The Knap surf break

The Knap surfForecast / Wales – South East / UK

information circle12 Day Weather and Surf, issued 5 pm Wednesday 10 Dec 2025 GMT
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
9.3° C
(Which is 2.2°C colder than average 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 1.0m 14s and forecast to arrive on Sunday (Dec 14) at 3PM. Winds are predicted to be onshore at the time the swell arrives.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 3PM (Sun 14th Dec)3.5ft (1.0m) 14s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 7mm), mostly falling on Thu night. Very mild (max 12°C on Thu afternoon, min 8°C on Fri morning). Winds increasing (light winds from the SSW on Thu night, strong winds from the SSW by Sat morning).

Days 3-6 Weather Summary Heavy rain (total 35mm), heaviest during Sun night. Very mild (max 13°C on Sat afternoon, min 8°C on Tue morning). Winds decreasing (strong winds from the SW on Sat night, calm by Mon night).

Wed
10
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
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 (?)
0.8
W
0.6
W
0.5
W
0.6
WSW
0.6
WSW
0.6
W
0.7
W
0.6
W
0.8
WSW
1
WSW
1.1
WSW
0.7
WSW
1
WSW
0.8
WSW
0.6
WSW
0.6
W
0.5
W
0.5
W
0.4
WSW
0.4
WSW
0.4
WSW
Period(s) (?)121113121415181716111213141313131315151413
Wave
Graph
(?)Metric surfscale
Energy kJ (?)177948711714515531421728024034318738422213512187121716357
Wind
(km/h)
30
WSW
15
SSW
20
S
25
S
20
S
15
WNW
15
WSW
20
SSW
45
SSW
40
SW
40
WSW
15
SW
40
SSW
30
WSW
10
SW
10
SSW
15
SSE
10
NW
10
N
10
SW
25
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
onononcross-
on
crosscross-
on
ononcross-
on
cross-
on
ononcross-
on
ononcross-
on
cross-
off
cross-
off
cross-
on
on
High Tide
/ height (m)
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
2:32PM
8.75
3:09AM
8.61
3:33PM
8.89
4:04AM
8.93
4:26PM
9.15
4:52AM
9.33
Low Tide
/ height (m)
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
8:44PM
3.64
9:10AM
3.75
9:42PM
3.44
10:07AM
3.46
10:32PM
3.13
10:55AM
3.09
Wed
10
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Sunrise--8:07--8:07--8:08--8:10--8:11--8:11--8:11
Sunset4:04--4:04--4:04--4:04--4:04--4:04--4:04--
part cloud
clear
part cloud
cloud
rain showers
cloud
part cloud
part cloud
light rain
light rain
light rain
cloud
mod rain
heavy rain
cloud
cloud
mod rain
mod rain
light rain
part cloud
cloud
Rain (mm)
----5---212-614--663--
Temp. °C1191112129101011131213131311111098810
Feels °C (?)556775633549689987551
  • 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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