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Llanddwyn Island Surf Forecast
/ Wales – Anglesy (10 surf breaks) /
Surf Forecasts:
Llanddwyn Island surfForecast / Wales – Anglesy / UK
48hr Weather and Surf, issued 6 pm Wednesday 20 May 2026 BSTForecast update in hr min s Forecast update imminent
Llanddwyn Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Llanddwyn Island sea temperature is
11.7° C
(Which is slightly warmer than usual)How big are the waves at Llanddwyn Island today?
The current surf forecast for Llanddwyn Island at 10PM is: 1.4m 6s primary swell from a Southwest direction and 0.7m 8s secondary swell from a Southwest direction (forecast issued at 06:00pm May 20). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | - | - |
| Afternoon (20 May) | 5.5ft (1.7m) | 6s |
| Evening (20 May) | 4.5ft (1.4m) | 6s |
Table - waves today at Llanddwyn Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 2mm), mostly falling on Wed night. Very mild (max 16°C on Thu night, min 12°C on Wed afternoon). Winds decreasing (fresh winds from the SW on Wed afternoon, light winds from the S by Fri night). | ||||||||||||||||||||||||
Wed 20 | Thursday 21 | Friday 22 | Sat 23 | |||||||||||||||||||||
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 | 4 AM | 7 AM | 10 AM | 1 PM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SW 6 | SW 6 | SW 6 | SW 6 | SW 8 | SW 6 | SW 6 | SW 6 | SW 6 | SW 7 | SW 7 | SW 7 | SW 4 | SSW 5 | SSW 6 | SW 7 | SW 7 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | |
200 | 161 | 146 | 86 | 75 | 122 | 135 | 105 | 85 | 75 | 75 | 64 | 29 | 36 | 55 | 75 | 62 | 157 | 151 | 145 | 96 | 48 | 47 | 46 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | |
High Tide | 00:50AM4.04m | 1:31PM3.54m | 1:49AM3.84m | 2:41PM3.27m | 2:59AM3.64m | |||||||||||||||||||
Low Tide | 7:26PM0.43m | 8:01AM0.17m | 8:20PM0.68m | 9:00AM0.39m | 9:18PM0.91m | 10:05AM0.59m | ||||||||||||||||||
 |  |  | |  |  | | | | |  | |  | | | | | | | | |  | | | |
 | — | — | — | — | 5:09 | — | — | — | — | — | — | — | 5:09 | — | — | — | — | — | — | — | 5:07 | — | — | — |
 | — | 9:16 | — | — | — | — | — | — | — | 9:17 | — | — | — | — | — | — | — | 9:20 | — | — | — | — | — | 9:21 |
— | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 13 | 12 | 12 | 12 | 12 | 12 | 13 | 15 | 15 | 15 | 16 | 16 | 16 | 15 | 15 | 16 | 16 | 15 | 14 | 14 | 13 | 13 | 14 | 15 |
7 | 7 | 8 | 8 | 7 | 8 | 8 | 11 | 10 | 12 | 15 | 13 | 13 | 13 | 12 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | |
Swell 1 Height (m) Direction Period (s) | — | — | SW 8 | SW 10 | SW 8 | — | W 15 | W 15 | W 15 | SW 7 | SW 7 | W 15 | W 14 | SW 9 | SW 8 | SW 10 | SW 11 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 |
 kJ | — | — | 70 | 24 | 75 | — | 5 | 4 | 4 | 75 | 75 | 4 | 4 | 21 | 16 | 28 | 29 | 157 | 151 | 145 | 96 | 48 | 47 | 46 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | W 15 | W 15 | W 15 | W 15 | — | WSW 10 | — | — | — | — | SW 4 | SW 4 | WSW 4 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 4 | 4 | 4 | 4 | — | 21 | — | — | — | — | 4 | 4 | 1 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 6 | SW 6 | SW 6 | SW 6 | SSW 5 | SW 6 | SW 6 | SW 6 | SW 6 | — | — | SW 7 | SW 4 | SSW 5 | SSW 6 | SW 7 | SW 7 | — | — | — | — | SW 4 | — | — |
| kJ | 200 | 161 | 146 | 86 | 67 | 122 | 135 | 105 | 85 | — | — | 64 | 29 | 36 | 55 | 75 | 62 | — | — | — | — | 6 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 254 | 254 | 78 | 95 | 239 | 239 | 216 | 169 | 172 | 172 | 37 | 108 | 169 | 38 | 169 | 35 | 175 | 35 | 51 | 35 | 35 | 35 | 108 | 35 |
Best forecast wave conditions in Anglesy | ||||||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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Ocean Swells (m)- Wind Speed (km/h)
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