Surf Forecasts:
The Knap surf forecast from 14 Nov 2026:
- Best quality surf: Monday 23 Nov, 9PM (local time) - 3ft (0.9m), 11s period, WSW swell with cross-offshore winds.
- Most powerful swell: Saturday 28 Nov, 12AM (local time) - 5ft (1.6m), 17s period, WSW swell with 1,505 kJ wave energy.
- Next surfable swell (1★+): Monday 23 Nov, 9PM (local time) - 3ft (0.9m), 11s period with WSW 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 Monday (Nov 23) at 9PM. The primary swell is predicted to be 0.9m and 11s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at The Knap in the next 16 days are 1.6m 17s and forecast to arrive on Saturday (Nov 28) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Friday (Nov 20) at 12AM.
| Wave Type | Time (GMT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 23rd Nov) | 3ft (0.9m) 11s |
| Best Surf | 9PM (Mon 23rd Nov) | 3ft (0.9m) 11s |
| Most Powerful | 12AM (Sat 28th Nov) | 5ft (1.6m) 17s |
Table - best surf conditions forecast for The Knap over the next 16 days.
Short Range ForecastHeavy rain (total 44mm), heaviest during Mon night. Very mild (max 16°C on Mon night, min 5°C on Sat morning). Winds increasing (light winds from the SSE on Sat night, strong winds from the WSW by Mon night). | Days 4-6 Weather SummaryHeavy rain (total 27mm), heaviest during Tue afternoon. Very mild (max 12°C on Thu morning, min 9°C on Thu night). Winds increasing (light winds from the WSW on Tue afternoon, strong winds from the WSW by Wed morning). | ||||||||||||||||||||
Saturday 14 | Sunday 15 | Monday 16 | Tuesday 17 | Wednesday 18 | Thursday 19 | Friday 20 | |||||||||||||||
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) | W 13 | W 12 | W 12 | W 11 | WSW 11 | WNW 6 | WSW 10 | WSW 9 | WSW 10 | WSW 10 | W 10 | WSW 13 | WSW 16 | WSW 17 | W 16 | WSW 14 | W 14 | W 14 | W 13 | WSW 12 | WSW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 3 | 3 | 2 | 12 | 10 | 10 | 9 | 9 | 157 | 192 | 218 | 568 | 702 | 509 | 213 | 134 | 136 | 82 | 49 | 24 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross-on | cross | cross | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 9:15AM10.10m | 9:34PM9.50m | 9:54AM9.55m | 10:17PM8.93m | 10:40AM9.00m | 11:09PM8.41m | 11:38AM8.54m | 00:17AM8.07m | 12:52PM8.34m | 1:36AM8.10m | 2:09PM8.53m | 2:48AM8.51m | 3:14PM9.03m | ||||||||
Low Tide | 3:21PM2.49m | 3:35AM2.79m | 4:04PM3.03m | 4:21AM3.36m | 4:56PM3.55m | 5:18AM3.86m | 6:02PM3.92m | 6:30AM4.15m | 7:20PM3.98m | 7:49AM4.07m | 8:32PM3.68m | 8:58AM3.65m | 9:32PM3.14m | ||||||||
 | |  |  | |  |  | |  |  | |  | | |  | | | | | | | |
 | 7:28 | — | — | 7:28 | — | — | 7:31 | — | — | 7:33 | — | — | 7:33 | — | — | 7:35 | — | — | 7:37 | — | — |
 | — | 4:25 | — | — | 4:23 | — | — | 4:22 | — | — | 4:22 | — | — | 4:21 | — | — | 4:19 | — | — | 4:17 | — |
mm | — | — | — | 5 | 4 | — | — | 1 | 34 | 2 | 4 | 6 | 4 | 3 | 3 | 1 | 1 | 3 | 2 | 3 | 2 |
Temp °C | 8 | 10 | 8 | 10 | 11 | 9 | 8 | 8 | 16 | 11 | 11 | 11 | 11 | 11 | 11 | 12 | 12 | 11 | 12 | 12 | 12 |
Feels °C | 4 | 5 | 4 | 6 | 5 | 2 | 4 | 3 | 9 | 1 | 3 | 5 | 2 | 2 | 3 | 7 | 6 | 6 | 4 | 5 | 9 |
Swell 1 Height (m) Direction Period (s) | W 13 | W 12 | W 5 | W 6 | — | W 11 | WNW 5 | WSW 9 | WSW 10 | — | — | — | — | — | — | WSW 14 | W 14 | W 14 | W 13 | WSW 12 | WSW 11 |
| kJ | 3 | 3 | 1 | 1 | — | 3 | 5 | 9 | 9 | — | — | — | — | — | — | 213 | 134 | 136 | 82 | 49 | 24 |
Swell 2 Height (m) Direction Period (s) | — | — | W 12 | W 11 | — | — | WSW 10 | W 6 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 3 | 2 | — | — | 10 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | W 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | WSW 11 | WNW 6 | — | — | SSW 4 | WSW 10 | W 10 | WSW 13 | WSW 16 | WSW 17 | W 16 | — | — | NNE 4 | — | — | — |
| kJ | — | — | — | — | 12 | 10 | — | — | 5 | 157 | 192 | 218 | 568 | 702 | 509 | — | — | 6 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 74 | 165 | 314 | 44 | 177 | 95 | 53 | 39 | 480 | 462 | 475 | 313 | 320 | 370 | 370 | 116 | 219 | 78 | 214 | 330 | 370 |
Best forecast wave conditions in Wales - South East | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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