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Llandanwg surfForecast / Wales – Mid / UK
12 Day Weather and Surf, issued 6 pm Tuesday 16 Sep 2025 BST
Best Forecast Surf Conditions for Llandanwg this week:
The most powerful waves expected at Llandanwg in the next 12 days are 1.8m 9s and forecast to arrive on Wednesday (Sep 17) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Sunday (Sep 21) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Wed 17th Sep) | 6ft (1.8m) 9s |
Table - best surf conditions forecast for Llandanwg over the next 12 days.
Short Range Forecast Heavy rain (total 40mm), heaviest during Tue night. Very mild (max 18°C on Fri morning, min 13°C on Tue night). Winds decreasing (fresh winds from the SW on Tue night, light winds from the SSW by Wed night). | Days 3-6 Weather Summary Heavy rain (total 46mm), heaviest during Sat afternoon. Very mild (max 18°C on Fri afternoon, min 9°C on Sat night). Wind will be generally light. | ||||||||||||||||||||||
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||
| PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |||
Rating (10 max) | |||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||||
| Period(s) (?) | 6 | 5 | 8 | 9 | 6 | 7 | 8 | 7 | 8 | 9 | 9 | 9 | 9 | 9 | 8 | 14 | 13 | 13 | 13 | 13 | 5 | ||
Wave (?)Graph  | |||||||||||||||||||||||
 kJ (?) | 58 | 55 | 485 | 493 | 124 | 292 | 385 | 231 | 200 | 179 | 84 | 32 | 31 | 19 | 10 | 4 | 4 | 3 | 3 | 3 | 4 | ||
Wind (km/h) | |||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | on | on | on | on | on | cross- on | cross- on | cross- on | on | glass | cross- off | cross- off | cross- off | cross- off | off | off | cross- off | off | off | ||
High Tide / height (m) | 4:13PM 3.14 | 5:10AM 3.00 | 5:42PM 3.34 | 6:23AM 3.24 | 6:43PM 3.68 | 7:13AM 3.53 | 7:30PM 4.01 | 7:54AM 3.81 | 8:09PM 4.28 | 8:31AM 4.03 | 8:46PM 4.45 | 9:05AM 4.19 | 9:20PM 4.53 | 9:38AM 4.26 | |||||||||
Low Tide / height (m) | 12:05AM 1.17 | 12:37PM 1.28 | 1:16AM 0.87 | 1:37PM 0.97 | 2:09AM 0.56 | 2:23PM 0.70 | 2:50AM 0.34 | 3:01PM 0.50 | 3:26AM 0.21 | 3:33PM 0.38 | 3:57AM 0.18 | 4:02PM 0.35 | 4:24AM 0.24 | ||||||||||
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||
| Sunrise | - | - | 6:52 | - | - | 6:54 | - | - | 6:56 | - | - | 6:56 | - | - | 6:58 | - | - | 7:01 | - | - | 7:01 | ||
| Sunset | 7:30 | - | - | 7:28 | - | - | 7:25 | - | - | 7:22 | - | - | 7:21 | - | - | 7:17 | - | - | 7:15 | - | - | ||
 |  | |  |  | | |  |  | |  | |  | |  |  |  | | | | | |||
Rain (mm) | 2 | 26 | 1 | - | 6 | 5 | - | - | - | - | 6 | 3 | 24 | 11 | 2 | - | - | - | - | - | - | ||
| Temp. °C | 14 | 16 | 17 | 17 | 15 | 17 | 17 | 17 | 18 | 18 | 15 | 14 | 13 | 11 | 11 | 12 | 11 | 12 | 13 | 9 | 14 | ||
| Feels °C (?) | 10 | 11 | 12 | 13 | 11 | 13 | 13 | 14 | 15 | 15 | 14 | 13 | 9 | 5 | 6 | 7 | 7 | 8 | 8 | 6 | 12 | ||
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Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Wales - Mid
Continuing clean conditions at Llandanwg (calm at Caernarfon 27 km from Llandanwg). 1.1m 5s windswell from the SW to make surfable waves.
27 km away, 45 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 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 12 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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