Surf Forecasts:
Porth Ceriad surf forecast from 28 Aug 2026:
- Most powerful swell: Sunday 30 Aug, 1AM (local time) - 5ft (1.6m), 9s period, W swell with 459 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 1.6m 9s and forecast to arrive on Sunday (Aug 30) at 1AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Saturday (Aug 29) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Sun 30th Aug) | 5ft (1.6m) 9s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, Rusty here, and I’ve got the goods on Porth Ceriad. Let’s cut through the chatter and get into it.
Right off the bat, I’ll be straight with you – it’s a tough run ahead. The first few days are a write-off. We’re looking at a solid gap of about a week with no real surf on offer. The swell is tiny and the wind is a mess. From Friday the 28th through to Thursday the 3rd of September, it’s all poor surf conditions. Onshore winds, chop, and barely a ripple worth paddling for. The combined energy is weak, barely hitting 150 (moderate) at best on the Monday afternoon, but it’s lumpy and cross-onshore, so no good for a paddle.
The first real flicker of hope comes on Friday the 4th of September. The morning session shows a 4ft swell from the WSW, with a clean cross-offshore breeze from the west at 9 mph. The combined energy hits 144 (moderate), and while the conditions are described as "surfable but very ordinary," it’s the first window where you might get a few soft ones. The water temp is about average for this time of year, so nothing unusual there.
Now, the real standout – and I mean the only one worth circling on the calendar – is Wednesday the 9th of September. But hold your horses. The swell is pumping: 8ft to 10ft from the SW, with a period of 7 to 9 seconds. That’s a solid, punchy groundswell, but it’s going to be powerful. The combined energy goes ballistic – 742 and 1343 (strong to very strong). This is expert territory. The wind is howling out of the south at 25 to 31 mph, onshore, so it’s going to be messy and ugly. This is a case where the size is there, but the quality is shot. For a beginner, this is a definite no-go. For a seasoned charger, it’s a mission, but conditions are bleak. Honestly, with that much wind and swell, this setup looks more interesting for kite surfing than paddle surfing.
The rest of the outlook is a mix of small, clean days with barely any energy – like the 8th of September with a glassy 1ft swell and 7 energy – and then a few more clean offshore days on the 6th and 7th, but the swell is tiny (3ft to 1ft). It’s clean, but you’ll be hunting for knee-high runners.
If you’re a beginner, this whole 16-day window is a wash. The only consistent break here is Porth Ceriad itself, and it’s a fairly consistent spot, but the surf quality just isn’t there. Don’t hold your breath; the forecasts can change, but right now, the surf is flat and the wind is cruel.
Rusty.
Short Range ForecastHeavy rain (total 22mm), heaviest during Sat morning. Very mild (max 18°C on Sat morning, min 15°C on Sat night). Winds increasing (light winds from the WSW on Thu night, fresh winds from the WNW by Sat afternoon). | Days 4-6 Weather SummaryModerate rain (total 14mm), heaviest on Sun night. Very mild (max 17°C on Mon night, min 13°C on Tue night). Winds decreasing (strong winds from the WNW on Sun night, light winds from the W by Wed morning). | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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 6 | SW 6 | SW 5 | SW 6 | SW 7 | W 9 | SW 9 | SW 5 | WSW 8 | SW 9 | WSW 8 | SW 5 | SW 5 | SW 5 | WSW 6 | SW 6 | SW 6 | SW 6 | WSW 7 | WSW 7 | SW 7 |
Wave Graph | |||||||||||||||||||||
6 | 10 | 68 | 54 | 116 | 459 | 123 | 80 | 292 | 84 | 120 | 35 | 47 | 90 | 40 | 15 | 11 | 178 | 150 | 86 | 65 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | on | cross-on | cross | on | on | cross | cross-off | cross-on | cross-on | cross-on | cross-on | cross-off | off | cross-on | on | cross-on | cross-on | cross |
High Tide | 9:08AM3.98m | 9:23PM4.45m | 9:41AM4.17m | 9:56PM4.61m | 10:14AM4.29m | 10:31PM4.67m | 10:49AM4.33m | 11:07PM4.61m | 11:27AM4.26m | 11:46PM4.43m | 12:07PM4.09m | 00:30AM4.13m | 12:53PM3.82m | 1:20AM3.76m | |||||||
Low Tide | 4:01AM0.34m | 4:07PM0.40m | 4:34AM0.22m | 4:39PM0.34m | 5:06AM0.19m | 5:11PM0.35m | 5:39AM0.26m | 5:43PM0.44m | 6:11AM0.42m | 6:15PM0.60m | 6:44AM0.65m | 6:48PM0.80m | 7:21AM0.92m | 7:31PM1.04m | |||||||
6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | |
— | 8:16 | — | — | 8:14 | — | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:05 | — | — | 8:02 | — | |
mm | — | — | 4 | 7 | — | 1 | 3 | 5 | 6 | — | — | 4 | — | 4 | — | — | — | 3 | — | — | 7 |
Temp °C | 17 | 17 | 17 | 18 | 18 | 16 | 18 | 16 | 16 | 15 | 16 | 17 | 16 | 17 | 16 | 13 | 14 | 17 | 17 | 18 | 18 |
Feels °C | 16 | 16 | 14 | 16 | 16 | 13 | 13 | 11 | 10 | 10 | 11 | 12 | 10 | 11 | 11 | 10 | 10 | 13 | 14 | 11 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | — | SW 6 | — | — | NW 4 | NW 4 | SW 8 | SW 9 | WSW 8 | SW 5 | — | — | WSW 6 | SW 6 | — | — | SW 14 | SW 15 | SW 14 |
6 | 10 | — | 54 | — | — | 4 | 1 | 205 | 84 | 120 | 35 | — | — | 40 | 15 | — | — | 8 | 8 | 8 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | NW 4 | — | SW 11 | — | NW 5 | SW 8 | — | — | W 16 | — | W 16 | — | — | — | W 15 |
— | — | — | — | — | — | 1 | — | 5 | — | 30 | 15 | — | — | 5 | — | 5 | — | — | — | 4 | |
Swell 3 Height (m) Direction Period (s) | W 12 | — | — | — | — | — | — | — | — | — | — | NW 4 | — | — | — | W 16 | — | — | — | — | — |
3 | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | 5 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SSW 3 | WSW 2 | SW 5 | SSE 3 | SW 7 | W 9 | SW 9 | SW 5 | WSW 8 | WNW 5 | NW 5 | — | SW 5 | SW 5 | — | — | SW 6 | SW 6 | WSW 7 | WSW 7 | SW 7 |
1 | 1 | 68 | 10 | 116 | 459 | 123 | 80 | 292 | 109 | 19 | — | 47 | 90 | — | — | 11 | 178 | 150 | 86 | 65 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 307 | 317 | 307 | 49 | 360 | 3 | 201 | 314 | 319 | 262 | 254 | 201 | 252 | 460 | 125 | 113 | 294 | 46 | 267 | 298 | 303 |
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.











