The Knap surf break

The Knap surfForecast / Wales – South East / UK

information circle12 Day Weather and Surf, issued 5 pm Sunday 07 Dec 2025 GMT
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
9.5° C
(Which is 2.1°C colder than average for this time of year)


Best Forecast Surf Conditions for The Knap this week:

The surf forecast for The Knap over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Dec 12) at 3PM. The primary swell is predicted to be 0.6m and 17s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at The Knap in the next 12 days are 0.8m 17s and forecast to arrive on Monday (Dec 08) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 3PM (Fri 12th Dec)2ft (0.6m) 17s
Best Surf 3PM (Fri 12th Dec)2ft (0.6m) 17s
Most Powerful 9PM (Mon 8th Dec)2.5ft (0.8m) 17s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Moderate rain (total 17mm), heaviest on Mon night. Very mild (max 14°C on Tue morning, min 9°C on Tue night). Winds increasing (light winds from the SSE on Mon night, strong winds from the SSW by Tue morning).

Days 3-6 Weather Summary Moderate rain (total 14mm), heaviest on Fri afternoon. Very mild (max 11°C on Wed afternoon, min 8°C on Wed night). Mainly fresh winds.

Sun
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Saturday
13
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.9
WSW
0.4
WSW
0.6
WSW
0.3
WSW
0.7
WSW
0.6
WSW
0.6
WSW
0.8
WSW
0.4
WSW
0.3
WSW
0.3
WSW
0.5
W
0.5
W
0.6
WSW
0.5
WSW
0.6
W
0.6
W
0.6
W
0.6
W
0.5
W
0.6
W
Period(s) (?)13121119171615141312121312131317161614912
Wave
Graph
(?)Metric surfscale
Energy kJ (?)2314710273304193169254552926877513710121219017415344101
Wind
(km/h)
50
WSW
25
SW
25
SW
15
SSW
30
S
45
S
45
SSW
25
SW
25
SW
25
W
10
SSW
15
SSE
25
S
25
S
30
S
5
SSW
15
SSW
30
SW
30
SW
30
SSW
35
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
onononcross-
on
ononcross-
on
oncross-
on
oncross-
on
cross-
on
cross-
on
cross-
on
glassononcross-
on
oncross-
on
High Tide
/ height (m)
8:22PM
11.36
8:44AM
11.57
9:09PM
10.88
9:31AM
11.06
9:58PM
10.26
10:21AM
10.43
10:50PM
9.59
11:15AM
9.77
11:48PM
9.00
12:16PM
9.20
12:54AM
8.59
1:24PM
8.84
2:03AM
8.46
Low Tide
/ height (m)
2:24AM
1.20
2:53PM
1.29
3:10AM
1.66
3:41PM
1.80
3:58AM
2.23
4:32PM
2.39
4:50AM
2.83
5:28PM
2.96
5:48AM
3.37
6:31PM
3.41
6:54AM
3.74
7:38PM
3.64
8:04AM
3.87
Sun
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Saturday
13
Sunrise--8:03--8:04--8:06--8:07--8:07--8:08--8:10
Sunset4:05--4:05--4:05--4:04--4:04--4:04--4:04--
part cloud
light rain
cloud
rain showers
heavy rain
light rain
rain showers
clear
part cloud
clear
clear
part cloud
part cloud
part cloud
light rain
mod rain
part cloud
part cloud
part cloud
cloud
cloud
Rain (mm)
-1-11212-------410-----
Temp. °C1312121213141411111191011111110910101111
Feels °C (?)458875656655665934443
  • 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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