
Energy kJ (?)264478347280134152160135313167137163268272979712447346434459339
Wind
(km/h)
35
S
30
SSE
20
S
10
SSW
10
NE
20
NE
15
N
25
NNE
25
NE
15
N
30
NNE
25
NE
30
SSW
35
S
30
SSE
25
S
25
SSE
20
SE
10
SSE
20
SE
20
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
cross-
on
cross-
on
crosscrosscrosscross-
off
cross-
off
crosscross-
off
cross-
off
crosscrosscross-
on
cross-
on
cross-
on
cross-
on
oncross-
on
onon
High Tide
/ height (m)
11:13PM
1.40
11:58AM
1.55
12:30AM
1.46
12:57PM
1.62
1:24AM
1.55
1:43PM
1.70
2:07AM
1.65
2:22PM
1.79
2:43AM
1.75
2:57PM
1.86
3:17AM
1.83
3:30PM
1.92
3:49AM
1.89
4:02PM
1.97
Low Tide
/ height (m)
5:22AM
0.76
6:22PM
0.75
6:33AM
0.70
7:16PM
0.65
7:26AM
0.62
7:58PM
0.54
8:09AM
0.52
8:35PM
0.44
8:46AM
0.43
9:08PM
0.35
9:20AM
0.35
9:41PM
0.28
9:53AM
0.30
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Sat
20
Sunrise-4:48--4:48--4:48--4:48--4:48--4:50--4:50-
Sunset--6:37--6:37--6:37--6:38--6:38--6:39--6:39
heavy rain
heavy rain
light rain
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
thunderstorm
light rain
cloud
part cloud
cloud
part cloud
clear
clear
clear
Rain (mm)
18113---------41-------
Temp. °C232222222527242728253131272324232324222323
Feels °C (?)222021232727252627243030301920212022212220
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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