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Surf Forecasts:

Extensions surfForecast / Cape Town / South Africa

information circle12 Day Weather and Surf, issued 1 am Friday 19 Sep 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
16.2° C
 (Which is slightly warmer than usual)

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 Friday (Sep 19) at 8PM. The primary swell is predicted to be 1.0m and 11s 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 2.2m 14s and forecast to arrive on Wednesday (Sep 24) 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 2.4m 7s period and expected on Thursday (Sep 25) at 8PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Fri 19th Sep)3.5ft (1.0m) 11s
Best Surf 8PM (Fri 19th Sep)3.5ft (1.0m) 11s
Most Powerful11AM (Wed 24th Sep)7ft (2.2m) 14s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Light rain (total 4mm), mostly falling on Sun night. Warm (max 20°C on Fri afternoon, min 13°C on Fri morning). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Mon morning. Very mild (max 15°C on Mon afternoon, min 12°C on Wed night). Winds increasing (calm on Tue morning, strong winds from the SE by Wed night).

Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
0
0
0
0
1
0
0
0
1
0
1
2
0
0
1
0
1
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.3
SSW
1.3
SSW
0.9
SSW
0.7
SSW
0.6
SSW
0.7
SW
0.5
SW
0.6
W
0.4
SW
0.8
S
0.6
SW
0.8
SW
1
WSW
1.4
WSW
1.1
SW
2.2
SW
2.1
SW
1.9
SW
1.6
SW
1.5
SW
1.3
SW
Period(s) (?)1210109988712111312121115141413121211
Wave
Graph
(?)Metric surfscale
Energy kJ (?)422320151715369313750146108184285423566189516371242772635403
Wind
(km/h)
25
ESE
25
ESE
15
NW
25
NW
25
WNW
5
SE
15
SE
20
SSE
20
WNW
10
WSW
15
S
10
S
5
WSW
40
S
45
SE
40
SE
45
SE
45
SE
40
SE
55
SE
40
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
on		cross-
on		oncross-
off		cross-
off		cross-
off		cross-
on		cross-
on		crosscrossoncrosscross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off
High Tide
/ height (m)
2:07PM
1.47
2:22AM
1.41
2:37PM
1.55
2:52AM
1.46
3:05PM
1.59
3:21AM
1.48
3:32PM
1.60
3:48AM
1.48
3:58PM
1.58
4:15AM
1.45
4:24PM
1.52
4:42AM
1.39
4:51PM
1.44
Low Tide
/ height (m)
8:23PM
0.18
8:29AM
0.15
8:53PM
0.11
8:57AM
0.11
9:21PM
0.08
9:24AM
0.10
9:47PM
0.07
9:50AM
0.12
10:13PM
0.10
10:16AM
0.17
10:38PM
0.15
10:41AM
0.23
11:03PM
0.23
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Sunrise6:39--6:39--6:37--6:35--6:35--6:33--6:31--
Sunset-6:39--6:39--6:40--6:42--6:42--6:43--6:44-
clear
cloud
part cloud
clear
clear
clear
cloud
part cloud
rain showers
rain showers
rain showers
clear
part cloud
cloud
part cloud
clear
clear
clear
clear
clear
clear
Rain (mm)
--------411----------
Temp. °C142020161615141516141514141514141313131414
Feels °C (?)9161812121310121312131112125544553
  • 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

Eyeball surf reportRecent Eyeball Surf Reports for Cape Town

  1. weather stationWind Update The wind is still cross-on at Extensions (light winds from the SSW at Slangkop 25 km from Extensions). 1.8m 10s swell from the SSW to make surfable waves.

    1 hour 33 minutes ago Extensions
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25 km away, 1 h 33 min ago

13 km/h
SSW
0.0
16.2
Air / Water (°C)
Please reload the page to see if there are any updates.

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.

View detailed surf forecast for Extensions at:
surf-forecast.com

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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