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Llandanwg surfForecast / Wales – Mid / UK
12 Day Weather and Surf, issued 11 am Thursday 18 Dec 2025 GMTForecast 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
9.0° C
(Which is 1.2°C colder than average for this time of year)Best Forecast Surf Conditions for Llandanwg this week:
The surf forecast for Llandanwg over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Dec 21) at 3AM. The primary swell is predicted to be 0.8m and 11s period with a secondary swell of 0.4m and 16s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Llandanwg in the next 12 days are 1.4m 18s and forecast to arrive on Thursday (Dec 18) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 2s period and expected on Sunday (Dec 21) at 12PM.
| Wave Type | Time (GMT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sun 21st Dec) | 2.5ft (0.8m) 11s |
| Best Surf | 3AM (Sun 21st Dec) | 2.5ft (0.8m) 11s |
| Most Powerful | 9PM (Thu 18th Dec) | 4.5ft (1.4m) 18s |
Table - best surf conditions forecast for Llandanwg over the next 12 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Heavy rain (total 20mm), heaviest during Sat night. Very mild (max 10°C on Thu morning, min 7°C on Sat night). Winds decreasing (strong winds from the SW on Thu night, light winds from the SSW by Sat night). | Days 3-6 Weather Summary Light rain (total 5mm), mostly falling on Sun afternoon. Mild temperatures (max 9°C on Sun afternoon, min 4°C on Tue afternoon). Winds decreasing (fresh winds from the ESE on Sun night, light winds from the ENE by Tue afternoon). | ||||||||||||||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 10 | 19 | 6 | 8 | 7 | 7 | 9 | 10 | 11 | 16 | 10 | 5 | 8 | 8 | 6 | 7 | 7 | 8 | 9 | 9 | 9 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 230 | 210 | 143 | 602 | 301 | 178 | 342 | 832 | 200 | 144 | 48 | 36 | 120 | 123 | 39 | 24 | 11 | 10 | 22 | 8 | 8 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- off | cross- off | cross- off | cross | cross | cross- off | cross- off | cross- off | off | off | cross- off | off |
High Tide / height (m) | 7:08PM 3.69 | 7:26AM 3.87 | 7:44PM 3.78 | 8:01AM 3.99 | 8:19PM 3.83 | 8:36AM 4.08 | 8:53PM 3.84 | 9:11AM 4.13 | 9:28PM 3.80 | 9:47AM 4.13 | 10:05PM 3.74 | 10:24AM 4.10 | 10:44PM 3.64 | ||||||||
Low Tide / height (m) | 1:51PM 0.91 | 2:04AM 0.89 | 2:29PM 0.80 | 2:41AM 0.82 | 3:07PM 0.72 | 3:17AM 0.77 | 3:46PM 0.68 | 3:54AM 0.76 | 4:25PM 0.69 | 4:30AM 0.79 | 5:05PM 0.73 | 5:07AM 0.86 | 5:45PM 0.79 | ||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | |||||||||||||||
| Sunrise | 8:23 | - | - | 8:25 | - | - | 8:25 | - | - | 8:26 | - | - | 8:26 | - | - | 8:26 | - | - | 8:26 | - | - |
| Sunset | - | 4:00 | - | - | 4:00 | - | - | 4:00 | - | - | 4:01 | - | - | 4:01 | - | - | 4:02 | - | - | 4:02 | - |
 |  |  | |  | | | |  | | |  |  | | |  | | | | |  | |
Rain (mm) | - | 3 | 2 | 2 | 1 | 1 | - | - | 11 | 2 | 3 | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 9 | 8 | 8 | 8 | 6 | 7 | 7 | 7 | 7 | 6 | 5 |
| Feels °C (?) | 5 | 6 | 1 | 2 | 2 | 3 | 1 | 1 | 2 | 4 | 3 | 2 | 2 | 4 | 2 | 3 | 3 | 2 | 0 | -2 | -3 |
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Ocean Swells (m)- Wind Speed (km/h)
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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.
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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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