Surf Forecasts:
Porth Ceriad surf forecast from 10 Sep 2026:
- Best quality surf: Friday 11 Sep, 4PM (local time) - 1.5ft (0.5m), 8s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 10 Sep, 4PM (local time) - 7ft (2.1m), 7s period, SW swell with 382 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 4PM (local time) - 1.5ft (0.5m), 8s period with SW swell.
Best Forecast Surf Conditions for Porth Ceriad this week:
The surf forecast for Porth Ceriad over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 11) at 4PM. The primary swell is predicted to be 0.5m and 8s period with a secondary swell of 0.6m and 4s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Porth Ceriad in the next 16 days are 2.1m 7s and forecast to arrive on Thursday (Sep 10) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Wednesday (Sep 16) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Fri 11th Sep) | 1.5ft (0.5m) 8s |
| Best Surf | 4PM (Fri 11th Sep) | 1.5ft (0.5m) 8s |
| Most Powerful | 4PM (Thu 10th Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's be honest, it's been a tough stretch. Looking at the whole 16-day window for Porth Ceriad, there's a massive chunk of nothing happening. We're looking at flat to tiny, junk surf for the better part of two weeks. But there is a little light at the end of the tunnel if you've got the patience.
From Thursday the 10th right on through to Wednesday the 24th of September, it’s a write-off. We've got pulses of swell, sure, like a 7ft SW on the 10th, but the wind is absolutely howling from the south or southwest at 25 mph, shredding everything into a foamy mess. The wave energy is moderate (382) on that one, but it means nothing with that onshore wind. There's a brief moment on the 16th with a clean NNW offshore, but by then the swell has dropped to a paltry 1ft. It’s barely a ripple.
Then, finally, we get a glimmer. The standout, and really the only window to have a crack, is Thursday the 25th and Friday the 26th of September.
Friday morning the 25th sees a 7ft swell from the WSW with a moderate wave energy (350) and a light cross-onshore breeze. It's still not perfect, but it's a massive step up. The real highlight, the one you've been waiting for, is Friday afternoon. The wind goes glassy – slight air, ESE at 3 mph – and we've got a solid 6ft of WSW swell (moderate energy of 286). This is your window. Expect good, clean surf conditions out there. It's going to be perfect for a longboard or a funboard, but at just under 7ft, it's pushing the limits for a raw beginner. For a beginner spot like Porth Ceriad, that's about as good as it gets, though it'll be popular with everyone who's been waiting.
Before that, Thursday the 24th offers some decent swell size (8ft on the afternoon, with strong wave energy of 483), but again, the wind is cross-onshore. That's a call only for the diehards on a bigger board who don't mind the chop.
So, the bottom line: the water is about average for this time of year. Hang tight, the wait is nearly over. The standout glassy window is Friday afternoon the 25th.
Rusty.
Short Range ForecastModerate rain (total 10mm), heaviest on Thu afternoon. Very mild (max 18°C on Thu night, min 14°C on Fri morning). Winds decreasing (strong winds from the SSW on Thu morning, light winds from the WNW by Fri afternoon). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Mon night. Very mild (max 18°C on Mon morning, min 14°C on Tue night). Winds increasing (calm on Sun afternoon, strong winds from the SSW by Mon night). | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | SSW 5 | SW 7 | WSW 7 | SW 7 | SW 8 | SW 4 | SW 6 | SW 7 | WSW 7 | SW 6 | SW 6 | SW 6 | SSW 4 | SW 4 | SW 5 | SW 6 | WSW 6 | WSW 6 | SW 8 | WSW 9 | WSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 88 | 382 | 163 | 50 | 32 | 28 | 326 | 325 | 93 | 34 | 20 | 10 | 13 | 26 | 94 | 71 | 24 | 13 | 16 | 16 | 4 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross | cross-off | cross-off | cross-on | cross-on | cross-on | cross-on | off | cross-off | on | on | cross-on | on | cross | cross | off | off | cross-off | cross-off |
High Tide | 8:30PM4.65m | 8:54AM4.33m | 9:11PM4.83m | 9:33AM4.45m | 9:50PM4.85m | 10:10AM4.47m | 10:28PM4.72m | 10:46AM4.37m | 11:05PM4.46m | 11:22AM4.16m | 11:41PM4.11m | 11:57AM3.87m | 00:18AM3.70m | ||||||||
Low Tide | 3:23PM0.27m | 3:51AM-0.09m | 4:02PM0.14m | 4:29AM-0.11m | 4:37PM0.12m | 5:03AM0.00m | 5:10PM0.20m | 5:34AM0.22m | 5:41PM0.37m | 6:02AM0.51m | 6:10PM0.60m | 6:28AM0.82m | 6:38PM0.87m | ||||||||
 |  |  |  | | | | | |  | |  | | | | |  | | | | | |
 | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — |
 | — | 7:45 | — | — | 7:44 | — | — | 7:40 | — | — | 7:38 | — | — | 7:37 | — | — | 7:34 | — | — | 7:31 | — |
mm | 1 | 2 | 1 | — | — | 1 | 2 | 1 | 2 | — | — | — | — | — | 2 | — | — | — | — | — | — |
Temp °C | 16 | 17 | 18 | 14 | 14 | 16 | 17 | 17 | 18 | 16 | 16 | 16 | 18 | 18 | 18 | 16 | 17 | 15 | 14 | 14 | 15 |
Feels °C | 9 | 11 | 14 | 9 | 13 | 10 | 11 | 13 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 13 | 15 | 12 | 8 | 9 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 8 | — | — | SW 7 | SW 8 | NW 4 | — | — | WSW 7 | SW 6 | SW 6 | SW 6 | WSW 6 | W 8 | W 8 | SW 6 | WSW 6 | WSW 6 | SW 8 | WSW 9 | WSW 6 |
| kJ | 2 | — | — | 50 | 32 | 1 | — | — | 93 | 34 | 20 | 10 | 4 | 1 | 1 | 71 | 24 | 13 | 16 | 16 | 4 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | NW 4 | NW 4 | — | — | — | NW 4 | NNW 4 | NNW 4 | W 12 | W 12 | W 12 | — | W 11 | — | — | — | SW 7 |
| kJ | — | — | — | — | 11 | 1 | — | — | — | 4 | 4 | 2 | 3 | 3 | 3 | — | 2 | — | — | — | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | WNW 4 | — | W 12 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 1 | — | 3 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SW 7 | WSW 7 | NW 4 | — | SW 4 | SW 6 | SW 7 | — | NW 4 | — | — | SSW 4 | SW 4 | SW 5 | NW 4 | NW 4 | NW 5 | NNW 6 | NNW 5 | NNW 4 |
| kJ | 88 | 382 | 163 | 12 | — | 28 | 326 | 325 | — | 11 | — | — | 13 | 26 | 94 | 14 | 24 | 49 | 101 | 77 | 14 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 320 | 427 | 201 | 125 | 0 | 246 | 267 | 143 | 143 | 5 | 126 | 236 | 132 | 267 | 153 | 3 | 1188 | 126 | 174 | 138 | 138 |
Best forecast wave conditions in Lleyn Peninsula | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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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 16 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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