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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 pm Thursday 27 Nov 2025 GMT
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
10.3° C
 (Which is 1.9°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 0.9m 16s and forecast to arrive on Friday (Nov 28) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 5s period and expected on Saturday (Nov 29) at 6PM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful12PM (Fri 28th Nov)3ft (0.9m) 16s

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 Moderate rain (total 19mm), heaviest on Fri night. Very mild (max 14°C on Thu afternoon, min 5°C on Sat night). Winds decreasing (strong winds from the SW on Fri morning, calm by Sun morning).

Days 3-6 Weather Summary Heavy rain (total 34mm), heaviest during Mon night. Very mild (max 13°C on Mon afternoon, min 6°C on Sun night). Winds decreasing (strong winds from the S on Mon morning, light winds from the W by Wed morning).

Thu
27
Friday
28
Saturday
29
Sunday
30
Monday
01
Tuesday
02
Wednesday
03
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
See all maps
Wave Height (m) & direction (?)
0.6
WSW
0.6
W
0.7
W
1.1
W
0.7
W
0.6
WSW
0.5
W
0.3
WSW
0.3
WSW
0.3
W
0.2
W
0.5
W
0.6
W
1
W
0.6
W
0.6
W
0.6
W
0.6
W
0.6
W
0.4
W
0.3
WSW
Period(s) (?)899999121211111199111012151414109
Wave
Graph
(?)Metric surfscale
Energy kJ (?)50577919983557527232193964242801011571531362916
Wind
(km/h)
30
SW
30
WSW
30
SW
35
W
30
SW
15
N
15
NW
20
NW
5
N
10
W
20
SSW
45
S
40
SSW
40
WSW
25
SW
15
SW
15
WSW
10
WNW
10
WSW
20
SSE
25
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		oncross-
on		onoffcross-
off		cross-
off		cross-
off		crossonononcross-
on		cross-
on		cross-
on		cross-
on		crosscross-
on		cross-
on		cross
High Tide
/ height (m)
11:29PM
8.67
11:59AM
8.91
12:38AM
8.51
1:11PM
8.88
1:53AM
8.69
2:24PM
9.18
3:02AM
9.19
3:28PM
9.74
4:00AM
9.89
4:24PM
10.39
4:52AM
10.61
5:15PM
10.99
5:41AM
11.25
Low Tide
/ height (m)
5:13PM
3.38
5:36AM
3.65
6:21PM
3.58
6:48AM
3.77
7:35PM
3.49
8:04AM
3.56
8:45PM
3.11
9:11AM
3.07
9:45PM
2.54
10:10AM
2.45
10:38PM
1.93
11:01AM
1.82
11:25PM
1.40
11:49AM
1.29
Thu
27
Friday
28
Saturday
29
Sunday
30
Monday
01
Tuesday
02
Wednesday
03
Sunrise--7:50--7:52--7:52--7:54--7:56--7:56--7:58
Sunset4:10--4:09--4:08--4:08--4:07--4:07--4:07--
cloud
part cloud
part cloud
rain showers
heavy rain
light rain
cloud
part cloud
clear
part cloud
light rain
light rain
light rain
heavy rain
rain showers
rain showers
clear
clear
clear
rain showers
mod rain
Rain (mm)
---1162----4531912---48
Temp. °C141212101198667101213109989998
Feels °C (?)863255314425643557622
  • 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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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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