Surf Forecasts:
Porth Ceriad surf forecast from 10 Sep 2026:
- Best quality surf: Friday 11 Sep, 1PM (local time) - 2ft (0.6m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 10 Sep, 4PM (local time) - 7ft (2.1m), 7s period, SW swell with 410 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 1PM (local time) - 2ft (0.6m), 7s 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 1PM. The primary swell is predicted to be 0.6m and 7s period. 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 Tuesday (Sep 15) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Fri 11th Sep) | 2ft (0.6m) 7s |
| Best Surf | 1PM (Fri 11th Sep) | 2ft (0.6m) 7s |
| 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 have a proper look at what’s coming down the line for Porth Ceriad.
Right off the bat, I gotta be straight with you – this is a tough run. We’ve got a long, quiet spell ahead with barely a ripple worth mentioning for over a week. The first half of this outlook is a write-off for anyone hoping to get a proper wave. It’s not until we get towards the end of the second week that something finally shows a pulse.
The water temp is about average for this time of year, so no surprises there.
The first sniff of anything decent won't come until Saturday the 20th of September. That’s a full week and a half of waiting. The morning starts to show some promise with a clean 7ft swell from the NW, period around 6 seconds, and a moderate offshore breeze from the NNW at 12 mph. The combined swell energy is moderate at 346. It’s not super long-period groundswell, but for this spot, a clean 7ft with offshore wind is a total game-changer. The wind stays favorable in the afternoon, backing off to a gentle cross-off breeze, keeping the waves clean. This is the standout window.
But here’s the thing – before you get too excited, remember that Porth Ceriad can get often crowded on days like that. So if you’re keen, get in early. For a beginner-friendly break, 7ft is right at the upper limit, so it’s got some punch but is still manageable for the more adventurous learner. The exposed SW-facing orientation means it’s gonna catch that NW swell just fine.
Beyond that Sunday the 21st? It falls apart again. The wind swings onshore, the swell drops, and we’re back to messy, choppy conditions. The rest of the run through to the 25th of September is just more of the same – onshore slop and small, weak waves.
So to sum it up: if you can wait, Saturday the 20th of September is your day. A clean, offshore swell with some moderate energy. That’s the only real highlight in a very long, quiet period.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Thu afternoon. Very mild (max 18°C on Thu night, min 14°C on Wed night). 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 9mm), mostly falling on Tue morning. Very mild (max 18°C on Mon morning, min 13°C on Sun morning). Winds increasing (light winds from the WNW on Sun morning, fresh winds from the S 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) | SW 5 | SW 7 | WSW 7 | SW 8 | WSW 8 | SW 4 | SW 6 | SW 7 | SW 7 | SW 6 | SW 6 | SW 6 | SW 5 | SW 6 | SW 6 | SW 6 | WSW 6 | SW 6 | WSW 6 | W 11 | W 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 67 | 410 | 185 | 57 | 44 | 29 | 325 | 347 | 111 | 34 | 20 | 9 | 69 | 141 | 161 | 73 | 25 | 5 | 3 | 2 | 2 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-off | cross-off | cross-off | on | cross-on | cross-on | cross-off | off | cross | on | cross-on | cross-on | on | on | cross-off | cross-off | off | off | cross-off |
High Tide | 8:12AM4.10m | 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 | 2 | — | — | — | — | — | 2 | — | — | 1 | — | — | — | 5 | 1 | 2 | 2 | — | — |
Temp °C | 16 | 17 | 18 | 14 | 14 | 16 | 17 | 18 | 17 | 14 | 14 | 16 | 18 | 18 | 17 | 17 | 18 | 15 | 14 | 14 | 14 |
Feels °C | 9 | 12 | 14 | 10 | 13 | 10 | 11 | 13 | 16 | 13 | 12 | 13 | 15 | 14 | 14 | 12 | 15 | 9 | 7 | 8 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 8 | — | — | SW 8 | WSW 8 | — | — | — | SW 7 | SW 6 | SW 6 | SW 6 | W 12 | W 9 | W 12 | SW 6 | WSW 6 | SW 6 | WSW 6 | SW 6 | NNW 4 |
| kJ | 2 | — | — | 57 | 44 | — | — | — | 111 | 34 | 20 | 9 | 3 | 2 | 3 | 73 | 25 | 5 | 3 | 2 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | NW 4 | NW 4 | — | — | — | W 13 | NNW 5 | NW 4 | W 9 | — | — | — | W 11 | W 11 | — | W 11 | SW 6 |
| kJ | — | — | — | — | 5 | 1 | — | — | — | 3 | 4 | 1 | 2 | — | — | — | 2 | 2 | — | 2 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | WNW 4 | — | — | — | — | — | — | — | — | — | W 9 |
| kJ | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | 2 |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 7 | WSW 7 | NW 4 | — | SW 4 | SW 6 | SW 7 | NW 3 | NNW 5 | — | SW 3 | SW 5 | SW 6 | SW 6 | NW 4 | NW 5 | NW 5 | NW 5 | NW 4 | — |
| kJ | 67 | 410 | 185 | 9 | — | 29 | 325 | 347 | 5 | 19 | — | 2 | 69 | 141 | 161 | 15 | 55 | 82 | 23 | 9 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 320 | 103 | 241 | 126 | 0 | 229 | 267 | 373 | 25 | 113 | 126 | 180 | 252 | 252 | 132 | 236 | 571 | 141 | 290 | 170 | 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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