Surf Forecasts:
Porth Ceriad surf forecast from 26 Aug 2026:
- Most powerful swell: Monday 31 Aug, 1AM (local time) - 6ft (1.8m), 8s period, WSW swell with 402 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 1.8m 8s and forecast to arrive on Monday (Aug 31) 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 1.3m 5s period and expected on Friday (Aug 28) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Mon 31st Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m looking at the next couple of weeks for Porth Ceriad. Honestly, it’s a pretty grim stretch for paddle surfers here. The data shows a long, frustrating run of poor conditions, but there is a tiny glimmer of hope right at the very end.
The first recommendation isn’t until the 10th of September, so we’re looking at a solid two-week gap of flat, blown-out, or just plain messy surf. From the 26th of August right through to the 9th of September, it’s one big write-off. The swell is tiny, the wind is ruining everything, and when we do get a bit of size, it’s accompanied by howling onshores. The combined energy stays low or moderate, barely ever getting interesting, and the forecast is all "poor surf conditions." It’s a frustrating desert for anyone who wants to paddle. There’s a brief moment of 5ft on the 31st, but it’s with a fresh cross-shore chop, so it’s not worth your time.
Now, the standout, and the only real option, is the morning of Thursday, the 10th of September. This is the one to get excited about. Porth Ceriad will finally see some solid, clean surf. The swell is up to 6ft from the SW with a combined energy of 453, which is a good, solid wall of water. The best part is the NNE wind, which is offshore and glassy – that’s the magic word. The forecast even says "expect good surf conditions." This is the one session in the whole outlook. It’s not massive, but it will be clean and have some push. Perfect for a beginner up to an intermediate who wants some fun, lined-up waves.
The afternoon of the 10th looks even bigger at 8ft from the SW, with a combined energy of 558 and a clean, cross-off breeze. That’s a step up in power, but it’s still manageable for a confident surfer. The wind is clean, so the waves will have shape. If you’re an experienced surfer, this is the time to be on it.
The water temperature is sitting at 66°F, which is much warmer than normal for this time of year. That’s a nice bonus for that Thursday session.
So, to put it bluntly: don’t even bother checking the forecast until the 10th of September. The two weeks before that are a total washout. But that Thursday morning? That’s the one. It’s not a world-class bomb, but it’s the best we’ve got, and it looks like a proper fun session with clean, offshore conditions. Mark it on your calendar.
Rusty
Short Range ForecastHeavy rain (total 51mm), heaviest during Thu afternoon. Warm (max 22°C on Wed afternoon, min 16°C on Thu afternoon). Winds increasing (light winds from the SE on Wed morning, fresh winds from the SW by Thu night). | Days 4-6 Weather SummaryHeavy rain (total 35mm), heaviest during Sat morning. Very mild (max 18°C on Sat afternoon, min 14°C on Sun night). Winds increasing (moderate winds from the SW on Sat night, strong winds from the SW by Mon night). | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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) | SSW 8 | SSW 8 | SW 7 | SW 12 | W 12 | SW 5 | SW 6 | SW 7 | SW 5 | SW 6 | SW 7 | SW 9 | SW 9 | SW 6 | WSW 8 | W 6 | WSW 9 | SW 6 | WSW 7 | SW 7 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 6 | 2 | 6 | 3 | 55 | 7 | 28 | 63 | 60 | 96 | 197 | 118 | 228 | 402 | 193 | 207 | 256 | 154 | 69 | 34 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross | cross-off | cross | cross-on | cross-off | cross-on | cross-on | on | cross-on | cross | on | on | cross | cross-off | cross-on | cross-on | cross | cross-on | cross-off |
High Tide | 8:20PM3.91m | 8:37AM3.75m | 8:52PM4.21m | 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 | ||||||||
Low Tide | 3:01PM0.77m | 3:27AM0.54m | 3:34PM0.55m | 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 | ||||||||
 | |  |  |  |  |  | |  |  | | |  |  |  | | |  | | |  | |
 | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — |
 | — | 8:21 | — | — | 8:19 | — | — | 8:16 | — | — | 8:14 | — | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — |
mm | — | — | — | 5 | 24 | 19 | — | — | 3 | 10 | 6 | — | 3 | 7 | 2 | — | — | 7 | — | — | — |
Temp °C | 20 | 22 | 21 | 18 | 16 | 16 | 17 | 18 | 17 | 17 | 18 | 17 | 18 | 17 | 16 | 14 | 16 | 16 | 15 | 17 | 16 |
Feels °C | 20 | 21 | 18 | 18 | 15 | 15 | 16 | 16 | 14 | 11 | 14 | 13 | 12 | 12 | 11 | 8 | 10 | 9 | 9 | 11 | 11 |
Swell 1 Height (m) Direction Period (s) | SSW 8 | SSW 8 | SW 7 | SW 7 | SW 6 | NNW 5 | SW 6 | NW 5 | — | SW 6 | SW 7 | SW 9 | SW 9 | — | — | — | NW 5 | — | WSW 7 | SW 7 | SW 6 |
| kJ | 6 | 6 | 2 | 2 | 1 | 2 | 7 | 18 | — | 60 | 96 | 197 | 118 | — | — | — | 20 | — | 154 | 69 | 34 |
Swell 2 Height (m) Direction Period (s) | W 13 | — | SW 4 | SW 12 | — | W 12 | — | SW 7 | — | — | — | — | NNW 4 | — | — | — | — | — | — | NW 4 | W 16 |
| kJ | 3 | — | 1 | 6 | — | 3 | — | 28 | — | — | — | — | 1 | — | — | — | — | — | — | 12 | 5 |
Swell 3 Height (m) Direction Period (s) | — | W 12 | — | W 12 | W 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 3 | — | 3 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SE 3 | — | E 2 | ESE 3 | — | SW 5 | WNW 5 | WNW 4 | SW 5 | SSE 3 | — | NW 3 | SSW 4 | SW 6 | WSW 8 | W 6 | WSW 9 | SW 6 | NW 5 | W 7 | NW 4 |
| kJ | 2 | — | 1 | 1 | — | 55 | 77 | 14 | 63 | 7 | — | 6 | 9 | 228 | 402 | 193 | 207 | 256 | 17 | 63 | 15 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 255 | 350 | 312 | 271 | 200 | 200 | 191 | 3 | 236 | 337 | 103 | 103 | 319 | 46 | 3 | 120 | 272 | 252 | 630 | 460 | 318 |
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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