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Surf Forecasts:

Extensions surfForecast / Cape Town / South Africa

information circle48hr Weather and Surf, issued 7 am Wednesday 18 Mar 2026 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
18.5° C
 (Which is 1.0°C colder than average for this time of year)

How big are the waves at Extensions today?

The current surf forecast for Extensions at 1PM is: 1.4m 14s primary swell from a Southwest direction and 0.1m 11s secondary swell from a Northwest direction (forecast issued at 07:00am March 18). An open ocean swell of 1.7m 6s is not directed at the surf break. The wind direction is predicted to be cross-offshore.

Time (SAST) & DateWave HeightWave Period
Morning (18 Mar)4ft (1.2m)11s
Afternoon (18 Mar)4.5ft (1.4m)13s
Evening (18 Mar)5ft (1.5m)13s

Table - waves today at Extensions. (Swell directed towards the surf break)

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table
Wednesday
18
Thursday
19
Friday
20
Sat
21
5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM
Rating
(10 max)
1
0
0
0
0
0
1
4
2
2
1
0
0
4
0
0
2
2
2
0
2
1
3
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.2
SW
1.2
SW
1.4
SW
1.4
SW
1.4
SW
1.5
SSW
1.5
SSW
2
SSW
2.1
SSW
2.2
SSW
2.3
SSW
2.2
SSW
2.1
SSW
2.1
SSW
2.3
SSW
1.9
SSW
1.9
SSW
2.2
SSW
2.4
SSW
2.5
SSW
2.4
SSW
1.7
SSW
2.1
SSW
1.9
SSW
Period(s) (?)11111413131313161514141414141313131312912121212
Wave
Graph
(?)Metric surfscale
Energy kJ (?)341341822732700722711187520021983209319021748169918591170117015691677104415687971180980
Wind
(km/h)
30
SE
40
SE
40
ESE
45
SE
45
SE
45
ESE
40
ESE
20
E
15
NNW
20
N
30
NNW
35
NNW
35
NNW
10
W
20
WSW
20
WSW
15
WSW
20
SSW
20
SSW
20
SSW
25
SSW
20
S
20
SSE
25
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		offoffcross-
on		crosscrosscross-
on		cross-
on		oncross-
on		cross-
on		cross-
on		cross-
on		crosscross-
on		crosscrosscross-
off		cross-
off
High Tide
/ height (m)
3:07PM
1.54
3:22AM
1.70
3:41PM
1.58
3:54AM
1.74
4:15PM
1.58
Low Tide
/ height (m)
9:05AM
0.04
9:11PM
0.03
9:37AM
-0.03
9:43PM
0.00
10:11AM
-0.06
10:17PM
0.02
Wednesday
18
Thursday
19
Friday
20
Sat
21
Sunrise-6:47-------6:48-------6:48------
Sunset----7:00-------6:59-------6:58---
part cloud
clear
clear
clear
part cloud
cloud
cloud
cloud
rain showers
part cloud
cloud
cloud
cloud
rain showers
clear
clear
clear
rain showers
rain showers
part cloud
clear
clear
clear
clear
Rain (mm)
--------1----2---11-----
Temp. °C191919202020202018182020191919191918191918181919
Feels °C (?)161514141414151817161715141916161715161513141514
  • 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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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

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