The Knap surf break

The Knap surfForecast / Wales – South East / UK

information circle48hr Weather and Surf, issued 6 pm Monday 18 May 2026 BST
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
12.4° C
(Which is slightly warmer than usual)

How big are the waves at The Knap today?

The current surf forecast for The Knap at 2AM is: 0.3m 7s primary swell from a West direction and 0.2m 3s secondary swell from a South direction (forecast issued at 06:00pm May 18). The wind direction is predicted to be cross-onshore.

Time (BST) & DateWave HeightWave Period
Morning (19 May)1ft (0.3m)8s
Afternoon (19 May)1.5ft (0.4m)8s
Evening (19 May)2ft (0.6m)9s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Moderate rain (total 15mm), heaviest on Mon night. Very mild (max 18°C on Thu morning, min 11°C on Mon afternoon). Winds decreasing (fresh winds from the WSW on Tue afternoon, light winds from the SSE by Wed night).

Mon
18
Tuesday
19
Wednesday
20
Thu
21
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.5
W
7
0.4
W
7
0.3
W
7
0.3
W
7
0.3
W
7
0.3
WSW
8
0.3
WSW
8
0.4
WSW
8
0.5
WSW
8
0.6
WSW
9
0.6
WSW
9
0.7
WSW
9
0.7
WSW
9
0.8
WSW
14
0.8
W
13
0.8
W
13
0.7
W
13
0.6
W
13
0.5
W
13
0.5
W
12
0.4
WSW
12
0.4
WSW
12
0.4
WSW
12
0.4
WSW
11
Wave Graph
Metric surfscale
Energy kJ
23
15
8
8
8
12
13
28
41
58
61
84
92
261
222
222
166
121
84
75
46
46
44
40
Wind (km/h)
25
SSW
25
S
25
SSE
30
S
30
S
25
SW
30
SSW
30
WSW
35
WSW
35
WSW
35
SW
35
WSW
35
WSW
30
WSW
30
WSW
30
W
30
W
20
W
10
WSW
10
SW
10
S
5
SSE
10
SSW
10
S
on
on
cross-on
cross-on
on
on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-on
on
cross-on
High Tide
8:50PM11.95m
9:13AM11.62m
9:36PM11.72m
10:00AM11.17m
10:24PM11.25m
10:51AM10.54m
Low Tide
2:33PM0.75m
2:58AM0.79m
3:17PM0.98m
3:43AM1.09m
4:03PM1.43m
4:33AM1.59m
light rain
light rain
light rain
light rain
light rain
light rain
cloud
rain showers
rain showers
rain showers
cloud
rain showers
rain showers
cloud
clear
cloud
part cloud
part cloud
clear
part cloud
part cloud
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:16
5:15
5:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:00
9:02
9:04
9:05
1
1
3
2
2
1
1
1
1
1
1
Temp °C
11
11
11
12
12
13
14
15
15
13
12
12
12
12
13
14
15
15
14
13
12
13
15
18
6
6
6
6
7
9
9
9
8
6
5
5
6
7
7
8
10
12
13
12
10
12
14
16
Swell 1
Height (m)
Direction
Period (s)
0.5
W
7
0.4
W
7
0.3
W
7
0.3
W
7
0.3
W
7
0.3
WSW
8
0.3
WSW
8
0.5
W
13
0.5
W
12
0.4
WSW
12
0.4
WSW
12
0.4
WSW
12
0.4
WSW
11
Energy kJ
23
15
8
8
8
12
13
84
75
46
46
44
40
Swell 2
Height (m)
Direction
Period (s)
0.1
W
10
Energy kJ
2
Swell 3
Height (m)
Direction
Period (s)
Energy kJ
Wind waves
Height (m)
Direction
Period (s)
0.2
SSW
3
0.2
SSW
3
0.2
S
3
0.2
S
3
0.3
S
3
0.2
S
3
0.2
SSW
3
0.4
WSW
8
0.5
WSW
8
0.6
WSW
9
0.6
WSW
9
0.7
WSW
9
0.7
WSW
9
0.8
WSW
14
0.8
W
13
0.8
W
13
0.7
W
13
0.6
W
13
Energy kJ
1
1
1
1
2
1
1
28
41
58
61
84
92
261
222
222
166
121
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
2
1
1
1
1
1
2
1
1
5
5
5
1
4
4
1
2
2
2
2
2
Distance (km)
85
210
228
479
480
477
499
486
309
374
374
389
403
301
301
463
201
153
29
85
39
33
33
33
Best forecast wave conditions in Wales - South East
Rating
(10 max)
2
2
2
Best forecast wave conditions in United Kingdom
Rating
(10 max)
1
2
2
2
2
1
2
2
2
2
1
1
2
2
4
4
4
3
3
3
3
2
Header Global
Rating
(10 max)
5
5
4
4
4
4
4
4
5
4
5
5
5
4
5
5
4
5
5
4
4
5
5
4
  • 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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