Surf Forecasts:
The Knap surf forecast from 11 Nov 2026:
- Best quality surf: Friday 27 Nov, 12AM (local time) - 3.5ft (1.1m), 9s period, W swell with offshore winds.
- Most powerful swell: Tuesday 17 Nov, 6AM (local time) - 4.5ft (1.4m), 11s period, W swell with 466 kJ wave energy.
- Next surfable swell (1★+): Friday 27 Nov, 12AM (local time) - 3.5ft (1.1m), 9s period with W swell.
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 Friday (Nov 27) at 12AM. The primary swell is predicted to be 1.1m and 9s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at The Knap in the next 16 days are 1.4m 11s and forecast to arrive on Tuesday (Nov 17) at 6AM. 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 4s period and expected on Saturday (Nov 21) at 12AM.
| Wave Type | Time (GMT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 27th Nov) | 3.5ft (1.1m) 9s |
| Best Surf | 12AM (Fri 27th Nov) | 3.5ft (1.1m) 9s |
| Most Powerful | 6AM (Tue 17th Nov) | 4.5ft (1.4m) 11s |
Table - best surf conditions forecast for The Knap over the next 16 days.
Short Range ForecastMostly dry. Mild temperatures (max 9°C on Wed afternoon, min 3°C on Fri night). Winds decreasing (fresh winds from the NE on Thu morning, calm by Fri afternoon). | Days 4-6 Weather SummaryHeavy rain (total 31mm), heaviest during Mon night. Very mild (max 15°C on Mon afternoon, min 3°C on Sat morning). Winds increasing (light winds from the ESE on Sat morning, near gales from the WSW by Mon night). | ||||||||||||||||||||
Wednesday 11 | Thursday 12 | Friday 13 | Saturday 14 | Sunday 15 | Monday 16 | Tuesday 17 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | WSW 13 | WSW 13 | SW 11 | W 10 | W 10 | — | — | — | — | W 13 | W 12 | W 12 | W 11 | WSW 5 | W 8 | W 10 | WSW 10 | WSW 10 | W 11 | W 13 | WSW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 17 | 16 | 5 | 2 | 2 | 0 | 0 | 0 | 0 | 3 | 3 | 3 | 2 | 15 | 29 | 33 | 38 | 201 | 240 | 219 | 118 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | off | off | glassy | glassy | cross | cross | cross | cross | cross | cross | cross-on | cross | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 7:48PM10.87m | 8:05AM10.95m | 8:22PM10.51m | 8:39AM10.58m | 8:57PM10.04m | 9:15AM10.10m | 9:34PM9.50m | 9:54AM9.55m | 10:17PM8.93m | 10:40AM9.00m | 11:09PM8.41m | 11:38AM8.54m | 00:17AM8.07m | ||||||||
Low Tide | 1:33PM1.43m | 1:47AM1.49m | 2:07PM1.65m | 2:20AM1.81m | 2:42PM2.01m | 2:56AM2.25m | 3:21PM2.49m | 3:35AM2.79m | 4:04PM3.03m | 4:21AM3.36m | 4:56PM3.55m | 5:18AM3.86m | 6:02PM3.92m | ||||||||
 | |  |  | | | | | | |  |  |  | |  |  | |  | | | | |
 | 7:22 | — | — | 7:24 | — | — | 7:26 | — | — | 7:28 | — | — | 7:28 | — | — | 7:31 | — | — | 7:33 | — | — |
 | — | 4:30 | — | — | 4:29 | — | — | 4:27 | — | — | 4:25 | — | — | 4:23 | — | — | 4:22 | — | — | 4:22 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 7 | 1 | — | 3 | 2 | 17 | 2 | 2 | — |
Temp °C | 8 | 9 | 9 | 7 | 7 | 5 | 6 | 7 | 5 | 6 | 9 | 7 | 10 | 11 | 10 | 13 | 15 | 15 | 12 | 12 | 11 |
Feels °C | 1 | 4 | 4 | -1 | 0 | -1 | 4 | 5 | 2 | 2 | 5 | 3 | 7 | 7 | 5 | 11 | 10 | 10 | 1 | 1 | 0 |
Swell 1 Height (m) Direction Period (s) | WSW 13 | WSW 13 | SW 11 | W 10 | W 10 | — | — | — | — | W 13 | W 12 | W 12 | SW 7 | — | W 8 | W 10 | — | — | — | — | WSW 14 |
| kJ | 17 | 16 | 5 | 2 | 2 | — | — | — | — | 3 | 3 | 3 | 2 | — | 29 | 33 | — | — | — | — | 118 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | W 11 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ENE 3 | — | — | NNE 3 | NNE 3 | — | — | — | — | — | — | — | S 3 | WSW 5 | — | — | WSW 10 | WSW 10 | W 11 | W 13 | W 7 |
| kJ | 1 | — | — | 1 | 1 | — | — | — | — | — | — | — | 1 | 15 | — | — | 38 | 201 | 240 | 219 | 37 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 105 | 25 | 22 | 35 | 55 | 65 | 72 | 65 | 68 | 74 | 69 | 69 | 171 | 129 | 61 | 214 | 566 | 427 | 421 | 700 | 504 |
Best forecast wave conditions in Wales - South East | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.
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