Surf Forecasts:
Porth Ceriad surf forecast from 14 Sep 2026:
- Best quality surf: Saturday 19 Sep, 10PM (local time) - 5ft (1.6m), 7s period, WSW swell with cross-offshore winds.
- Most powerful swell: Saturday 19 Sep, 4PM (local time) - 7ft (2.1m), 7s period, SW swell with 428 kJ wave energy.
- Next surfable swell (1★+): Saturday 19 Sep, 10PM (local time) - 5ft (1.6m), 7s period with WSW 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 Saturday (Sep 19) at 10PM. The primary swell is predicted to be 1.6m 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 Saturday (Sep 19) 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 1.3m 5s period and expected on Wednesday (Sep 16) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sat 19th Sep) | 5ft (1.6m) 7s |
| Best Surf | 10PM (Sat 19th Sep) | 5ft (1.6m) 7s |
| Most Powerful | 4PM (Sat 19th Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Right off the bat, the next week and a half is looking pretty grim for Porth Ceriad. There’s a whole lot of nothing on offer, with onshore and cross-shore winds chopping up what little swell is out there. You’d be scratching your head trying to find anything rideable until the 20th, and even then, it’s only a tiny 2ft of weak, short-period swell. That Sunday morning glass is a tease, but the energy is just pitiful. The following days stay tiny and messy, with a bit more swell on the 21st but ruined by a fresh cross-onshore breeze.
Then, things finally wake up on the 22nd. The morning brings a solid 6ft of W swell with a moderate offshore wind, and the combined energy jumps to a moderate 264. That’s the one real window where it’ll be clean, lined up, and worth getting wet. But the window is short-lived—afternoon drops off to nothing and the days after are back to knee-high mush.
We’ve got a longer wait for the next proper pulse. The 27th sees a big 8ft of SW swell roll in, pushing the combined energy up to a strong 662 in the morning and a very strong 952 by the afternoon. That’s serious size, and with a period of 7-8 seconds, it won’t be the cleanest. For Porth Ceriad, a beach setup, this is definitely expert territory—over 8ft is too much for most. The gentle cross-onshore will keep it a bit lumpy, so don’t be fooled by the size; it’s going to be a grindy, powerful mess. After that, it fades fast.
So, in short: one standout on the 22nd for clean, manageable waves, and a big, raw session for experts only on the 27th. Everything else is a flat, wind-blown write-off. You gotta pick your moments.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Mon night. Very mild (max 17°C on Sun night, min 13°C on Tue night). Winds decreasing (fresh winds from the SSW on Mon afternoon, light winds from the W by Tue afternoon). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Wed night. Very mild (max 17°C on Fri night, min 13°C on Thu night). Mainly strong winds. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 5 | SW 6 | W 6 | W 5 | SW 6 | WSW 6 | NW 5 | SW 5 | WSW 6 | WSW 6 | W 6 | W 6 | SW 6 | SW 6 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 28 | 68 | 239 | 144 | 82 | 31 | 14 | 4 | 67 | 170 | 167 | 191 | 164 | 123 | 207 | 342 | 428 | 119 | 37 | 21 | 10 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross | cross | cross-off | cross-off | cross | cross-on | cross-off | cross | cross-off | cross | cross-on | cross | cross | cross-on | cross-off | off | glassy | on |
High Tide | 10:46AM4.37m | 11:05PM4.46m | 11:22AM4.16m | 11:41PM4.11m | 11:57AM3.87m | 00:18AM3.70m | 12:34PM3.53m | 00:57AM3.28m | 1:15PM3.17m | 1:45AM2.89m | 2:13PM2.85m | 3:05AM2.60m | 4:04PM2.70m | ||||||||
Low Tide | 5:34AM0.22m | 5:41PM0.37m | 6:02AM0.51m | 6:10PM0.60m | 6:28AM0.82m | 6:38PM0.87m | 6:53AM1.13m | 7:13PM1.16m | 7:27AM1.41m | 8:05PM1.45m | 8:28AM1.66m | 9:31PM1.65m | 10:10AM1.77m | 11:24PM1.64m | |||||||
 |  |  |  | |  | | | | | | | |  | | | |  | | | | |
 | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — |
 | — | 7:37 | — | — | 7:34 | — | — | 7:31 | — | — | 7:29 | — | — | 7:27 | — | — | 7:24 | — | — | 7:22 | — |
mm | — | — | 5 | — | — | — | — | — | 1 | — | — | — | — | 1 | 1 | — | — | — | — | — | — |
Temp °C | 17 | 17 | 17 | 14 | 17 | 16 | 14 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 17 | 16 | 17 | 15 | 13 | 14 | 17 |
Feels °C | 16 | 12 | 12 | 7 | 15 | 12 | 7 | 10 | 9 | 8 | 9 | 8 | 10 | 9 | 13 | 13 | 13 | 13 | 12 | 12 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 5 | W 12 | — | — | NW 5 | SW 6 | WSW 6 | NW 5 | NNW 5 | — | — | — | — | NW 5 | — | — | — | SW 7 | SW 7 | NW 5 | SW 6 |
| kJ | 28 | 3 | — | — | 25 | 31 | 14 | 4 | 2 | — | — | — | — | 8 | — | — | — | 119 | 37 | 11 | 10 |
Swell 2 Height (m) Direction Period (s) | W 12 | — | — | — | — | WSW 8 | W 9 | — | — | — | — | — | — | — | — | — | — | W 14 | W 14 | SW 7 | NNW 4 |
| kJ | 3 | — | — | — | — | 7 | 7 | — | — | — | — | — | — | — | — | — | — | 4 | 4 | 21 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 14 | W 14 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 4 |
Wind waves Height (m) Direction Period (s) | — | SW 5 | SW 6 | W 6 | W 5 | NW 5 | NW 6 | WNW 5 | SW 5 | WSW 6 | WSW 6 | W 6 | W 6 | SW 6 | SW 6 | SW 7 | SW 7 | NW 5 | NW 5 | — | — |
| kJ | — | 68 | 239 | 144 | 82 | 66 | 96 | 44 | 67 | 170 | 167 | 191 | 164 | 123 | 207 | 342 | 428 | 51 | 35 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 252 | 252 | 262 | 494 | 494 | 141 | 135 | 291 | 307 | 785 | 494 | 126 | 303 | 298 | 303 | 3 | 262 | 3 | 0 | 114 | 229 |
Best forecast wave conditions in Lleyn Peninsula | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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‘Porth Neigwl: Choppy waves hadn't tidied much (from what I could see in the dark.’
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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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