Surf Forecasts:
Porth Ceriad surf forecast from 28 Aug 2026:
- Best quality surf: Thursday 3 Sep, 10PM (local time) - 5.5ft (1.7m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 10PM (local time) - 8ft (2.4m), 7s period, SW swell with 629 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 1AM (local time) - 3ft (0.9m), 10s 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 Sunday (Aug 30) at 1AM. The primary swell is predicted to be 0.9m and 10s period with a secondary swell of 0.4m and 4s. 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 2.4m 7s and forecast to arrive on Wednesday (Sep 02) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 5s period and expected on Monday (Aug 31) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sun 30th Aug) | 3ft (0.9m) 10s |
| Best Surf | 10PM (Thu 3rd Sep) | 5.5ft (1.7m) 7s |
| Most Powerful | 10PM (Wed 2nd Sep) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright folks, let’s talk about the next couple of weeks. To be honest, it’s a pretty grim outlook for Porth Ceriad. The whole 16-day window is a tough one, with a real dry spell in the middle. We’ve got a few days of surfable – but not great – waves bookending a long stretch of nothing. Let’s get into it.
Things start off small and weak. Friday the 28th and Saturday the 29th of August deliver tiny, weak swell – think 1ft to 3ft from the SW at 6 seconds. The combined energy is low, in the single digits to 47 (weak energy). The wind is all over the place, offering a mix of cross-off, cross, and onshore, but the wave quality is just poor. Not worth paddling out for.
Sunday the 30th sees a bump in wind, with a strong onshore breeze. The swell tries to build to 4ft on the afternoon, but with a 5-second period, it’s just messy and blown out. Monday the 31st morning is flat, but the afternoon brings a bit of a pulse – 3ft from the WSW with an 8-second period. The combined energy hits 123 (moderate), and the wind is cross-shore. It’s not clean, but it’s the first bit of real energy. Tuesday the 1st of September is a step back, with onshore winds and weak swell in the 2ft to 3ft range.
Then we hit a major gap. From Wednesday the 2nd through to Friday the 11th of September, there’s a long stretch where the surf quality is consistently poor. The swell is there, but the wind is almost always a problem. On Wednesday the 2nd afternoon, the swell jumps to 7ft from the SW at 6 seconds, with a strong energy reading of 295 (moderate), but the wind is a fresh cross-onshore making it lumpy. Thursday the 3rd is a write-off – a near gale force wind and 6ft of messy swell. That kind of setup looks more interesting for kite surfing than paddle surfing. The combined energy for that Thursday morning is 292 (moderate). After a brief clean-ish window on Friday the 4th and Saturday the 5th, the swell drops right off. From the 6th to the 10th, it’s almost flat, with energy readings in the single digits and zeros. The wind is clean on some days, but there’s nothing to ride. It’s a long, blank run.
The forecast does perk up a bit for the very end. On Saturday the 12th of September, the swell is back with a vengeance. We’re looking at 7ft from the SW at 7 seconds in the morning, with a combined energy of 474 (strong). The wind is a near gale – terrible. But the afternoon is the standout of the whole forecast. The swell drops to 7ft from the SW, still at 7 seconds, with a strong energy of 407, and the wind switches to a cross-off from the NW at 18 mph. That’s clean. That’s the only window in the entire 16 days where the conditions align. For experienced surfers, the afternoon of Saturday the 12th looks like it could be the best on offer, but remember, a 7ft swell is expert territory. The water temperature is 66°F, which is described as much warmer than normal for this time of year, so you won’t need a thick wetsuit.
Hang in there, but don’t get your hopes up until that final Saturday.
Rusty.
Short Range ForecastHeavy rain (total 26mm), heaviest during Sat morning. Very mild (max 17°C on Fri afternoon, min 15°C on Sun night). Winds increasing (light winds from the N on Sat afternoon, fresh winds from the S by Sun afternoon). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Tue night. Very mild (max 18°C on Mon night, min 13°C on Tue night). Mainly strong winds. | ||||||||||||||||||||
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 6 | SW 10 | SW 8 | SSW 5 | SW 8 | W 5 | WSW 8 | WSW 5 | WSW 6 | SW 6 | SW 4 | SW 5 | SW 6 | SW 8 | WSW 8 | SW 6 | WSW 7 |
Wave Graph | |||||||||||||||||||||
6 | 10 | 51 | 46 | 18 | 154 | 57 | 67 | 186 | 0 | 123 | 44 | 48 | 16 | 23 | 83 | 295 | 503 | 292 | 209 | 237 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | cross | off | cross-off | on | on | cross-on | cross-off | cross | cross | cross-on | cross-on | off | on | cross-on | cross-on | cross-on | cross-on | 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 | ||||||||
6:20 | — | — | 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 | 2 | — | 1 | 8 | — | 1 | 4 | 6 | 4 | — | — | — | — | 1 | 3 | — | 4 | — | — | — | 3 |
Temp °C | 16 | 17 | 17 | 17 | 17 | 16 | 17 | 16 | 16 | 15 | 17 | 18 | 16 | 17 | 17 | 16 | 16 | 17 | 18 | 18 | 16 |
Feels °C | 15 | 16 | 14 | 15 | 17 | 14 | 13 | 11 | 12 | 10 | 14 | 14 | 14 | 12 | 13 | 13 | 10 | 13 | 11 | 11 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | — | SW 6 | SW 6 | SW 10 | SW 8 | SW 8 | SW 8 | — | WSW 8 | SW 8 | WSW 6 | NW 4 | W 16 | — | — | — | — | — | SW 14 |
6 | 10 | — | 46 | 18 | 154 | 57 | 18 | 186 | — | 123 | 17 | 7 | 6 | 5 | — | — | — | — | — | 8 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | NW 4 | — | WSW 8 | — | — | — | — | — | NW 4 | W 16 | — | — | — | — | — | — |
— | — | — | — | — | 5 | — | 14 | — | — | — | — | — | 4 | 5 | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | W 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SW 2 | SW 3 | SW 5 | SE 2 | — | — | SSW 4 | SSW 5 | — | W 5 | NW 5 | WSW 5 | WSW 6 | SW 6 | SW 4 | SW 5 | SW 6 | SW 8 | WSW 8 | SW 6 | WSW 7 |
1 | 1 | 51 | 1 | — | — | 11 | 67 | — | 160 | 41 | 44 | 48 | 16 | 23 | 83 | 295 | 503 | 292 | 209 | 237 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 307 | 314 | 307 | 47 | 125 | 0 | 201 | 312 | 3 | 638 | 3 | 126 | 141 | 494 | 200 | 298 | 324 | 404 | 298 | 502 | 3 |
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.











