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Llandanwg surfForecast / Wales – Mid / UK
12 Day Weather and Surf, issued 5 am Tuesday 09 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
8.7° C
(Which is 1.9°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 Monday (Dec 15) at 9PM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.3m and 13s. Another secondary swell of 0.4m and 3s 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 12 days are 3.0m 14s and forecast to arrive on Tuesday (Dec 09) at 6PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 3s period and expected on Thursday (Dec 11) at 9PM.
| Wave Type | Time (GMT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 15th Dec) | 2.5ft (0.7m) 8s |
| Best Surf | 9AM (Tue 16th Dec) | 6.5ft (2.0m) 7s |
| Most Powerful | 6PM (Tue 9th Dec) | 10ft (3.0m) 14s |
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 25mm), heaviest during Tue morning. Very mild (max 14°C on Tue morning, min 8°C on Thu night). Winds decreasing (near gales from the SSW on Tue afternoon, light winds from the WSW by Thu night). | Days 3-6 Weather Summary Some drizzle, heaviest during Fri afternoon. Very mild (max 10°C on Fri morning, min 8°C on Fri morning). Winds increasing (light winds from the SSW on Fri morning, fresh winds from the SW by Sat morning). | ||||||||||||||||||||
Tuesday 09 | Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | |||||||||||||||
| 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) (?) | 11 | 12 | 13 | 12 | 12 | 11 | 8 | 10 | 13 | 13 | 13 | 11 | 5 | 6 | 7 | 8 | 8 | 8 | 8 | 8 | 8 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 1154 | 2426 | 2231 | 1278 | 889 | 503 | 335 | 589 | 946 | 440 | 351 | 109 | 64 | 98 | 200 | 244 | 250 | 171 | 119 | 169 | 68 |
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- on | on | on | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- off |
High Tide / height (m) | 10:48AM 4.32 | 11:17PM 3.64 | 11:39AM 4.01 | 12:11AM 3.31 | 12:36PM 3.70 | 1:14AM 3.05 | 1:41PM 3.43 | 2:29AM 2.94 | 2:55PM 3.28 | 3:42AM 2.99 | 4:04PM 3.26 | 4:42AM 3.14 | 5:01PM 3.32 | ||||||||
Low Tide / height (m) | 6:20PM 0.52 | 6:28AM 0.94 | 7:14PM 0.73 | 7:20AM 1.13 | 8:10PM 0.92 | 8:17AM 1.28 | 9:08PM 1.06 | 9:19AM 1.38 | 10:09PM 1.14 | 10:26AM 1.39 | 11:08PM 1.16 | 11:31AM 1.32 | 12:02AM 1.12 | ||||||||
Tuesday 09 | Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | |||||||||||||||
| Sunrise | 8:15 | - | - | 8:17 | - | - | 8:18 | - | - | 8:18 | - | - | 8:19 | - | - | 8:21 | - | - | 8:22 | - | - |
| Sunset | - | 4:00 | - | - | 4:00 | - | - | 4:00 | - | - | 4:00 | - | - | 4:00 | - | - | 4:00 | - | - | 4:00 | - |
 |  |  | |  |  | | | |  | |  | | | | |  | | | | | |
Rain (mm) | 10 | 2 | 3 | 3 | - | - | - | - | 7 | - | 1 | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 14 | 12 | 11 | 10 | 10 | 10 | 11 | 11 | 12 | 10 | 10 | 9 | 10 | 10 | 10 | 9 | 10 | 10 | 12 | 12 | 11 |
| Feels °C (?) | 7 | 0 | 1 | 3 | 3 | 4 | 4 | 5 | 5 | 5 | 5 | 4 | 2 | 3 | 3 | 3 | 3 | 4 | 7 | 8 | 8 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
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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