Extensions surfForecast / Cape Town / 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
Extensions surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Extensions sea temperature is
18.6° C
(Which is slightly cooler than normal)


Best Forecast Surf Conditions for Extensions this week:

The surf forecast for Extensions over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Dec 14) at 2AM. The primary swell is predicted to be 3.0m and 12s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Extensions in the next 12 days are 3.5m 14s and forecast to arrive on Wednesday (Dec 17) 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 2.4m 6s period and expected on Friday (Dec 19) at 8PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Sun 14th Dec)10ft (3.0m) 12s
Best Surf 2AM (Sun 14th Dec)10ft (3.0m) 12s
Most Powerful 2AM (Wed 17th Dec)11ft (3.5m) 14s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Warm (max 20°C on Mon afternoon, min 16°C on Sat night). Winds increasing (light winds from the SSE on Mon morning, strong winds from the NW by Tue afternoon).

Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Tue night. Very mild (max 19°C on Tue night, min 17°C on Wed morning). Winds decreasing (strong winds from the SW on Tue night, light 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)
4
3
3
3
4
2
3
0
0
0
0
0
3
2
1
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
3
SW
2.5
SW
2.3
SW
2.5
SW
3
SW
3
SW
2.5
SW
2.4
SW
2.5
WSW
3.5
WSW
3
WSW
2.4
WSW
2.5
SSW
1.5
SW
1.7
SW
1.3
SW
0.8
SW
0.8
SW
1.1
SW
1.1
SW
2
SSW
Period(s) (?)121212111212121215141112109991312121113
Wave
Graph
(?)Metric surfscale
Energy kJ (?)27351775139817562149218520441711319850502349148714223344602552121843432861309
Wind
(km/h)
10
SSE
10
S
15
S
20
SE
10
SSE
20
SSW
20
SE
25
NW
40
NW
35
WSW
35
SW
30
SSW
15
SW
15
S
25
S
30
SE
30
SSE
40
SSE
50
SE
50
SE
60
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
crosscrosscross-
off
cross-
off
crosscross-
off
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
crosscrosscross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
High Tide
/ height (m)
11:17PM
1.03
11:28AM
1.20
12:15AM
1.08
12:18PM
1.23
1:01AM
1.15
1:02PM
1.27
1:40AM
1.21
1:41PM
1.31
2:15AM
1.27
2:18PM
1.35
2:50AM
1.32
2:53PM
1.38
3:24AM
1.35
3:28PM
1.39
Low Tide
/ height (m)
5:11AM
0.56
6:10PM
0.43
6:11AM
0.53
6:54PM
0.37
6:59AM
0.48
7:32PM
0.32
7:40AM
0.43
8:07PM
0.27
8:17AM
0.38
8:41PM
0.23
8:52AM
0.34
9:14PM
0.20
9:26AM
0.31
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Sat
20
Sunrise-5:26--5:28--5:28--5:28--5:28--5:28--5:28-
Sunset--7:52--7:53--7:53--7:54--7:54--7:55--7:57
clear
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
---------2-----------
Temp. °C181618181820202020191717181919181819192120
Feels °C (?)141416161717181715131011151716141314131311
  • 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 Extensions Surf forecast

The above surf forecast table for Extensions provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Extensions can be found by selecting the local surf guide option on the grey menu. Our Extensions 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 (Extensions) 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 Extensions 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.

Are you planning a holiday in Cape Town? If you are looking for accommodation near Extensions, camping, hotels and holiday cottages in Cape Town, consider staying in Cape Town which is 45 km (28 miles) away. Other places in and around Cape Town where you can find information about places to rent, and car hire include Bellville which is 51 km (32 miles) away, Grabouw, Stellenbosch and Kayamnandi.

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