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Surf Forecasts:

The Knap surf break

The Knap surfForecast / Wales – South East / UK

information circle12 Day Weather and Surf, issued 5 am Thursday 12 Mar 2026 GMT
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
8.5° C
 (Which is slightly cooler than normal)

Best Forecast Surf Conditions for The Knap this week:

The most powerful waves expected at The Knap in the next 12 days are 1.2m 11s and forecast to arrive on Friday (Mar 13) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 3AM (Fri 13th Mar)4ft (1.2m) 11s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast Moderate rain (total 12mm), heaviest on Thu night. Very mild (max 12°C on Thu afternoon, min 4°C on Fri night). Winds decreasing (near gales from the WSW on Thu night, light winds from the WNW by Fri night).

Days 3-6 Weather Summary Mostly dry. Very mild (max 12°C on Tue morning, min 7°C on Sun morning). Winds decreasing (fresh winds from the W on Sun afternoon, light winds from the ESE by Tue night).

Thursday
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
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
See all maps
Wave Height (m) & direction (?)
0.9
WSW
1
WSW
1.1
WSW
1.1
W
1
W
0.6
W
0.5
W
0.4
W
0.3
W
0.5
WSW
0.8
W
0.8
W
0.6
W
0.6
W
0.6
W
0.5
W
0.5
W
0.4
WSW
0.3
WSW
0.3
WSW
0.3
WSW
Period(s) (?)910111110101313976887891012121513
Wave
Graph
(?)Metric surfscale
Energy kJ (?)11122230828921873885215265074423751445548284235
Wind
(km/h)
45
SSW
40
SW
45
WSW
35
WSW
35
W
15
NW
15
WNW
20
W
15
WSW
25
SSW
30
WNW
20
WNW
30
SW
25
WSW
15
SSW
20
S
25
S
10
ESE
10
E
10
ENE
10
ENE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
ononcross-
on		cross-
on		cross-
on		cross-
off		crosscrosscross-
on		oncrosscrosscross-
on		cross-
on		oncross-
on		cross-
on		crosscross-
off		cross-
off		cross-
off
High Tide
/ height (m)
12:14PM
7.82
1:00AM
7.70
2:00PM
7.39
2:57AM
7.69
3:47PM
7.76
4:18AM
8.35
4:49PM
8.57
5:09AM
9.25
5:31PM
9.48
5:48AM
10.18
6:08PM
10.37
6:24AM
11.04
6:43PM
11.15
Low Tide
/ height (m)
6:28PM
4.44
7:24AM
4.67
8:14PM
4.75
9:21AM
4.53
9:58PM
4.32
10:39AM
3.81
11:00PM
3.51
11:27AM
2.93
11:42PM
2.63
12:05PM
2.06
12:19AM
1.80
12:39PM
1.31
12:52AM
1.10
Thursday
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Sunrise6:35--6:33--6:30--6:28--6:26--6:24--6:20--
Sunset-6:10--6:13--6:15--6:15--6:17--6:20--6:21-
cloud
light rain
mod rain
rain showers
rain showers
clear
part cloud
part cloud
part cloud
cloud
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
Rain (mm)
-2811----------------
Temp. °C111211775887101081010712129121513
Feels °C (?)241-2-2032333134367791310
  • 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

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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.

View detailed surf forecast for The Knap at:
surf-forecast.com

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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