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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 Wednesday 21 Jan 2026 GMT
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
6.5° C
 (Which is 3.2°C colder than average for this time of year)

Best Forecast Surf Conditions for The Knap this week:

The surf forecast for The Knap over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Jan 27) at 9AM. The primary swell is predicted to be 1.5m and 19s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at The Knap in the next 12 days are 1.6m 19s and forecast to arrive on Tuesday (Jan 27) at 6AM. 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+) 9AM (Tue 27th Jan)5ft (1.5m) 19s
Best Surf 9AM (Tue 27th Jan)5ft (1.5m) 19s
Most Powerful 6AM (Tue 27th Jan)5ft (1.6m) 19s

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 Heavy rain (total 29mm), heaviest during Wed morning. Very mild (max 11°C on Wed morning, min 6°C on Thu night). Winds increasing (light winds from the SE on Thu afternoon, strong winds from the ESE by Fri night).

Days 3-6 Weather Summary Heavy rain (total 36mm), heaviest during Mon night. Mild temperatures (max 8°C on Sat afternoon, min 5°C on Sun night). Winds decreasing (strong winds from the SE on Sat afternoon, calm by Sun afternoon).

Wednesday
21
Thursday
22
Friday
23
Saturday
24
Sunday
25
Monday
26
Tuesday
27
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.4
WSW
0.3
WSW
0.3
WSW
0.5
WSW
0.7
WSW
0.6
W
0.3
WSW
0.6
WSW
0.6
WSW
0.6
WSW
0.6
WSW
0.7
WSW
0.6
W
0.5
W
0.6
W
0.6
W
0.5
W
0.6
W
1.5
W
1
W
1
W
Period(s) (?)131312181514131716161516111313141514191818
Wave
Graph
(?)Metric surfscale
Energy kJ (?)5533281762401423323219619817225682901231361121401639625639
Wind
(km/h)
40
ESE
40
SSE
20
SSE
20
ESE
10
SE
20
SE
20
SSE
30
SSE
35
ESE
45
ESE
45
SE
35
S
15
SE
5
NE
5
ESE
15
SE
40
SSE
35
NW
5
SSE
20
NW
25
WNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
on		cross-
on		crosscrosscrosscross-
on		cross-
on		crosscrosscrosscross-
on		crossoffcrosscrosscross-
on		cross-
off		glasscross-
off		cross
High Tide
/ height (m)
8:39PM
11.01
8:56AM
11.41
9:15PM
11.00
9:33AM
11.31
9:53PM
10.81
10:12AM
11.00
10:34PM
10.44
10:56AM
10.51
11:21PM
9.93
11:46AM
9.89
12:17AM
9.36
12:48PM
9.25
1:28AM
8.92
Low Tide
/ height (m)
2:33PM
1.28
2:45AM
1.32
3:07PM
1.26
3:19AM
1.37
3:42PM
1.40
3:55AM
1.60
4:20PM
1.70
4:35AM
1.99
5:02PM
2.15
5:21AM
2.51
5:52PM
2.71
6:17AM
3.09
6:54PM
3.26
Wednesday
21
Thursday
22
Friday
23
Saturday
24
Sunday
25
Monday
26
Tuesday
27
Sunrise8:06--8:04--8:03--8:02--8:00--8:00--7:58--
Sunset-4:42--4:44--4:45--4:47--4:49--4:51--4:52-
mod rain
light rain
light rain
light rain
light rain
rain showers
rain showers
rain showers
rain showers
light rain
light rain
rain showers
part cloud
part cloud
part cloud
light rain
light rain
rain showers
part cloud
cloud
part cloud
Rain (mm)
652245122232---3422---
Temp. °C111010987876788776787775
Feels °C (?)22456-12-1-1-3-2-1353-2-1342-1
  • 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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