Extensions surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 7 am Sunday 28 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
19.1° 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 Monday (Dec 29) at 11PM. The primary swell is predicted to be 0.6m and 9s period with a secondary swell of 0.2m and 12s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Extensions in the next 12 days are 2.2m 15s and forecast to arrive on Saturday (Jan 03) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 7s period and expected on Sunday (Dec 28) at 8PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+)11PM (Mon 29th Dec)2ft (0.6m) 9s
Best Surf 2PM (Tue 30th Dec)3.5ft (1.0m) 11s
Most Powerful11AM (Sat 3rd Jan)7ft (2.2m) 15s

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 25°C on Mon night, min 18°C on Sun morning). Winds decreasing (near gales from the SE on Sun night, calm by Mon night).

Days 3-6 Weather Summary Mostly dry. Warm (max 23°C on Wed morning, min 20°C on Wed night). Winds increasing (light winds from the SSW on Fri morning, fresh winds from the SE by Fri night).

Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Thursday
01
Friday
02
Saturday
03
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
1
2
1
0
0
0
0
1
0
0
2
2
1
1
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.9
SW
0.9
SW
0.7
SW
0.6
SW
0.6
WSW
0.6
WSW
0.9
WSW
0.9
WSW
0.9
WSW
0.9
SW
1.1
SW
1
SW
1
SW
1.4
SW
1.2
SW
1.1
SW
0.9
WSW
1.7
WSW
2.2
WSW
1.9
WSW
1.6
WSW
Period(s) (?)101010999111110111010131212121816151413
Wave
Graph
(?)Metric surfscale
Energy kJ (?)16316092675453186198163202240204325567421319565140820151463888
Wind
(km/h)
45
SE
55
SE
50
ESE
15
SE
30
SE
5
ESE
10
SW
20
SSE
25
SE
25
S
30
S
30
SSE
25
SSE
30
S
20
S
15
SSW
20
SSE
35
SE
40
SSE
50
SE
50
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
offcross-
on
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
crosscrosscross-
on
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
High Tide
/ height (m)
9:02AM
1.30
9:49PM
1.09
10:15AM
1.30
11:11PM
1.13
11:29AM
1.34
12:23AM
1.21
12:37PM
1.41
1:24AM
1.31
1:36PM
1.48
2:16AM
1.42
2:29PM
1.54
3:04AM
1.50
3:18PM
1.57
3:50AM
1.56
Low Tide
/ height (m)
3:38PM
0.41
3:42AM
0.47
4:57PM
0.36
5:05AM
0.46
6:09PM
0.28
6:22AM
0.39
7:11PM
0.19
7:26AM
0.30
8:04PM
0.10
8:22AM
0.21
8:53PM
0.04
9:12AM
0.14
9:37PM
0.01
Sunday
28
Monday
29
Tuesday
30
Wednesday
31
Thursday
01
Friday
02
Saturday
03
Sunrise5:33--5:33--5:35--5:35--5:37--5:37--5:37--
Sunset-8:00--8:00--8:00--8:00--8:00--8:00--8:00-
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
part cloud
clear
part cloud
clear
clear
clear
part cloud
Rain (mm)
---------------------
Temp. °C202020222125202123232221202121212121202020
Feels °C (?)141311211822222122231918181920222019161413
  • 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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