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Surf Forecasts:

The Knap surf break

The Knap surfForecast / Wales – South East / UK

information circle12 Day Weather and Surf, issued 11 pm Thursday 20 Nov 2025 GMT
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
12.1° C
 (Which is normal 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 1.6m 12s and forecast to arrive on Sunday (Nov 23) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 3s period and expected on Tuesday (Nov 25) at 12PM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 6PM (Sun 23rd Nov)5ft (1.6m) 12s

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

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

Short Range Forecast Light rain (total 7mm), mostly falling on Fri night. Very mild (max 11°C on Sat night, min 4°C on Thu night). Winds increasing (calm on Fri morning, strong winds from the W by Sun afternoon).

Days 3-6 Weather Summary Light rain (total 6mm), mostly falling on Sun night. Mild temperatures (max 9°C on Sun night, min 6°C on Mon night). Winds decreasing (strong winds from the WSW on Sun night, calm by Wed morning).

Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thu
27
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
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 (?)
0.2
WNW
0.2
W
0.1
W
0.1
W
0.6
WSW
0.4
W
0.2
W
0.9
W
1.5
W
1.2
W
0.7
W
0.6
W
0.4
NW
0.2
W
0.2
W
0.2
W
0.2
W
0.2
W
0.4
WSW
0.7
W
0.8
W
Period(s) (?)651413771281110997106121110588
Wave
Graph
(?)Metric surfscale
Energy kJ (?)324336161110855330881541173119885582
Wind
(km/h)
15
N
5
N
10
SW
25
SSW
35
SSW
15
WNW
20
S
35
W
40
W
50
WSW
35
NNW
25
NNW
15
NW
20
N
25
N
10
NNW
5
N
10
W
15
WSW
25
WSW
25
WSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
on		ononcrossoncrosscross-
on		cross-
on		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		glasscrosscross-
on		cross-
on		cross-
on
High Tide
/ height (m)
7:05AM
10.86
7:20PM
10.69
7:37AM
10.85
7:53PM
10.55
8:10AM
10.69
8:27PM
10.28
8:45AM
10.41
9:04PM
9.92
9:23AM
10.04
9:45PM
9.48
10:06AM
9.61
10:32PM
9.04
10:57AM
9.20
Low Tide
/ height (m)
12:49AM
1.61
1:08PM
1.65
1:22AM
1.61
1:41PM
1.70
1:55AM
1.76
2:16PM
1.89
2:29AM
2.05
2:52PM
2.20
3:06AM
2.43
3:32PM
2.60
3:47AM
2.87
4:17PM
3.02
4:35AM
3.31
5:13PM
3.38
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thu
27
Sunrise-7:39--7:41--7:43--7:43--7:46--7:47--7:48-
Sunset--4:16--4:15--4:15--4:14--4:13--4:12--4:10
clear
clear
part cloud
light rain
rain showers
cloud
rain showers
part cloud
part cloud
rain showers
cloud
cloud
part cloud
part cloud
part cloud
clear
part cloud
part cloud
cloud
part cloud
part cloud
Rain (mm)
---41-2--6-----------
Temp. °C56671010111010999888777101111
Feels °C (?)142126411-223221354556
  • 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

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Ben Mondy

Quiksilver Teams Up With PrimaLoft® For World’s First Thermal Layering System for a Wetsuit.

Feel that? If you are in the northern hemisphere, you will have had that first bite of winter. The lick of a frost, the chill of a cold offshore breeze and the sound of winter swells pounding the shores. If you are near the mountains, your favourite jackets, gloves, and footwear might get dusted off and prepped for battle. And in that beautiful Venn diagram, you will find PrimaLoft. They have spent over 40 years developing innovative insulations that have powered your warmest winter gear. In t

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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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