The Knap surf break

The Knap surfForecast / Wales – South East / UK

information circle12 Day Weather and Surf, issued 5 am Tuesday 23 Dec 2025 GMT
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
9.2° 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 0.2m 13s and forecast to arrive on Wednesday (Dec 24) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Thursday (Dec 25) at 9AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 6AM (Wed 24th Dec)0.5ft (0.2m) 13s

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. Mild temperatures (max 7°C on Tue morning, min 1°C on Thu night). Mainly strong winds.

Days 3-6 Weather Summary Mostly dry. Mild temperatures (max 6°C on Fri night, min 1°C on Fri morning). Winds decreasing (fresh winds from the ENE on Fri night, calm by Sun night).

Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
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 (?)
0.2
W
0.2
W
0.1
W
0.2
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
0.1
W
0.1
W
0.1
W
0.1
W
Period(s) (?)111114121312111212121112111614121215141312
Wave
Graph
(?)Metric surfscale
Energy kJ (?)99412133333323254334433
Wind
(km/h)
25
ENE
35
NE
35
ENE
35
ENE
35
ENE
40
NE
45
ENE
40
ENE
35
ENE
30
ENE
35
NE
35
ENE
30
ENE
25
ENE
25
NE
20
NE
25
NE
15
ENE
5
NE
0
N
10
NNE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
glassglassoff
High Tide
/ height (m)
8:55PM
10.29
9:14AM
10.59
9:34PM
10.11
9:54AM
10.39
10:17PM
9.86
10:38AM
10.10
11:04PM
9.56
11:28AM
9.78
11:59PM
9.27
12:27PM
9.49
1:03AM
9.08
1:34PM
9.32
2:13AM
9.12
Low Tide
/ height (m)
2:46PM
1.91
2:59AM
2.04
3:25PM
2.05
3:38AM
2.24
4:05PM
2.27
4:20AM
2.50
4:50PM
2.54
5:07AM
2.80
5:41PM
2.81
6:02AM
3.08
6:41PM
3.03
7:07AM
3.26
7:48PM
3.10
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Saturday
27
Sunday
28
Monday
29
Sunrise8:15--8:15--8:17--8:17--8:17--8:17--8:18--
Sunset-4:07--4:07--4:07--4:08--4:09--4:10--4:10-
part cloud
cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
clear
part cloud
part cloud
clear
clear
clear
part cloud
Rain (mm)
---------------------
Temp. °C755233342246455133344
Feels °C (?)1-3-4-7-6-6-8-7-7-6-4-1-3-1-1-5-3-2121
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Latest Updates

submit an eyeball surf report

Quick surf report for The Knap:

join our community of surf reporters

FREE! Surf-Forecast.com widget for your website

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.


false

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.

Nearest locationNearest
Nearest locationNearest
Nearest locationNearest