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The Knap Surf Forecast
/ Wales – South East (14 surf breaks) /
The Knap surfForecast / Wales – South East / UK
12 Day Weather and Surf, issued 11 pm Tuesday 11 Mar 2025 GMT
Best Forecast Surf Conditions for The Knap this week:
The most powerful waves expected at The Knap in the next 12 days are 0.7m 12s and forecast to arrive on Wednesday (Mar 19) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 3s period and expected on Wednesday (Mar 12) at 9PM.
| Wave Type | Time (GMT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3AM (Wed 19th Mar) | 2.5ft (0.7m) 12s |
Table - best surf conditions forecast for The Knap over the next 12 days.
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sun 23 | |||||||||||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Rating (10 max) | ||||||||||||||||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  |  |  |  |  |  | |||||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||||||||||||||
| Period(s) (?) | 14 | 13 | 14 | 13 | 13 | 13 | 15 | 13 | 12 | 15 | 14 | 13 | 12 | 11 | 10 | 10 | 9 | 9 | 9 | 7 | 8 | 12 | 12 | 12 | 12 | 10 | 10 | 11 | 13 | 13 | 9 | 8 | 8 | 8 | 7 | 7 |
Wave (?)Graph  | ||||||||||||||||||||||||||||||||||||
| Energy (?) | 4 | 14 | 4 | 3 | 3 | 3 | 5 | 3 | 11 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 1 | 15 | 36 | 104 | 103 | 99 | 98 | 61 | 169 | 156 | 232 | 272 | 130 | 138 | 122 | 60 | 26 | 15 |
Wind (km/h) | ||||||||||||||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | off | off | off | cross- off | cross- off | cross- off | off | cross- off | off | cross- off | cross- off | cross- off | cross- off | cross- off | off | cross- off | cross- on | cross | cross | cross- on | cross | cross- on | cross- on | cross- on | cross- on | on | cross | on | cross- on | cross- off | cross- off | cross- off |
High Tide / height (m) | 5:46AM 10.01 | 6:08PM 10.03 | 6:25AM 10.68 | 6:44PM 10.64 | 6:59AM 11.19 | 7:16PM 11.08 | 7:31AM 11.50 | 7:47PM 11.33 | 8:01AM 11.60 | 8:16PM 11.37 | 8:30AM 11.49 | 8:44PM 11.21 | 8:58AM 11.18 | 9:13PM 10.87 | 9:27AM 10.69 | 9:43PM 10.36 | 9:58AM 10.05 | 10:16PM 9.73 | 10:34AM 9.30 | 10:55PM 9.01 | 11:19AM 8.52 | 11:49PM 8.30 | 12:29PM 7.83 | |||||||||||||
Low Tide / height (m) | 11:45PM 2.95 | 12:10PM 2.41 | 12:21AM 2.26 | 12:42PM 1.82 | 12:52AM 1.69 | 1:10PM 1.36 | 1:20AM 1.27 | 1:38PM 1.06 | 1:48AM 1.02 | 2:05PM 0.94 | 2:17AM 0.99 | 2:33PM 1.02 | 2:46AM 1.17 | 3:02PM 1.31 | 3:15AM 1.55 | 3:31PM 1.78 | 3:46AM 2.10 | 4:03PM 2.41 | 4:21AM 2.77 | 4:38PM 3.13 | 5:03AM 3.51 | 5:26PM 3.88 | 6:04AM 4.20 | |||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sun 23 | |||||||||||||||||||||||||
| Sunrise | - | 6:35 | - | - | 6:33 | - | - | 6:30 | - | - | 6:28 | - | - | 6:26 | - | - | 6:24 | - | - | 6:20 | - | - | 6:18 | - | - | 6:16 | - | - | 6:13 | - | - | 6:11 | - | - | 6:09 | - |
| Sunset | - | - | 6:10 | - | - | 6:13 | - | - | 6:15 | - | - | 6:15 | - | - | 6:17 | - | - | 6:20 | - | - | 6:21 | - | - | 6:22 | - | - | 6:24 | - | - | 6:27 | - | - | 6:28 | - | - | 6:30 |
 |  | |  | | | | | | | | | |  | | |  | | | | | |  | |  |  |  | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 3 | 1 | 7 | 2 | 2 | 3 | 2 | 2 | 31 | 3 | 2 | - | - | - |
| Temp. °C | 5 | 5 | 7 | 4 | 6 | 6 | 4 | 5 | 7 | 4 | 6 | 7 | 4 | 5 | 8 | 4 | 4 | 6 | 5 | 6 | 7 | 7 | 8 | 9 | 8 | 9 | 8 | 8 | 9 | 10 | 6 | 8 | 8 | 6 | 10 | 10 |
| Feels °C (?) | 0 | 0 | 1 | -2 | -1 | -1 | -1 | 1 | 2 | -2 | -2 | -1 | -2 | -2 | 2 | -2 | -1 | 3 | 2 | 1 | 1 | -2 | 1 | 4 | 1 | 1 | -2 | -3 | 1 | 4 | -1 | 2 | 4 | 2 | 5 | 4 |
Short Range Forecast: Mostly dry. Mild temperatures (max 7°C on Wed afternoon, min 2°C on Wed night). Wind will be generally light. | Days 3-6 Weather Summary Mostly dry. Icy conditions (max 8°C on Sun afternoon, min 0°C on Sun night). Winds decreasing (fresh winds from the NE on Sat morning, calm by Mon afternoon). | Days 6-9 Weather Summary Moderate rain (total 15mm), heaviest on Wed night. Mild temperatures (max 9°C on Wed afternoon, min 2°C on Mon night). Winds increasing (light winds from the N on Mon night, near gales from the WSW by Thu afternoon). | Long Range Forecast: Heavy rain (total 43mm), heaviest during Fri night. Very mild (max 10°C on Fri afternoon, min 5°C on Fri night). Winds decreasing (near gales from the WSW on Thu night, light winds from the NNW by Sat night). | |||||||||||||||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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.
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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