The Knap surf break

The Knap surfForecast / Wales – South East / UK

information circle12 Day Weather and Surf, issued 12 pm Thursday 03 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 0.8m 6s period and expected on Monday (Jul 07) at 10AM.

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
Thursday
03
Friday
04
Saturday
05
Sunday
06
Monday
07
Tuesday
08
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
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 (?)
0.2
W
0.2
W
0.2
W
0.2
W
0.3
W
0.4
W
0.5
W
0.5
W
0.5
W
0.5
W
0.6
W
0.4
W
0.8
WNW
0.7
WNW
0.3
WNW
0.1
W
0.3
W
0.1
W
0.1
W
0.1
W
0.2
W
0.1
W
0.1
W
0.2
W
0.2
W
0.3
W
0.3
W
0.3
W
0.4
W
0.3
W
0.3
W
0.3
W
0.2
W
0.2
W
0.2
W
0.1
W
Period(s) (?)565666777777666888774775665666666779
Wave
Graph
(?)Metric surfscale
Energy (?)443361225252524342100811031121145579106773443
Wind
(km/h)
10
W
25
W
15
WNW
20
W
25
W
30
WSW
25
WSW
30
WSW
30
WSW
25
W
30
W
20
NW
35
NW
35
NW
15
NW
15
WNW
20
W
10
NW
10
W
20
W
10
WNW
5
WSW
20
W
15
W
15
W
30
WNW
15
WNW
10
WSW
20
W
5
SSW
15
SW
20
SW
25
SW
30
W
30
W
15
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscrosscrosscross-
on
crosscross-
on
cross-
on
cross-
on
cross-
on
crosscrosscross-
off
cross-
off
cross-
off
cross-
off
crosscrosscross-
off
crosscrosscrossglasscrosscrosscrosscrosscrosscross-
on
crossoncross-
on
cross-
on
oncross-
on
crosscross-
on
High Tide
/ height (m)
1:26PM
8.79
1:51AM
8.89
2:25PM
8.49
2:52AM
8.59
3:29PM
8.40
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
Low Tide
/ height (m)
7:25PM
3.47
7:59AM
3.50
8:23PM
3.77
8:59AM
3.70
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
Thursday
03
Friday
04
Saturday
05
Sunday
06
Monday
07
Tuesday
08
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Sunrise5:01--5:01--5:03--5:03--5:05--5:05--5:07--5:07--5:09--5:09--5:11--5:11--
Sunset-9:31--9:30--9:30--9:30--9:30--9:29--9:29--9:28--9:27--9:25--9:24--9:23-
part cloudclearclearpart cloudcloudlight rainlight rainpart cloudcloudcloudpart cloudpart cloudpart cloudclearclearclearclearclearclearclearclearclearclearclearclearclearcloudcloudlight rainrain showersrain showerscloudrain showersclearclearcloud
Rain (mm)
-----22---------------------211-2---
Temp. °C171615171716171716161715171815182016192018212219202017191917202119181816
Feels °C (?)131112131212141312111212111312151612161716202018171615191817191917141313

Short Range Forecast: Light rain (total 4mm), mostly falling on Fri night. Very mild (max 17°C on Thu morning, min 14°C on Thu night). Mainly fresh winds.

Days 3-6 Weather Summary Mostly dry. Warm (max 20°C on Tue afternoon, min 12°C on Sun night). Winds decreasing (fresh winds from the WNW on Sun night, light winds from the WNW by Tue night).

Days 6-9 Weather Summary Mostly dry. Warm (max 22°C on Thu afternoon, min 16°C on Wed morning). Wind will be generally light.

Long Range Forecast: Light rain (total 6mm), mostly falling on Sat afternoon. Warm (max 21°C on Sun afternoon, min 15°C on Mon night). Winds increasing (light winds from the SSW on Sat night, fresh winds from the W by Mon afternoon).

  • 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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