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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 12 am Wednesday 20 May 2026 BSTForecast update in hr min s Forecast update imminent
Today's The Knap sea temperature is
12.7° C
(Which is 1.2°C warmer than normal for this time of year)How big are the waves at The Knap today?
The current surf forecast for The Knap at 4AM is: 0.8m 10s primary swell from a West-southwest direction (forecast issued at 12:00am May 20). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | 2.5ft (0.8m) | 14s |
| Afternoon (20 May) | 2.5ft (0.7m) | 13s |
| Evening (20 May) | 1.5ft (0.5m) | 13s |
Table - waves today at The Knap. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastSome drizzle, heaviest during Tue night. Warm (max 21°C on Fri morning, min 12°C on Tue night). Winds decreasing (fresh winds from the WSW on Tue night, light winds from the SSE by Wed night). | ||||||||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | ||||||||||||||||||||||
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 | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
WSW 9 | WSW 10 | W 14 | W 13 | W 13 | W 13 | W 13 | W 13 | W 12 | WSW 12 | WSW 12 | WSW 12 | WSW 11 | WSW 11 | WSW 10 | WSW 10 | WSW 10 | WSW 10 | WSW 10 | WSW 12 | WSW 11 | WSW 11 | WSW 11 | WSW 11 | |
86 | 123 | 253 | 229 | 222 | 166 | 121 | 84 | 75 | 46 | 46 | 44 | 23 | 22 | 21 | 20 | 20 | 19 | 18 | 26 | 23 | 22 | 22 | 22 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross | cross-on | on | on | cross | cross | |
High Tide | 10:00AM11.17m | 10:24PM11.25m | 10:51AM10.54m | 11:16PM10.62m | 11:46AM9.83m | |||||||||||||||||||
Low Tide | 3:43AM1.09m | 4:03PM1.43m | 4:33AM1.59m | 4:52PM2.04m | 5:27AM2.21m | 5:48PM2.69m | ||||||||||||||||||
 |  |  | | | |  |  |  | |  | | | | | | | | | | | | | | |
 | — | 5:15 | — | — | — | — | — | — | — | 5:13 | — | — | — | — | — | — | — | 5:13 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:04 | — | — | — | — | — | — | — | 9:05 | — | — | — | — | — | — | — | 9:07 | — |
1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 12 | 12 | 12 | 13 | 15 | 14 | 14 | 14 | 13 | 12 | 13 | 15 | 18 | 18 | 17 | 15 | 14 | 14 | 14 | 18 | 21 | 21 | 19 | 17 |
5 | 5 | 6 | 7 | 10 | 9 | 10 | 13 | 12 | 10 | 12 | 14 | 16 | 15 | 14 | 13 | 13 | 13 | 13 | 17 | 19 | 20 | 19 | 17 | |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | — | — | W 13 | W 12 | WSW 12 | WSW 12 | WSW 12 | WSW 11 | WSW 11 | WSW 10 | WSW 10 | WSW 10 | WSW 10 | WSW 10 | WSW 12 | WSW 11 | WSW 11 | WSW 11 | WSW 11 |
 kJ | — | — | — | — | — | — | — | 84 | 75 | 46 | 46 | 44 | 23 | 22 | 21 | 20 | 20 | 19 | 18 | 26 | 23 | 22 | 22 | 22 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 9 | WSW 10 | W 14 | W 13 | W 13 | W 13 | W 13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 86 | 123 | 253 | 229 | 222 | 166 | 121 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 389 | 427 | 301 | 141 | 466 | 153 | 153 | 29 | 29 | 33 | 33 | 33 | 28 | 32 | 65 | 14 | 14 | 14 | 14 | 25 | 33 | 61 | 28 | 28 |
Best forecast wave conditions in Wales - South East | ||||||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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