- Forecast
- Maps
- Live
- Weather State
- Spot Information
The Knap Surf Forecast
/ Wales – South East (14 surf breaks) /
Surf Forecasts:
The Knap surfForecast / Wales – South East / UK
16 Day Weather and Surf, issued 6 am Sunday 12 Apr 2026 BSTForecast update in hr min s Forecast update imminent
Today's The Knap sea temperature is
10.3° C
(Which is slightly warmer than usual)Best Forecast Surf Conditions for The Knap this week:
The surf forecast for The Knap over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Apr 16) at 7PM. The primary swell is predicted to be 0.7m and 14s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at The Knap in the next 16 days are 0.9m 15s and forecast to arrive on Sunday (Apr 12) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Thu 16th Apr) | 2.5ft (0.7m) 14s |
| Best Surf | 7PM (Thu 16th Apr) | 2.5ft (0.7m) 14s |
| Most Powerful | 1PM (Sun 12th Apr) | 3ft (0.9m) 15s |
Table - best surf conditions forecast for The Knap over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Light rain (total 5mm), mostly falling on Sun morning. Very mild (max 12°C on Tue afternoon, min 5°C on Sun night). Winds decreasing (fresh winds from the WSW on Sun morning, calm by Sun night). | Days 3-6 Weather Summary Light rain (total 6mm), mostly falling on Fri night. Very mild (max 16°C on Wed morning, min 9°C on Wed night). Winds decreasing (fresh winds from the WSW on Wed afternoon, calm by Thu afternoon). | ||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 15 | 14 | 13 | 9 | 11 | 10 | 7 | 9 | 8 | 9 | 12 | 12 | 14 | 14 | 13 | 12 | 12 | 11 | 11 | 10 | 10 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 581 | 198 | 84 | 14 | 20 | 7 | 4 | 6 | 5 | 16 | 46 | 69 | 158 | 200 | 128 | 75 | 45 | 20 | 20 | 17 | 18 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross | cross- on | cross- on | cross- on | cross- on | cross | cross- on | cross- on | on | cross- on | cross- on | cross- on | cross | cross- on | cross- on | on | cross- on | cross | cross | cross- off |
High Tide / height (m) | 3:57PM 7.85 | 4:30AM 8.42 | 5:05PM 8.60 | 5:26AM 9.27 | 5:52PM 9.51 | 6:10AM 10.19 | 6:33PM 10.41 | 6:50AM 11.04 | 7:11PM 11.22 | 7:29AM 11.72 | 7:49PM 11.82 | 8:08AM 12.14 | 8:28PM 12.15 | ||||||||
Low Tide / height (m) | 10:10PM 4.25 | 10:53AM 3.72 | 11:16PM 3.50 | 11:45AM 2.89 | 12:03AM 2.64 | 12:27PM 2.05 | 12:42AM 1.81 | 1:04PM 1.30 | 1:20AM 1.12 | 1:40PM 0.73 | 1:56AM 0.63 | 2:16PM 0.42 | 2:34AM 0.41 | ||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
| Sunrise | 6:24 | - | - | 6:22 | - | - | 6:20 | - | - | 6:18 | - | - | 6:16 | - | - | 6:13 | - | - | 6:11 | - | - |
| Sunset | - | 8:02 | - | - | 8:05 | - | - | 8:07 | - | - | 8:07 | - | - | 8:09 | - | - | 8:12 | - | - | 8:13 | - |
 |  |  |  |  |  |  |  |  | | | | | | | | |  | | | | |
Rain (mm) | 2 | - | - | - | 1 | - | 2 | - | - | 1 | 1 | - | - | - | - | - | - | 4 | - | - | - |
| Temp. °C | 10 | 10 | 7 | 10 | 10 | 8 | 9 | 12 | 12 | 16 | 13 | 10 | 13 | 13 | 11 | 14 | 15 | 12 | 12 | 12 | 11 |
| Feels °C (?) | 4 | 4 | 3 | 7 | 6 | 6 | 4 | 10 | 10 | 11 | 8 | 6 | 10 | 10 | 10 | 11 | 11 | 10 | 8 | 9 | 8 |
- 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 16 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.
Nearest