Extensions surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 7 am Tuesday 16 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
18.8° C
(Which is normal for this time of year)


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 Tuesday (Dec 23) at 5AM. The primary swell is predicted to be 0.7m and 10s period with a secondary swell of 0.1m and 12s. 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 3.0m 14s and forecast to arrive on Tuesday (Dec 16) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.5m 8s period and expected on Sunday (Dec 21) at 5PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Tue 23rd Dec)2.5ft (0.7m) 10s
Best Surf 8AM (Tue 23rd Dec)7ft (2.1m) 7s
Most Powerful11PM (Tue 16th Dec)10ft (3.0m) 14s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Some drizzle, heaviest during Tue night. Warm (max 20°C on Tue morning, min 17°C on Wed morning). Winds increasing (light winds from the W on Tue morning, strong winds from the SE by Thu night).

Days 3-6 Weather Summary Mostly dry. Warm (max 22°C on Sun morning, min 17°C on Fri morning). Mainly gales.

Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
2
2
1
2
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
Swell
Height Map
Wave Height (m) & direction (?)
2.4
WSW
2.1
WSW
3
WSW
3
SW
1.9
WSW
1.3
WSW
1.6
SSW
1.4
SW
1.2
SW
1.1
SW
0.8
SW
1.6
SW
2.1
SSW
2.4
SSW
1.4
SSW
1.3
SW
1.1
SW
0.9
WSW
0.9
S
0.8
WSW
0.7
WSW
Period(s) (?)121214101212899101312131513121211101111
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1607132333861898110351934330424621319369413852445722503325197158151101
Wind
(km/h)
20
W
35
WNW
30
SSW
25
SSW
25
S
25
SE
30
SSE
40
SSE
40
SE
40
SSE
40
SSE
50
SE
50
SE
55
SE
55
ESE
55
SE
70
ESE
50
ESE
15
SE
25
SE
15
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
oncross-
on
crosscrosscrosscross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
offcross-
off
cross-
off
cross-
off
High Tide
/ height (m)
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
3:57AM
1.37
4:01PM
1.39
4:31AM
1.39
4:35PM
1.37
Low Tide
/ height (m)
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
9:46PM
0.18
10:00AM
0.30
10:17PM
0.18
10:34AM
0.31
10:49PM
0.19
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Sunrise5:28--5:28--5:28--5:28--5:28--5:30--5:30--
Sunset-7:53--7:54--7:54--7:55--7:57--7:57--7:58-
clear
part cloud
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
Rain (mm)
--1------------------
Temp. °C202020171718171817181819192020222221232221
Feels °C (?)18161712111212119121212111212131110232120
  • 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 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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