Surf Forecasts:
Porth Ceriad surf forecast from 28 Aug 2026:
- Best quality surf: Saturday 29 Aug, 10PM (local time) - 2.5ft (0.7m), 8s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 10PM (local time) - 7ft (2.1m), 7s period, SW swell with 393 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 10PM (local time) - 2.5ft (0.7m), 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 Saturday (Aug 29) at 10PM. The primary swell is predicted to be 0.7m and 8s 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 Wednesday (Sep 02) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Saturday (Sep 05) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sat 29th Aug) | 2.5ft (0.7m) 8s |
| Best Surf | 10PM (Sat 29th Aug) | 2.5ft (0.7m) 8s |
| Most Powerful | 10PM (Wed 2nd Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
G’day, Rusty here, and I’ve got a look at the surf coming up for Porth Ceriad. Truth be told, it’s a tough stretch ahead. We’re starting with a real dry spell, and the first few days are basically a write-off for a proper paddle.
The forecast kicks off on Friday the 28th of August, but there’s nothing worth getting wet for. The swell is tiny at 1 feet from the SW with a weak 6-second period, and that cross-on wind from the SW at 12 mph is making a mess of things. The combined swell energy is a puny 13, so it’s flat and choppy. The water is running at 66°, which is a massive 6° warmer than normal for this time of year – that’s really unusual, almost like a warm bath, but it won’t make up for the lack of waves.
We’ve got a solid gap of nothing happening for the first week. Saturday the 29th has a brief moment on the afternoon with a clean offshore wind from the N at 6 mph, but the swell is only 2 feet, and the energy is a pathetic 18. It’s too small to ride. Sunday the 30th brings a bit more size – 3 feet SW swell with a 9-second period, and energy hits 172 – but it’s a risk of thunderstorms with strong onshore wind. Not worth it.
The whole week rolls on like this: Monday the 31st has a 2 feet SW swell with clean winds, but it’s ordinary. Tuesday the 1st of September is cross-on and lumpy. Wednesday the 2nd sees 6 feet SW swell with a 6-second period and 28 mph winds – that’s a messy, strong cross-on blow, and the energy is 244, but it’s just a washing machine. Thursday through Saturday are all in the same boat: cross-shore winds, short period, and poor conditions.
Now, the standout, and I mean the only real highlight, is on Tuesday the 8th of September. The morning is a write-off – 12 feet WSW swell at 10 seconds, but cross winds at 22 mph make it lumpy. But the afternoon, that’s the one. The swell is 12 feet from the WSW, period stretching to 11 seconds, and the wind is a clean offshore from the NW at 25 mph. The combined swell energy is a massive 2772 – that’s powerful, proper groundswell energy. The wind and tide are favorable, but listen, this is for experts only. At 12 feet, it’s way too big for beginners. This is a serious, heavy wave. For a spot like Porth Ceriad, which is exposed to the SW, that’s a lot of water moving. It’ll be a sight to see, but only the most experienced should even think about paddling out.
After that, Wednesday the 9th drops right back to tiny 2 feet and 2 feet with no energy, and the rest of the week into the 12th is just onshore rubbish with small swell. That one day, the 8th of September afternoon, is the only true standout, and it’s a big one. Keep your eyes on that, but respect the size.
Stay safe out there.
Rusty.
Short Range ForecastHeavy rain (total 26mm), heaviest during Sat morning. Very mild (max 17°C on Fri afternoon, min 15°C on Sun morning). Winds increasing (light winds from the N on Sat afternoon, fresh winds from the S by Sun afternoon). | Days 5-7 Weather SummaryModerate rain (total 18mm), heaviest on Tue night. Very mild (max 18°C on Wed morning, min 15°C on Mon afternoon). Winds increasing (calm on Tue night, strong winds from the SW by Wed morning). | |||||||||||||||||||
Fri 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
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 5 | SW 6 | SW 6 | SW 10 | SW 9 | SSW 5 | SW 8 | WSW 9 | SW 9 | SW 5 | SW 6 | SW 6 | WSW 6 | SW 6 | SW 6 | WSW 7 | WSW 5 | SW 5 | SW 6 |
Wave Graph | ||||||||||||||||||||
10 | 53 | 36 | 18 | 157 | 142 | 59 | 138 | 138 | 77 | 25 | 34 | 26 | 65 | 40 | 244 | 263 | 87 | 56 | 133 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | off | cross-on | on | on | cross-on | cross-off | cross-off | cross | cross-on | cross-on | on | cross-on | cross-on | cross | cross | cross | cross |
High Tide | 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 | 4:07PM0.40m | 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 | |||||||
— | — | 6:22 | — | — | 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 | — | 3 | 8 | 2 | 1 | 6 | 4 | 2 | — | — | — | — | 1 | 7 | 6 | 1 | 1 | 2 | — | — |
Temp °C | 17 | 17 | 16 | 17 | 16 | 16 | 16 | 16 | 15 | 16 | 16 | 16 | 17 | 17 | 18 | 17 | 17 | 16 | 17 | 16 |
Feels °C | 15 | 14 | 13 | 14 | 15 | 12 | 10 | 13 | 10 | 13 | 12 | 12 | 12 | 17 | 11 | 11 | 11 | 9 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 6 | — | SW 6 | SW 6 | SW 10 | WSW 9 | SW 8 | — | WSW 9 | SW 9 | SW 8 | — | NW 4 | W 16 | — | — | W 15 | — | NW 4 | SW 15 |
10 | — | 36 | 18 | 157 | 30 | 18 | — | 138 | 77 | 16 | — | 2 | 5 | — | — | 4 | — | 7 | 8 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | NW 3 | — | — | — | WSW 6 | NW 5 | NNW 4 | — | — | — | W 16 | — | — | — | — | — |
— | — | — | — | 2 | — | — | — | 18 | 25 | 2 | — | — | — | 5 | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | W 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | SW 5 | SE 2 | NNE 2 | — | SW 9 | SSW 5 | SW 8 | NW 5 | WNW 5 | SW 5 | SW 6 | SW 6 | WSW 6 | SW 6 | SW 6 | WSW 7 | WSW 5 | SW 5 | SW 6 |
— | 53 | 1 | 1 | — | 142 | 59 | 138 | 83 | 17 | 25 | 34 | 26 | 65 | 40 | 244 | 263 | 87 | 56 | 133 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 317 | 307 | 307 | 126 | 3 | 201 | 201 | 60 | 120 | 0 | 126 | 267 | 385 | 252 | 301 | 639 | 262 | 1029 | 494 | 262 |
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.











