The Knap surf break

The Knap surfForecast / Wales – South East / UK

information circle12 Day Weather and Surf, issued 6 pm Saturday 05 Jul 2025 BST
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
18.8° C
(Which is 4.2°C warmer than normal for this time of year)


Best Forecast Surf Conditions for The Knap this week:

The most powerful waves expected at The Knap in the next 12 days are 0.5m 9s and forecast to arrive on Monday (Jul 07) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 5s period and expected on Monday (Jul 07) at 7AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 4AM (Mon 7th Jul)1.5ft (0.5m) 9s

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

Updates in  hr  min  s Forecast update imminent
Sat
05
Sunday
06
Monday
07
Tuesday
08
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thu
17
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
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
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.6
W
0.4
W
0.5
W
0.6
W
0.4
W
0.5
W
0.4
WNW
0.2
W
0.3
W
0.3
W
0.2
W
0.1
W
0.1
W
0.1
W
0.1
W
0.1
W
0.1
W
0.1
W
0.1
W
0.1
W
0.1
W
0.1
W
0.1
W
0.2
W
0.2
W
0.2
W
0.2
W
0.1
W
0.3
W
0.4
WSW
0.4
WSW
0.4
WSW
0.3
W
0.3
W
0.3
W
0.3
W
Period(s) (?)87779668588777771099888988888811111010999
Wave
Graph
(?)Metric surfscale
Energy (?)4224323525181465114111113221112555511043433417161414
Wind
(km/h)
30
WSW
20
WSW
25
WNW
30
WNW
25
NW
20
NNW
30
WNW
20
W
10
NW
25
WNW
15
WNW
10
WNW
20
WNW
5
NW
10
E
5
WNW
5
NW
10
E
5
S
10
ESE
15
E
20
S
0
NNE
5
ENE
5
N
10
E
15
E
10
NW
15
W
25
WNW
30
WNW
15
NW
5
W
20
WNW
5
NNW
5
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
cross-
on
crosscrosscross-
off
cross-
off
cross-
off
crosscross-
off
crosscrosscrosscrossglasscross-
off
glassglasscross-
off
glasscrosscross-
off
onglassglassglasscross-
off
cross-
off
cross-
off
crosscrosscrosscross-
off
glasscrosscross-
off
glass
High Tide
/ height (m)
3:57AM
8.50
4:32PM
8.54
4:58AM
8.64
5:29PM
8.87
5:52AM
8.95
6:18PM
9.31
6:39AM
9.35
7:01PM
9.79
7:22AM
9.78
7:42PM
10.26
8:02AM
10.18
8:21PM
10.67
8:40AM
10.50
8:59PM
10.98
9:19AM
10.72
9:38PM
11.16
9:58AM
10.80
10:18PM
11.18
10:39AM
10.72
10:59PM
11.03
11:22AM
10.49
11:44PM
10.71
12:10PM
10.13
Low Tide
/ height (m)
9:28PM
3.89
10:02AM
3.71
10:33PM
3.78
11:03AM
3.53
11:34PM
3.49
11:58AM
3.21
12:26AM
3.07
12:46PM
2.81
1:12AM
2.62
1:29PM
2.41
1:55AM
2.20
2:09PM
2.06
2:34AM
1.85
2:48PM
1.78
3:12AM
1.60
3:26PM
1.61
3:50AM
1.49
4:04PM
1.58
4:29AM
1.51
4:43PM
1.68
5:10AM
1.68
5:25PM
1.93
5:54AM
1.99
Sat
05
Sunday
06
Monday
07
Tuesday
08
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thu
17
Sunrise--5:03--5:05--5:05--5:07--5:07--5:09--5:09--5:11--5:11--5:13--5:13--5:15
Sunset9:30--9:30--9:30--9:29--9:29--9:28--9:27--9:25--9:24--9:23--9:23--9:22--
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Rain (mm)
------------------------------------
Temp. °C181617181518181518191621212023262325282427292125282523221821211821211923
Feels °C (?)141312121115121115141220191923262224272425262025272522221617161519181722

Short Range Forecast: Mostly dry. Very mild (max 18°C on Sat afternoon, min 13°C on Mon night). Winds decreasing (fresh winds from the NW on Sun night, light winds from the NW by Tue morning).

Days 3-6 Weather Summary Mostly dry. Warm (max 26°C on Thu afternoon, min 15°C on Tue night). Wind will be generally light.

Days 6-9 Weather Summary Mostly dry. Warm (max 29°C on Sat afternoon, min 17°C on Fri night). Wind will be generally light.

Long Range Forecast: Mostly dry. Warm (max 23°C on Thu morning, min 16°C on Mon night). Wind will be generally light.

  • 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 The Knap Surf forecast

The above surf forecast table for The Knap provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at The Knap can be found by selecting the local surf guide option on the grey menu. Our The Knap 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 (The Knap) 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 The Knap 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.

The Knap is 2 km (1 miles) from Barry. If you plan a holiday in Wales - South East, look for hotels and other accommodation in Barry. Barry has rooms for a wide range of budgets as well as car hire and transport links.

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