Surf Forecasts:
Porth Ceriad surf forecast from 29 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: Friday 4 Sep, 10AM (local time) - 8ft (2.4m), 7s period, WSW swell with 540 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 with a secondary swell of 0.1m and 10s. 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 Friday (Sep 04) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Saturday (Sep 05) at 4AM.
| 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 | 10AM (Fri 4th Sep) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the cards for Porth Ceriad.
Right off the bat, I gotta be straight with you – the next week and a half is a real struggle. The forecast is a long, drawn-out run of poor surf, with a lot of wind and messy conditions. The first real glimmer of anything surfable doesn't show up until Sunday, the 6th of September, and even then it's a shaky call. We’re looking at a solid 8-day gap of nothing worthwhile before that.
Starting with that Sunday the 6th, the afternoon session offers the first real chance. We’ve got a clean 8ft swell from the SW, with a combined energy of (522) – that’s some proper power in the water. The wind is WNW and cross-offshore, which is a solid look for Porth Ceriad. It’s a clean wave, but with that size, it’s pushing into meaty territory. This is one for the experienced crew.
The standout, and I mean the *real* standout, is Thursday the 10th of September. The morning session is looking absolutely massive. The models are calling for a 10ft swell from the SW, with a period of 9 seconds, and the combined energy is a whopping (1475). That’s a lot of ocean moving. However, the forecast also says the swell is predicted to be too big for this break. That’s a serious caveat. Wind is light and cross-onshore, but the sheer size will make it a beast. This is strictly for the experts only, and even then, proceed with extreme caution. Beginners, don’t even think about it.
After that, things start to fade again. The morning of Monday the 7th of September offers a tiny 2ft clean wave with light NNW winds, but it’s very ordinary. The rest of the second week is a mix of tiny, weak, and onshore conditions. The afternoon of Tuesday the 8th is dead flat and glassy, with a 1.0ft swell – barely a ripple.
Overall, if you’re a seasoned surfer and you’re looking for a serious challenge, pencil in the morning of Thursday the 10th of September, but know it’s a gamble. For a more manageable, clean wave, the afternoon of Sunday the 6th of September is your best bet. Otherwise, this stretch is a write-off.
Rusty.
Short Range ForecastHeavy rain (total 23mm), heaviest during Sat morning. Very mild (max 17°C on Mon night, min 14°C on Mon morning). Mainly strong winds. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Tue night. Very mild (max 18°C on Wed morning, min 14°C on Thu night). Mainly strong winds. | ||||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | |||||||||||||||
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 9 | SW 8 | SW 5 | SW 8 | WSW 9 | SW 9 | SW 8 | SW 4 | SW 5 | SW 5 | SW 6 | SW 7 | SW 7 | WSW 7 | WSW 7 | WSW 5 | WSW 7 | WSW 7 | W 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 30 | 18 | 166 | 72 | 60 | 161 | 165 | 107 | 31 | 40 | 71 | 55 | 240 | 410 | 466 | 222 | 164 | 84 | 540 | 289 | 214 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | off | cross-on | on | on | cross | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross-on |
High Tide | 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 | 1:48PM3.50m | 2:24AM3.37m | ||||||||
Low Tide | 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 | 8:15AM1.21m | 8:50PM1.27m | ||||||||
 |  |  |  | |  |  |  | | | |  |  | | |  | | | | | | |
 | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — |
 | — | 8:14 | — | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:05 | — | — | 8:02 | — | — | 8:00 | — |
mm | 9 | 4 | — | 5 | 3 | 2 | — | — | — | — | — | 4 | 2 | — | — | — | — | — | — | — | 2 |
Temp °C | 16 | 16 | 16 | 16 | 16 | 16 | 14 | 16 | 17 | 16 | 16 | 17 | 18 | 17 | 17 | 16 | 17 | 15 | 15 | 17 | 18 |
Feels °C | 13 | 14 | 15 | 12 | 10 | 14 | 6 | 12 | 13 | 12 | 12 | 11 | 12 | 11 | 11 | 10 | 11 | 7 | 8 | 14 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | SW 9 | SW 8 | SW 8 | SW 8 | WSW 9 | SW 9 | SW 8 | — | — | W 16 | — | — | — | — | — | — | — | — | — |
| kJ | 30 | 18 | 166 | 72 | 18 | 135 | 165 | 107 | 31 | — | — | 5 | — | — | — | — | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | SE 3 | — | — | — | — | — | — | NW 5 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 2 | — | — | — | — | — | — | 5 | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SE 3 | — | — | SSW 3 | SW 5 | WSW 8 | NW 6 | NW 5 | SW 4 | SW 4 | SW 5 | SW 5 | SW 6 | SW 7 | SW 7 | WSW 7 | WSW 7 | WSW 5 | WSW 7 | WSW 7 | W 6 |
| kJ | 2 | — | — | 7 | 60 | 161 | 149 | 38 | 9 | 40 | 71 | 55 | 240 | 410 | 466 | 222 | 164 | 84 | 540 | 289 | 214 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 189 | 138 | 3 | 201 | 170 | 3 | 253 | 3 | 126 | 252 | 252 | 296 | 298 | 448 | 319 | 301 | 494 | 494 | 502 | 3 | 272 |
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.
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