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Surf Forecasts:
Llandanwg surfForecast / Wales – Mid / UK
16 Day Weather and Surf, issued 12 pm Wednesday 13 May 2026 BSTForecast update in hr min s Forecast update imminent
Llandanwg surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Llandanwg sea temperature is
12.7° C
(Which is 2.2°C warmer than normal for this time of year)Best Forecast Surf Conditions for Llandanwg this week:
The surf forecast for Llandanwg over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (May 15) at 7AM. The primary swell is predicted to be 1.1m and 6s period with a secondary swell of 0.7m and 6s. Another secondary swell of 0.1m and 14s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Llandanwg in the next 16 days are 1.5m 8s and forecast to arrive on Wednesday (May 20) at 1AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Wednesday (May 13) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Fri 15th May) | 3.5ft (1.1m) 6s |
| Best Surf | 4AM (Tue 19th May) | 4.5ft (1.4m) 8s |
| Most Powerful | 1AM (Wed 20th May) | 5ft (1.5m) 8s |
Table - best surf conditions forecast for Llandanwg over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 7mm), mostly falling on Wed morning. Very mild (max 11°C on Wed afternoon, min 7°C on Thu night). Winds decreasing (strong winds from the WNW on Wed morning, calm by Fri night). | Days 4-6 Weather SummaryModerate rain (total 17mm), heaviest on Sat night. Very mild (max 11°C on Sat morning, min 9°C on Sat afternoon). Wind will be generally light. | ||||||||||||||||||||
Wednesday 13 | Thursday 14 | Friday 15 | Saturday 16 | Sunday 17 | Monday 18 | Tuesday 19 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
WNW 7 | NW 6 | NW 6 | NW 6 | W 15 | NW 6 | NW 6 | W 14 | NW 4 | NW 5 | W 6 | WSW 4 | NW 3 | W 12 | SW 5 | SW 5 | SW 4 | SSW 7 | SW 9 | SW 9 | SW 8 | |
278 | 89 | 161 | 130 | 4 | 23 | 23 | 4 | 2 | 1 | 1 | 2 | 2 | 3 | 43 | 46 | 26 | 185 | 249 | 246 | 284 | |
Wind (km/h) | |||||||||||||||||||||
cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | glassy | on | on | cross-on | cross-on | on | cross-on | on | on | cross-off | on | on | on | |
High Tide | 6:23PM3.57m | 6:39AM3.98m | 7:09PM3.96m | 7:26AM4.31m | 7:52PM4.29m | 8:11AM4.55m | 8:35PM4.54m | 8:57AM4.68m | 9:19PM4.68m | 9:43AM4.65m | 10:04PM4.70m | 10:30AM4.48m | 10:50PM4.58m | ||||||||
Low Tide | 12:54PM0.73m | 1:11AM0.91m | 1:43PM0.50m | 2:01AM0.66m | 2:29PM0.33m | 2:49AM0.44m | 3:15PM0.25m | 3:37AM0.28m | 4:02PM0.26m | 4:27AM0.20m | 4:50PM0.36m | 5:19AM0.23m | 5:40PM0.52m | ||||||||
 | |  | | |  |  | | |  | |  | | |  | | | | |  | | |
 | 5:22 | — | — | 5:20 | — | — | 5:18 | — | — | 5:18 | — | — | 5:16 | — | — | 5:15 | — | — | 5:13 | — | — |
 | — | — | 9:02 | — | — | 9:05 | — | — | 9:06 | — | — | 9:07 | — | — | 9:08 | — | — | 9:10 | — | — | 9:13 |
2 | 2 | — | 2 | 1 | — | — | — | — | — | — | 5 | — | 1 | 7 | 1 | — | 3 | 1 | — | 1 | |
Temp °C | 10 | 11 | 8 | 9 | 11 | 8 | 10 | 10 | 8 | 11 | 11 | 9 | 10 | 11 | 9 | 11 | 11 | 11 | 12 | 12 | 12 |
1 | 3 | 1 | 2 | 6 | 5 | 3 | 3 | 4 | 7 | 7 | 6 | 6 | 6 | 4 | 7 | 7 | 8 | 9 | 7 | 8 | |
Swell 1 Height (m) Direction Period (s) | — | WSW 7 | WSW 6 | W 16 | W 15 | NW 6 | W 14 | W 14 | NW 4 | NW 5 | — | WSW 4 | WSW 3 | WNW 3 | — | — | — | WSW 7 | WSW 9 | — | — |
 kJ | — | 41 | 4 | 5 | 4 | 23 | 4 | 4 | 2 | 1 | — | 2 | 1 | 1 | — | — | — | 81 | 70 | — | — |
Swell 2 Height (m) Direction Period (s) | — | W 16 | W 16 | — | — | — | — | — | NW 6 | — | W 6 | — | W 8 | SW 6 | — | — | — | — | — | — | — |
| kJ | — | 5 | 5 | — | — | — | — | — | 1 | — | 1 | — | 1 | 2 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 14 | — | — | — | — | — | — | — | W 12 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 4 | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 7 | NW 6 | NW 6 | NW 6 | NW 6 | NW 6 | NW 6 | NW 5 | — | — | — | — | NW 3 | WSW 4 | SW 5 | SW 5 | SW 4 | SSW 7 | SW 9 | SW 9 | SW 8 |
| kJ | 278 | 89 | 161 | 130 | 89 | 34 | 23 | 53 | — | — | — | — | 2 | 1 | 43 | 46 | 26 | 185 | 249 | 246 | 284 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 595 | 572 | 292 | 287 | 388 | 137 | 333 | 301 | 60 | 282 | 285 | 282 | 141 | 286 | 285 | 179 | 262 | 1 | 128 | 294 | 248 |
Best forecast wave conditions in Mid Wales | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 Llandanwg 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 Llandanwg Surf forecast
The above surf forecast table for Llandanwg provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Llandanwg can be found by selecting the local surf guide option on the grey menu. Our Llandanwg 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 (Llandanwg) 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 Llandanwg 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.
Llandanwg is 10 km (6 miles) from Porthmadog. If you plan a holiday in Mid Wales, look for hotels and other accommodation in Porthmadog. Porthmadog has rooms for a wide range of budgets as well as car hire and transport links.
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