Extensions surfForecast / Cape Town / South Africa

information circle48hr Weather and Surf, issued 7 am Monday 18 May 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
16.7° C
(Which is slightly cooler than normal)

How big are the waves at Extensions today?

The current surf forecast for Extensions at 12PM is: 1.7m 14s primary swell from a West-southwest direction (forecast issued at 07:00am May 18). An open ocean swell of 2.1m 6s is not directed at the surf break. The wind direction is predicted to be cross-offshore.

Time (SAST) & DateWave HeightWave Period
Morning (18 May)5.5ft (1.7m)14s
Afternoon (18 May)5ft (1.6m)14s
Evening (18 May)5ft (1.5m)13s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Warm (max 20°C on Wed afternoon, min 16°C on Mon morning). Winds decreasing (near gales from the ESE on Mon night, light winds from the N by Wed night).

Monday
18
Tuesday
19
Wednesday
20
Thu
21
5 AM
8 AM
11 AM
2 PM
5 PM
8 PM
11 PM
2 AM
5 AM
8 AM
11 AM
2 PM
5 PM
8 PM
11 PM
2 AM
5 AM
8 AM
11 AM
2 PM
5 PM
8 PM
11 PM
2 AM
Rating
(10 max)
1
1
1
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
1
1
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
1.7
WSW
13
1.7
WSW
14
1.7
WSW
14
1.6
WSW
14
1.7
WSW
13
1.5
WSW
13
1.5
WSW
13
1.5
WSW
13
1.3
WSW
13
1.3
WSW
13
1.3
WSW
13
1.3
WSW
13
1.2
WSW
13
1.1
WSW
13
1
WSW
12
0.9
WSW
12
0.9
WSW
12
0.8
WSW
12
0.8
WSW
12
0.7
WSW
12
0.7
WSW
12
0.6
WSW
11
0.5
WSW
11
0.6
SW
14
Wave Graph
Metric surfscale
Energy kJ
1018
1053
1244
999
975
796
772
745
624
536
528
520
451
402
325
260
226
184
180
123
119
82
68
119
Wind (km/h)
40
SE
40
SE
45
SE
50
SE
55
SE
60
ESE
55
ESE
60
ESE
60
ESE
55
SE
45
ESE
30
ESE
50
ESE
55
ESE
50
SE
35
ESE
30
ESE
30
ESE
30
ESE
25
ESE
25
SE
15
E
10
ESE
10
ESE
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
off
off
cross-off
off
cross-off
off
off
cross-off
High Tide
4:28PM1.51m
4:43AM1.54m
5:17PM1.46m
5:34AM1.43m
6:11PM1.39m
Low Tide
10:16AM-0.00m
10:34PM0.14m
11:03AM0.08m
11:26PM0.22m
11:53AM0.18m
00:24AM0.31m
clear
part cloud
cloud
cloud
cloud
cloud
part cloud
part cloud
cloud
part cloud
cloud
cloud
cloud
cloud
cloud
part cloud
cloud
cloud
cloud
part cloud
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:33
7:33
7:35
7:35
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:50
5:50
5:49
5:49
Temp °C
16
16
17
18
17
17
17
17
17
17
17
19
18
16
17
17
17
17
17
19
20
20
19
18
10
10
10
10
7
7
7
7
7
8
10
14
10
7
9
12
13
12
13
16
17
19
18
18
Swell 1
Height (m)
Direction
Period (s)
1.7
WSW
13
1.7
WSW
14
1.7
WSW
14
1.6
WSW
14
1.7
WSW
13
1.5
WSW
13
1.5
WSW
13
1.5
WSW
13
1.3
WSW
13
1.3
WSW
13
1.3
WSW
13
1.3
WSW
13
1.2
WSW
13
1.1
WSW
13
1
WSW
12
0.9
WSW
12
0.9
WSW
12
0.8
WSW
12
0.8
SSE
11
0.8
SSE
11
0.7
SSE
11
0.6
WSW
11
1.5
SE
8
1.3
SSE
8
Energy kJ
1018
1053
1244
999
975
796
772
745
624
536
528
520
451
402
325
260
226
184
157
157
109
82
319
235
Swell 2
Height (m)
Direction
Period (s)
0.5
S
14
0.4
SW
16
0.6
SSW
15
0.1
S
18
0.1
S
18
0.1
S
16
0.2
SSE
15
0.2
SSE
15
0.3
SSE
14
0.1
SW
10
0.1
S
20
0.5
SSE
12
0.1
SW
16
0.8
WSW
12
0.7
WSW
12
0.7
WSW
12
0.6
SSE
11
0.6
SSE
11
0.6
SW
14
Energy kJ
93
69
144
6
6
5
22
21
40
4
8
87
11
180
123
119
82
82
119
Swell 3
Height (m)
Direction
Period (s)
0.4
S
14
0.4
S
13
0.3
SSW
10
0.2
SSW
16
0.3
SW
15
0.4
SW
15
0.4
SW
15
0.5
WSW
11
0.4
WSW
11
Energy kJ
59
55
19
25
36
56
75
68
47
Wind waves
Height (m)
Direction
Period (s)
1.7
SSE
6
1.9
SE
6
2
SE
6
2.2
SE
6
2.5
SSE
7
3
SE
7
3
SE
8
3.5
SE
8
3.5
SE
8
3.5
SE
9
3
SE
8
2.4
SSE
8
2.1
SSE
9
3
SE
9
3
SE
9
3
SE
9
2.5
SE
9
2.4
SE
9
1.9
SE
9
2
SE
9
1.8
SE
8
1.7
SE
8
2.3
SE
9
Energy kJ
164
220
282
353
652
981
1161
1510
1717
1776
1327
787
645
1201
1509
1297
1010
901
542
571
428
373
853
Nearest Offshore or Glassy
Rating
(10 max)
2
2
4
3
4
4
4
4
4
1
3
3
4
3
2
2
2
1
2
1
2
1
1
1
Distance (km)
37
37
48
37
48
48
48
48
48
47
37
25
30
48
37
25
18
25
25
18
12
0
0
0
Best forecast wave conditions in Cape Town
Rating
(10 max)
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
3
3
3
4
2
Best forecast wave conditions in South Africa
Rating
(10 max)
3
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
3
4
4
4
4
Header Global
Rating
(10 max)
4
6
5
4
4
5
5
4
4
4
4
4
4
4
4
4
5
5
4
5
5
5
5
5
  • 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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