The Knap surf break

The Knap surfForecast / Wales – South East / UK

information circle12 Day Weather and Surf, issued 5 am Friday 12 Dec 2025 GMT
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
9.7° C
(Which is 1.7°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 1.4m 19s and forecast to arrive on Friday (Dec 19) at 12PM. 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+)--
Best Surf--
Most Powerful12PM (Fri 19th Dec)4.5ft (1.4m) 19s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Very mild (max 11°C on Sun night, min 8°C on Sat afternoon). Mainly fresh winds.

Days 3-6 Weather Summary Moderate rain (total 11mm), heaviest on Wed afternoon. Very mild (max 12°C on Mon morning, min 7°C on Tue morning). Winds increasing (calm on Tue afternoon, strong winds from the SSW by Wed morning).

Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
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 (?)
0.6
W
0.7
W
0.6
W
0.5
W
0.5
W
0.5
W
0.4
WSW
0.6
W
0.6
W
0.6
WSW
0.5
W
0.5
W
0.4
WSW
0.4
WSW
0.4
WSW
0.4
WSW
0.4
W
0.9
WSW
0.7
W
0.6
W
0.5
W
Period(s) (?)1518171615812121212131315151413811191917
Wave
Graph
(?)Metric surfscale
Energy kJ (?)155311215126109354610610410782907771665818204358251154
Wind
(km/h)
15
W
10
W
10
WSW
15
SW
15
SW
20
SSW
25
SSW
25
SSW
30
S
20
S
30
SSW
10
W
15
NW
10
WNW
15
SSW
30
SSW
35
SSW
15
W
15
SE
50
SSE
30
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscrosscross-
on
ononononononononcross-
on
cross-
off
crossonononcrosscrosscross-
on
on
High Tide
/ height (m)
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
5:11PM
9.47
5:33AM
9.74
5:51PM
9.78
Low Tide
/ height (m)
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
11:15PM
2.78
11:38AM
2.71
11:55PM
2.45
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Sunrise8:07--8:08--8:10--8:11--8:11--8:11--8:12--
Sunset-4:04--4:04--4:04--4:04--4:04--4:05--4:05-
cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
cloud
cloud
light rain
light rain
cloud
part cloud
part cloud
part cloud
light rain
light rain
rain showers
part cloud
light rain
mod rain
Rain (mm)
---------11----243-18
Temp. °C101010999101011121110898101110111210
Feels °C (?)677554445758566447514
  • 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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Quick surf report for The Knap:

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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our The Knap surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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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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