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The Knap Surf Forecast
/ Wales – South East (14 surf breaks) /
Surf Forecasts:
The Knap surfForecast / Wales – South East / UK
48hr Weather and Surf, issued 6 am Tuesday 16 Sep 2025 BST
How big are the waves at The Knap today?
The current surf forecast for The Knap at 1PM is: 0.7m 12s primary swell from a West direction (forecast issued at 06:00am September 16). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Sep) | 2.5ft (0.8m) | 12s |
| Afternoon (16 Sep) | 2.5ft (0.7m) | 12s |
| Evening (16 Sep) | 1.5ft (0.5m) | 11s |
Table - waves today at The Knap. (Swell directed towards the surf break)
Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||||||||
| 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 10 | 8 | 9 | 9 | 10 | 10 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
| Energy (?) | 194 | 244 | 181 | 134 | 132 | 63 | 58 | 36 | 21 | 13 | 54 | 82 | 88 | 98 | 106 | 98 | 104 | 104 | 81 | 78 | 70 | 59 | 56 | 48 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross | cross | cross | cross | cross- on | cross- on | on | on | on | cross- on | cross- on | cross- on | cross- on | on | on | cross- on | on | on | cross- on | cross- on | on | on | on |
High Tide / height (m) | 1:51AM 8.42 | 2:39PM 8.42 | 3:33AM 8.15 | 4:16PM 8.59 | 4:59AM 8.61 | 5:28PM 9.28 | ||||||||||||||||||
Low Tide / height (m) | 7:54AM 4.06 | 9:03PM 4.14 | 9:53AM 4.22 | 10:55PM 3.79 | 11:24AM 3.66 | 12:01AM 3.06 | ||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||||||||
| Sunrise | - | 6:48 | - | - | - | - | - | - | - | 6:50 | - | - | - | - | - | - | - | 6:50 | - | - | - | - | - | - |
| Sunset | - | - | - | - | - | 7:25 | - | - | - | - | - | - | - | 7:23 | - | - | - | - | - | - | - | 7:22 | - | - |
 |  | |  |  | |  | |  |  | | | | | | | | | | | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | 3 | 3 | 1 | 1 | - | 1 | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 14 | 14 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 15 | 16 | 17 | 18 | 18 | 18 | 18 | 17 | 18 | 19 | 21 | 20 | 19 | 17 | 16 |
| Feels °C (?) | 6 | 8 | 9 | 9 | 9 | 11 | 10 | 11 | 10 | 9 | 11 | 13 | 15 | 16 | 16 | 16 | 13 | 16 | 17 | 18 | 18 | 18 | 16 | 15 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Wales - South East
Light wind has turned cross-on at Rest Bay (moderate winds from the W at St Athan 23 km from Rest Bay). A 1.4m groundswell from the W
1 h 20 min ago
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.
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