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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 Saturday 17 Jan 2026 GMT
Forecast update in hr  min  s Forecast update imminent
Today's The Knap sea temperature is
6.4° C
 (Which is 3.4°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 1.1m 15s and forecast to arrive on Friday (Jan 23) at 6PM. 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 6PM (Fri 23rd Jan)3.5ft (1.1m) 15s

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 Sun night. Mild temperatures (max 9°C on Sat afternoon, min 6°C on Sat morning). Wind will be generally light.

Days 3-6 Weather Summary Heavy rain (total 21mm), heaviest during Thu night. Mild temperatures (max 9°C on Tue morning, min 5°C on Tue night). Winds increasing (light winds from the S on Tue night, strong winds from the SE by Thu night).

Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
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 (?)
0.5
W
0.4
WSW
0.3
WSW
0.3
W
0.2
W
0.2
W
0.2
W
0.2
W
0.3
W
0.4
WSW
0.3
W
0.3
WSW
0.4
WSW
0.4
WSW
0.3
W
0.3
WSW
0.6
WSW
0.6
W
0.5
W
0.9
WSW
0.9
WSW
Period(s) (?)141312111110101116161514131312121615131513
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1015829229889438142415755262821416190397299
Wind
(km/h)
10
SE
15
SE
10
ENE
15
NE
5
ENE
15
SE
10
E
15
SE
15
SE
15
SE
30
SSE
35
S
15
SE
30
SE
20
SE
25
SSE
25
WSW
40
SE
20
S
25
S
30
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscrosscross-
off		cross-
off		cross-
off		crosscross-
off		crosscross-
on		cross-
on		cross-
on		cross-
on		cross-
on		crosscross-
on		cross-
on		cross-
on		crossoncross-
on		cross
High Tide
/ height (m)
6:15PM
9.61
6:34AM
10.16
6:53PM
10.11
7:11AM
10.67
7:29PM
10.54
7:46AM
11.06
8:04PM
10.85
8:21AM
11.32
8:39PM
11.01
8:56AM
11.41
9:15PM
11.00
9:33AM
11.31
9:53PM
10.81
Low Tide
/ height (m)
12:07PM
2.79
12:22AM
2.54
12:47PM
2.26
1:01AM
2.07
1:24PM
1.80
1:37AM
1.68
1:59PM
1.47
2:11AM
1.43
2:33PM
1.28
2:45AM
1.32
3:07PM
1.26
3:19AM
1.37
3:42PM
1.40
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
Sunrise8:10--8:08--8:07--8:07--8:06--8:04--8:03--
Sunset-4:36--4:37--4:38--4:40--4:42--4:44--4:45-
part cloud
clear
part cloud
light rain
light rain
mod rain
light rain
light rain
part cloud
clear
part cloud
rain showers
clear
light rain
rain showers
rain showers
rain showers
mod rain
part cloud
rain showers
rain showers
Rain (mm)
---32743---6-33117-12
Temp. °C897688899999889998675
Feels °C (?)46427766632021554-111-2
  • 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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Latest Updates

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Quick surf report for The Knap:

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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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