Kosi Bay surfForecast / KZN North / South Africa

information circle12 Day Weather and Surf, issued 7 pm Wednesday 17 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
26.1° 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 1.1m and 12s period with a secondary swell of 1.4m and 9s. 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 Thursday (Dec 25) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 6s period and expected on Thursday (Dec 18) at 2AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Sat 20th Dec)3.5ft (1.1m) 12s
Best Surf 2AM (Sat 20th Dec)3.5ft (1.1m) 12s
Most Powerful 2AM (Thu 25th 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 Heavy rain (total 20mm), heaviest during Wed night. Warm (max 26°C on Sat morning, min 22°C on Wed night). Winds decreasing (fresh winds from the S on Wed night, calm by Fri night).

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

Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wed
24
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
0
3
2
0
0
0
0
0
0
0
3
2
2
3
1
2
Swell
Height Map
Wave Height (m) & direction (?)
2
S
2.1
S
2.2
SSE
1.6
SSE
1.2
E
0.9
S
1.1
S
1.1
S
1
S
0.8
S
1
S
0.8
SSW
0.6
S
1.4
ESE
1.4
ESE
1.6
ESE
1.8
ESE
1.7
ESE
1.8
ESE
1.7
ESE
1.8
ESE
Period(s) (?)67878121212111116151478888999
Wave
Graph
(?)Metric surfscale
Energy kJ (?)302465540268200240342336244149555308132193215359434432521477563
Wind
(km/h)
35
S
25
S
30
SSE
25
SE
15
ESE
15
E
0
NNW
10
E
25
ENE
20
ESE
15
ESE
20
ESE
10
ESE
10
ESE
15
E
5
NNE
15
NE
20
NNE
15
N
15
NE
10
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
cross-
on
cross-
on
ononcross-
on
glasscross-
on
cross-
on
cross-
on
cross-
on
ononcross-
on
cross-
on
cross-
off
crosscross-
off
cross-
off
crosscross-
on
High Tide
/ height (m)
2:43AM
1.75
2:57PM
1.86
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
Low Tide
/ height (m)
8:35PM
0.44
8:46AM
0.43
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
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wed
24
Sunrise-4:48--4:50--4:50--4:50--4:50--4:52--4:52-
Sunset--6:38--6:39--6:39--6:40--6:40--6:42--6:42
thunderstorm
rain showers
light rain
rain showers
part cloud
part cloud
part cloud
part cloud
clear
thunderstorm
cloud
cloud
cloud
part cloud
part cloud
rain showers
part cloud
part cloud
clear
part cloud
rain showers
Rain (mm)
15221-----1-----2----1
Temp. °C242423232424242626252524242525242727252726
Feels °C (?)232422212424252826252524232525252827262727
  • 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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