Surf Forecasts:
Porth Ceriad surf forecast from 14 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 4AM (local time) - 4ft (1.2m), 6s period, WSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 19 Aug, 10AM (local time) - 5ft (1.6m), 6s period, WSW swell with 192 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 4AM (local time) - 4ft (1.2m), 6s period with WSW 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 Tuesday (Aug 18) at 4AM. The primary swell is predicted to be 1.2m and 6s 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 1.6m 6s and forecast to arrive on Wednesday (Aug 19) 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 1.6m 6s period and expected on Wednesday (Aug 19) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Tue 18th Aug) | 4ft (1.2m) 6s |
| Best Surf | 4AM (Tue 18th Aug) | 4ft (1.2m) 6s |
| Most Powerful | 10AM (Wed 19th Aug) | 5ft (1.6m) 6s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Right now, it’s looking pretty flat and sad out here at Porth Ceriad. The water’s come up to 66°F which is a solid 6°F warmer than usual for this time of year, so if you’re just keen for a paddle and a float, you’ll be stoked. But for actual waves? There’s basically nothing on offer for the next couple of weeks.
The first real glimmer of interest doesn’t show up until Thursday the 27th. The morning brings some light rain and a weak, onshore bump of 4ft at 4 seconds, with only moderate energy (47). Not worth getting wet for. The afternoon is where it gets a touch more interesting – the swell bumps up to 5ft from the SSW at 6 seconds, and the energy jumps to a moderate 188. It’s glassy, which is a massive plus, and while it’s still pretty ordinary, it’s the first thing that’s even surfable. For a beginner-friendly break, 5ft is right at the limit of comfortable, so you’ll want to pick your moments.
But honestly, the real story here is what’s brewing for Friday the 28th. The forecast is showing a big pulse of groundswell rolling in. It’s still a week and a half out, so treat it as promising rather than a sure thing, but if it lines up, we’re looking at a solid 12ft of WSW groundswell with a 10-second period. The energy is through the roof – 2371 in the morning and building to 2697 by the afternoon. That’s strong to very strong, no doubt. The wind’s offshore and fresh, which will keep things clean. But here’s the catch: this break is a beach setup, and a long-period swell like this can make it break a bit too straight and shut down. More importantly, at 12ft, this is way over the 8ft mark. This is strictly for experts only – if you’re not confident in serious, heavy surf, give this one a wide berth. Beginners should not even think about it.
Saturday the 29th sees it dropping, but it’s still big. You’ve got 10ft of WSW swell in the morning, still pushing strong energy (1085), with clean offshore winds. Again, this is an expert-only situation. By the afternoon, it drops to 8ft with the period shortening to 8 seconds, and the energy backs off to a moderate 707. The wind goes a little cross-off, so it’s still clean, but the conditions are flagged as marginal with questionable tide. Just be careful out there.
So, to sum it up: we’ve got a long, flat run until that Thursday bump, which is your only window for anyone who isn’t a pro. Then Friday is the true standout if you’ve got the skills and the nerve – it’ll be huge, powerful, and clean, but it’s no place for the faint-hearted.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Fri morning, min 14°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Mon night. Very mild (max 18°C on Mon night, min 14°C on Wed night). Winds increasing (light winds from the NNW on Mon morning, strong winds from the W by Tue night). | ||||||||||||||||||||
Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | |||||||||||||||
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 5 | SW 5 | WSW 7 | WSW 7 | WSW 7 | SW 7 | SW 7 | W 7 | SW 3 | WSW 5 | SW 5 | SW 6 | W 6 | SW 6 | W 4 | WSW 6 | W 6 | WSW 7 | SW 6 | SW 14 | SW 14 |
Wave Graph | |||||||||||||||||||||
10 | 5 | 5 | 5 | 5 | 2 | 2 | 1 | 3 | 10 | 9 | 95 | 73 | 35 | 47 | 192 | 119 | 31 | 9 | 8 | 8 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | off | off | off | cross-off | off | glassy | cross-on | cross-on | cross-off | cross-on | cross | cross-off | cross-on | cross | cross | cross | cross-off | off | cross-off | cross-off |
High Tide | 10:13PM4.92m | 10:36AM4.37m | 10:55PM4.81m | 11:16AM4.24m | 11:35PM4.56m | 11:55AM4.03m | 00:15AM4.20m | 12:35PM3.75m | 00:56AM3.78m | 1:17PM3.43m | 1:41AM3.34m | 2:05PM3.11m | 2:38AM2.96m | ||||||||
Low Tide | 5:03PM0.12m | 5:34AM-0.10m | 5:40PM0.20m | 6:11AM0.09m | 6:16PM0.37m | 6:46AM0.37m | 6:49PM0.61m | 7:18AM0.70m | 7:22PM0.88m | 7:50AM1.04m | 7:58PM1.17m | 8:25AM1.34m | 8:46PM1.43m | ||||||||
5:56 | — | — | 5:58 | — | — | 6:00 | — | — | 6:01 | — | — | 6:03 | — | — | 6:05 | — | — | 6:07 | — | — | |
— | 8:46 | — | — | 8:45 | — | — | 8:43 | — | — | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:34 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 18 | 17 | 15 | 16 | 16 | 15 | 16 | 17 | 15 | 16 | 18 | 16 | 18 | 17 | 16 | 18 | 18 | 15 | 15 | 15 |
Feels °C | 20 | 15 | 14 | 11 | 12 | 14 | 14 | 14 | 18 | 15 | 13 | 16 | 12 | 14 | 14 | 10 | 14 | 16 | 11 | 10 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 5 | SW 5 | WSW 7 | WSW 7 | WSW 7 | NNW 3 | SW 7 | SW 4 | W 7 | WSW 5 | — | — | W 16 | NW 4 | W 17 | — | W 16 | WSW 7 | SW 6 | WSW 6 | SW 5 |
10 | 5 | 5 | 5 | 5 | 1 | 2 | 1 | 1 | 10 | — | — | 5 | 7 | 6 | — | 5 | 31 | 9 | 3 | 1 | |
Swell 2 Height (m) Direction Period (s) | SW 8 | SW 8 | — | W 10 | — | SW 7 | — | W 7 | W 7 | — | — | — | — | W 17 | — | — | — | SW 16 | W 15 | SW 14 | SW 14 |
2 | 2 | — | 2 | — | 2 | — | 1 | 1 | — | — | — | — | 5 | — | — | — | 10 | 4 | 8 | 8 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | W 7 | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | NW 2 | N 3 | NNW 4 | NNW 4 | NNW 4 | — | — | SW 3 | WSW 5 | SW 5 | SW 6 | W 6 | SW 6 | W 4 | WSW 6 | W 6 | NNW 6 | NW 5 | NW 5 | NNW 6 |
— | 1 | 2 | 7 | 21 | 5 | — | — | 3 | 8 | 9 | 95 | 73 | 35 | 47 | 192 | 119 | 164 | 82 | 38 | 18 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 138 | 252 | 317 | 354 | 511 | 298 | 298 | 317 | 191 | 312 | 336 | 638 | 308 | 460 | 494 | 918 | 126 | 63 | 113 | 113 | 133 |
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.











