Surf Forecasts:
Porth Ceriad surf forecast from 1 Sep 2026:
- Most powerful swell: Thursday 3 Sep, 1AM (local time) - 6ft (1.9m), 7s period, SW swell with 314 kJ wave energy.
Best Forecast Surf Conditions for Porth Ceriad this week:
The most powerful waves expected at Porth Ceriad in the next 16 days are 1.9m 7s and forecast to arrive on Thursday (Sep 03) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Friday (Sep 04) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Thu 3rd Sep) | 6ft (1.9m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright folks, Rusty here.
I gotta level with you: the next week and a bit is pretty grim. We've only got one spot, Porth Ceriad, and she's taking a beating for a long stretch. We're looking at a big gap of poor conditions from now until nearly the end of that 16-day window.
From Tuesday the 1st right through to Thursday the 10th of September, it’s sloppy. Strong cross-onshore winds, lumpy water, and a lot of rain and clouds. Sure, the swell shows up, but it’s raw and ugly. On the 8th, the combined energy jumps to a moderate 423, with 7ft swell from the WSW, but a fresh cross-onshore wind ruins the party. By the morning of the 9th, a near-gale from the SSW at 31 mph blows it all to pieces with 8ft swell. That’s not for a surfboard; you’d want a kite for that kind of mess.
After that long, bleak run, we finally get a little something.
Friday the 11th of September is the one. The afternoon brings a clean 5ft groundswell from the SW with a period of 7 seconds, and the wind swings offshore from the NNW at just 6 mph. It’s clean, it’s rideable, and the combined energy is a moderate 211. For the first time in the whole forecast, the stars line up. That offshore breeze will have the waves looking glassy. That’s your window.
Saturday the 12th and Monday the 14th offer tiny, clean leftovers, but the size drops right off. By Tuesday the 15th of September, there’s a little pulse of very long-period swell (12 seconds) from the WSW, but it’s only 1ft. The energy is weak at 63, so it’s just a longboard kind of day.
Stick a pin in Friday the 11th. That’s the day to be at Porth Ceriad. Everything else in this 16-day outlook is a fight against the wind or waiting for those weak, clean dribblers.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Wed morning. Warm (max 20°C on Wed night, min 15°C on Mon night). Winds increasing (light winds from the WSW on Mon night, strong winds from the SSW by Thu afternoon). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Thu night. Very mild (max 19°C on Sun afternoon, min 14°C on Thu night). Winds decreasing (strong winds from the SW on Thu night, light winds from the S by Sun morning). | ||||||||||||||||||||
Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | |||||||||||||||
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 4 | SW 5 | SW 5 | SSW 5 | SW 6 | SW 7 | SW 6 | SW 5 | WSW 7 | WSW 5 | WSW 5 | SW 6 | SW 6 | SW 6 | SW 13 | SSW 4 | SSW 5 | SW 6 | SW 6 | WSW 11 | WSW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 23 | 35 | 28 | 87 | 172 | 314 | 132 | 126 | 259 | 100 | 80 | 29 | 17 | 8 | 7 | 12 | 19 | 36 | 15 | 13 | 22 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross-off | cross | cross-on | on | on | on | on | cross-on | off | on |
High Tide | 11:27AM4.26m | 11:46PM4.43m | 12:07PM4.09m | 00:30AM4.13m | 12:53PM3.82m | 1:20AM3.76m | 1:48PM3.50m | 2:24AM3.37m | 3:01PM3.24m | 3:49AM3.13m | 4:32PM3.23m | 5:21AM3.19m | 5:54PM3.50m | ||||||||
Low Tide | 6:11AM0.42m | 6:15PM0.60m | 6:44AM0.65m | 6:48PM0.80m | 7:21AM0.92m | 7:31PM1.04m | 8:15AM1.21m | 8:50PM1.27m | 9:45AM1.42m | 10:41PM1.35m | 11:30AM1.41m | 00:19AM1.15m | 12:52PM1.16m | 1:31AM0.77m | |||||||
 |  |  |  |  |  | |  | | | |  | | | | | | | | | | |
 | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:37 | — | — |
 | — | 8:07 | — | — | 8:05 | — | — | 8:02 | — | — | 8:00 | — | — | 7:58 | — | — | 7:55 | — | — | 7:52 | — |
mm | — | 2 | 4 | 6 | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 17 | 17 | 16 | 18 | 20 | 18 | 18 | 18 | 15 | 17 | 15 | 14 | 14 | 14 | 16 | 19 | 19 | 18 | 17 | 17 |
Feels °C | 12 | 12 | 14 | 11 | 14 | 16 | 15 | 12 | 11 | 7 | 11 | 8 | 11 | 11 | 11 | 13 | 15 | 14 | 15 | 15 | 17 |
Swell 1 Height (m) Direction Period (s) | — | — | W 16 | W 16 | W 16 | — | SW 14 | — | WSW 7 | — | NW 5 | SW 6 | NW 5 | SW 6 | WSW 6 | SW 13 | SW 13 | SW 12 | SW 6 | WSW 11 | WSW 11 |
| kJ | — | — | 5 | 5 | 5 | — | 8 | — | 259 | — | 11 | 29 | 11 | 8 | 3 | 7 | 6 | 6 | 11 | 13 | 22 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 14 | — | — | SW 14 | SW 6 | NW 4 | SW 13 | W 7 | W 8 | — | WSW 12 | WSW 4 | — |
| kJ | — | — | — | — | — | — | — | — | 8 | — | — | 8 | 17 | 3 | 7 | 1 | 1 | — | 15 | 2 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 | SW 13 | — | W 13 | — | — | W 9 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 7 | 7 | — | 3 | — | — | 2 | — | — |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 5 | SW 5 | SSW 5 | SW 6 | SW 7 | SW 6 | SW 5 | — | WSW 5 | WSW 5 | NW 5 | — | — | S 2 | SSW 4 | SSW 5 | SW 6 | NW 4 | NW 4 | SW 3 |
| kJ | 23 | 35 | 28 | 87 | 172 | 314 | 132 | 126 | — | 100 | 80 | 30 | — | — | 1 | 12 | 19 | 36 | 12 | 5 | 5 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 246 | 267 | 246 | 301 | 298 | 334 | 252 | 354 | 3 | 494 | 494 | 271 | 141 | 252 | 125 | 199 | 186 | 134 | 126 | 126 | 33 |
Best forecast wave conditions in Lleyn Peninsula | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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