Surf Forecasts:
Porth Ceriad surf forecast from 12 Aug 2026:
- Most powerful swell: Tuesday 18 Aug, 10PM (local time) - 4ft (1.2m), 6s period, SW swell with 95 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 1.2m 6s and forecast to arrive on Tuesday (Aug 18) 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 1.5m 5s period and expected on Wednesday (Aug 19) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Tue 18th Aug) | 4ft (1.2m) 6s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
G'day, I'm Rusty, and I’ve gotta be straight with you – the next couple of weeks at Porth Ceriad are looking pretty grim. We’ve got a long stretch of tiny, weak swell and mostly onshore or messy winds, so don’t get your hopes up for any kind of quality session. The water temperature is sitting at 66°F right now, which is a whopping 5°F warmer than usual for this time of year – that’s very unusual, and it’ll feel like a warm bath out there. But the waves? They’re just not happening.
From Wednesday the 12th of August all the way through to Sunday the 23rd of August, it’s a total write-off. Swell heights are mostly below 2 ft, with periods as short as 3 seconds, and the combined energy of all swells directed here is barely a whisper – often single digits or low teens, like 13 (13) or 7 (7). Winds are all over the place, but even when it’s clean, the swell is too small to do anything with. We’ve got a few days of offshore winds, like Friday the 14th morning with a NNW breeze at 6 mph, but the swell is only 2 ft and the period is a pathetic 5 seconds – just not enough push.
There’s a bit of a tease on Monday the 24th of August. The morning shows a 4 ft SSW swell with a 7-second period, and the combined energy jumps to 154 (154) – that’s moderate energy, finally. Winds are light offshore from the NNW at 6 mph, so it’ll be clean. The guidance says Porth Ceriad is a beginner-friendly spot, exposed to swells from the SW, and this SSW direction is close enough. But the period is short, so it’ll be a bit lumpy and weak. It’s the only real standout in the whole 16-day window, but it’s not exactly firing – just surfable waves with very ordinary conditions. Still, if you’re desperate, that’s your window. Crowds are often here, so you might have company.
After that, it’s back to tiny surf for the rest of the week, with a few more clean spells but nothing with any size. The 27th of August afternoon shows a 3 ft WSW swell with a 6-second period and 66 (66) combined energy – still weak, and the wind is light cross-off from the WNW. It’s surfable but very ordinary.
Bottom line: you’ve got a long gap of nothing until the 24th of August morning, and even that’s a marginal call. For a place that’s fairly consistent, this is a rough run, but forecasts can change. For now, leave the board in the car.
Rusty
Short Range ForecastSome drizzle, heaviest during Fri morning. Warm (max 27°C on Wed afternoon, min 14°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 17mm), heaviest on Mon morning. Very mild (max 18°C on Mon afternoon, min 13°C on Sat night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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) | WSW 10 | WSW 10 | SW 9 | SW 8 | SW 8 | SW 5 | SW 5 | SW 5 | SW 6 | WSW 7 | WSW 7 | SW 7 | SW 7 | SW 7 | W 7 | W 7 | SSE 3 | SW 6 | SW 7 | SW 6 | WSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 9 | 21 | 17 | 14 | 23 | 10 | 6 | 6 | 5 | 5 | 2 | 2 | 2 | 1 | 1 | 7 | 34 | 22 | 41 | 90 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | on | on | cross-on | on | off | off | off | off | cross-off | off | off | cross-off | glassy | on | cross | cross-off | cross | cross-on | cross-on |
High Tide | 8:47PM4.64m | 9:12AM4.31m | 9:31PM4.85m | 9:55AM4.39m | 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 | ||||||||
Low Tide | 3:43PM0.31m | 4:13AM-0.07m | 4:24PM0.16m | 4:55AM-0.16m | 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 | ||||||||
 | |  | |  |  |  |  | | | | | | | |  | |  | | |  | |
 | 5:52 | — | — | 5:54 | — | — | 5:56 | — | — | 5:58 | — | — | 6:00 | — | — | 6:01 | — | — | 6:03 | — | — |
 | — | 8:51 | — | — | 8:49 | — | — | 8:46 | — | — | 8:45 | — | — | 8:43 | — | — | 8:40 | — | — | 8:38 | — |
mm | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | 13 | 3 | 1 | — | — | 24 |
Temp °C | 24 | 27 | 26 | 21 | 21 | 18 | 18 | 19 | 17 | 14 | 16 | 15 | 14 | 15 | 15 | 16 | 18 | 18 | 16 | 17 | 18 |
Feels °C | 22 | 25 | 26 | 21 | 22 | 18 | 19 | 16 | 14 | 8 | 11 | 11 | 9 | 11 | 12 | 11 | 17 | 14 | 11 | 13 | 16 |
Swell 1 Height (m) Direction Period (s) | WSW 10 | WSW 10 | SW 9 | SW 8 | SW 8 | SW 8 | SW 5 | SW 5 | SW 6 | WSW 7 | WSW 7 | SW 7 | SW 7 | SW 7 | N 4 | — | SW 4 | SW 6 | SW 7 | W 17 | W 17 |
| kJ | 10 | 9 | 21 | 17 | 14 | 2 | 10 | 6 | 6 | 5 | 5 | 2 | 2 | 2 | 2 | — | 4 | 34 | 22 | 5 | 6 |
Swell 2 Height (m) Direction Period (s) | SW 6 | SW 6 | — | — | SW 10 | SW 9 | SW 8 | SW 8 | — | W 10 | — | — | — | — | W 7 | — | — | — | — | — | — |
| kJ | 1 | 1 | — | — | 4 | 3 | 2 | 2 | — | 2 | — | — | — | — | 1 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | W 6 | — | — | — | — | SW 6 | — | — | — | — | — | — | — | — | — | W 7 | W 7 | — | W 16 | — | — |
| kJ | 1 | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | 1 | 1 | — | 5 | — | — |
Wind waves Height (m) Direction Period (s) | SSE 2 | — | — | — | — | SW 5 | NW 4 | NW 4 | N 3 | NNW 4 | NNW 4 | N 3 | NNW 4 | NNW 4 | NNW 3 | — | SSE 3 | — | — | SW 6 | WSW 6 |
| kJ | 1 | — | — | — | — | 23 | 2 | 7 | 3 | 7 | 22 | 5 | 13 | 9 | 1 | — | 7 | — | — | 41 | 90 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 180 | 113 | 113 | 126 | 303 | 138 | 141 | 511 | 305 | 566 | 549 | 306 | 327 | 317 | 314 | 341 | 320 | 126 | 316 | 324 | 60 |
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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