Extensions surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 7 pm Wednesday 10 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
18.7° 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 Thursday (Dec 11) at 8AM. The primary swell is predicted to be 1.3m and 10s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Extensions in the next 12 days are 4.0m 14s and forecast to arrive on Saturday (Dec 13) 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 1.7m 7s period and expected on Thursday (Dec 11) at 2AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Thu 11th Dec)4.5ft (1.3m) 10s
Best Surf 2AM (Sun 14th Dec)10ft (3.0m) 12s
Most Powerful 2AM (Sat 13th Dec)13ft (4.0m) 14s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 4mm), mostly falling on Fri morning. Warm (max 21°C on Wed night, min 17°C on Fri night). Winds decreasing (strong winds from the SE on Wed night, light winds from the SW by Thu morning).

Days 3-6 Weather Summary Mostly dry. Warm (max 21°C on Tue afternoon, min 16°C on Sun morning). Wind will be generally light.

Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wed
17
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
2
0
0
0
0
0
0
3
4
3
2
3
4
2
3
4
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1.3
SW
1.2
SW
1.2
SW
0.7
SW
1.6
SW
2
SW
4
SW
4
SW
3.5
SW
3
SW
2.5
SW
2.5
SW
2.5
SW
3
SW
3
SW
2.5
SW
2.2
SW
2.2
WSW
1.4
WSW
4
WSW
3.5
WSW
Period(s) (?)1099191716141313121212111212121212141312
Wave
Graph
(?)Metric surfscale
Energy kJ (?)3622582473761453198372415687436929681902164518132375225917691323126777845364022
Wind
(km/h)
30
ESE
10
SW
20
SW
25
NW
35
NW
40
W
35
WSW
20
WSW
20
SW
15
SE
15
S
20
SW
5
S
10
SSW
20
S
20
SSE
10
W
25
W
20
NNW
40
NNW
25
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
on
cross-
on
cross-
on
cross-
on
oncross-
on
cross-
on
cross-
on
cross-
off
crosscross-
on
crosscross-
on
crosscross-
off
ononcross-
on
cross-
on
on
High Tide
/ height (m)
8:15AM
1.26
8:45PM
1.04
9:21AM
1.21
10:04PM
1.01
10:28AM
1.20
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
Low Tide
/ height (m)
1:43AM
0.42
2:49PM
0.48
2:47AM
0.50
4:05PM
0.50
4:00AM
0.55
5:14PM
0.48
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
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wed
17
Sunrise-5:26--5:26--5:26--5:26--5:28--5:28--5:28-
Sunset--7:51--7:52--7:52--7:52--7:53--7:53--7:54
clear
clear
part cloud
part cloud
rain showers
light rain
rain showers
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
Rain (mm)
----112-------------1
Temp. °C211920201819181717171718192020202021201920
Feels °C (?)141818201213111213141415182119192119191314
  • 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

Latest Updates

submit an eyeball surf report

Quick surf report for Extensions:

join our community of surf reporters

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Extensions surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


false

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.

Nearest locationNearest
Nearest locationNearest
Nearest locationNearest