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Porth Ceriad Surf Forecast
/ Wales – Lleyn (14 surf breaks) /
Surf Forecasts:
Porth Ceriad surfForecast / Wales – Lleyn / UK
12 Day Weather and Surf, issued 6 am Wednesday 17 Sep 2025 BST
Best Forecast Surf Conditions for Porth Ceriad this week:
The surf forecast for Porth Ceriad over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 19) at 10PM. The primary swell is predicted to be 1.3m and 9s period with a secondary swell of 0.1m and 16s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Porth Ceriad in the next 12 days are 2.5m 8s and forecast to arrive on Wednesday (Sep 17) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Saturday (Sep 20) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Fri 19th Sep) | 4.5ft (1.3m) 9s |
| Best Surf | 10PM (Fri 19th Sep) | 4.5ft (1.3m) 9s |
| Most Powerful | 10AM (Wed 17th Sep) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Porth Ceriad over the next 12 days.
Short Range Forecast Heavy rain (total 23mm), heaviest during Fri night. Very mild (max 18°C on Fri morning, min 14°C on Fri night). Winds decreasing (strong winds from the SW on Wed morning, calm by Fri night). | Days 3-6 Weather Summary Heavy rain (total 33mm), heaviest during Sat morning. Very mild (max 16°C on Sat morning, min 9°C on Sat night). Winds decreasing (severe gales from the NW on Sat night, light winds from the NNE by Sun night). | ||||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | |||||||||||||||
| 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) (?) | 8 | 9 | 7 | 6 | 7 | 7 | 7 | 7 | 9 | 9 | 9 | 8 | 8 | 14 | 13 | 13 | 13 | 13 | 12 | 12 | 12 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 886 | 870 | 296 | 171 | 489 | 368 | 336 | 231 | 199 | 62 | 37 | 17 | 8 | 8 | 7 | 7 | 7 | 3 | 3 | 3 | 3 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | on | glass | on | cross- on | cross- off | off | off | off | off | off | off | off | off | cross- off |
High Tide / height (m) | 5:48PM 3.35 | 6:29AM 3.24 | 6:49PM 3.68 | 7:20AM 3.54 | 7:36PM 4.02 | 8:01AM 3.82 | 8:16PM 4.29 | 8:38AM 4.05 | 8:53PM 4.47 | 9:12AM 4.21 | 9:27PM 4.55 | 9:45AM 4.28 | 10:01PM 4.51 | ||||||||
Low Tide / height (m) | 12:45PM 1.24 | 1:24AM 0.83 | 1:45PM 0.94 | 2:17AM 0.53 | 2:31PM 0.67 | 2:59AM 0.31 | 3:10PM 0.48 | 3:35AM 0.19 | 3:43PM 0.36 | 4:06AM 0.16 | 4:13PM 0.33 | 4:34AM 0.22 | 4:40PM 0.36 | ||||||||
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | |||||||||||||||
| Sunrise | 6:54 | - | - | 6:56 | - | - | 6:56 | - | - | 6:58 | - | - | 7:01 | - | - | 7:01 | - | - | 7:03 | - | - |
| Sunset | - | 7:29 | - | - | 7:27 | - | - | 7:24 | - | - | 7:22 | - | - | 7:20 | - | - | 7:16 | - | - | 7:15 | - |
 |  |  |  | |  | | |  |  | | | | |  |  | | | | |  | |
Rain (mm) | - | - | 4 | 2 | - | - | - | - | 17 | 20 | 2 | 11 | - | - | - | - | - | - | - | - | - |
| Temp. °C | 17 | 16 | 15 | 16 | 17 | 17 | 18 | 18 | 15 | 16 | 14 | 10 | 11 | 12 | 12 | 12 | 13 | 13 | 13 | 15 | 15 |
| Feels °C (?) | 10 | 9 | 9 | 10 | 11 | 12 | 14 | 14 | 15 | 10 | 3 | -6 | 2 | 4 | 6 | 6 | 7 | 8 | 8 | 13 | 13 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Wales - Lleyn
The wind is still cross-on at Porth Ceriad (gales from the SW at Aberdaron 15 km from Porth Ceriad). A 2.4m swell from the SW
1 h 24 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 Porth Ceriad 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 Porth Ceriad Surf forecast
The above surf forecast table for Porth Ceriad provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Porth Ceriad can be found by selecting the local surf guide option on the grey menu. Our Porth Ceriad 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 (Porth Ceriad) 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 Porth Ceriad 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.
Porth Ceriad is 29 km (18 miles) from Porthmadog. If you plan a holiday in Lleyn Peninsula, 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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