Surf Forecasts:
Porth Ceriad surf forecast from 29 Jul 2026:
- Most powerful swell: Wednesday 29 Jul, 10PM (local time) - 3.5ft (1.1m), 5s period, SW swell with 60 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 1.1m 5s and forecast to arrive on Wednesday (Jul 29) 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 0.8m 4s period and expected on Sunday (Aug 02) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Wed 29th Jul) | 3.5ft (1.1m) 5s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, Rusty here. Let's break down what's ahead.
Right off the bat, it’s a tough look. From Wednesday the 29th of July all the way through to Thursday the 6th of August, there’s basically nothing worth paddling out for. The swell is flat-out weak, with tiny heights (0.3 to 2 feet), short periods (4 to 9 seconds), and combined energy that’s barely a blip (5 to 18). A few mornings look clean with a cross-off or offshore breeze, but with waves that small, you're just wasting wax. The water temp is sitting at 64°, about 3° warmer than average – feels like a bath for late July.
Now, here's the one to wait for: Friday the 7th of August. That morning, a solid 8 foot SW groundswell rolls in with an 8-second period and the combined energy jumps to 600 (moderate wave energy). The wind is a gentle cross-off from the WNW, keeping things clean. This is the standout of the entire 16-day window. But listen – 8 feet is a serious wave, so this is experts only. Beginners, stay on the beach. That's Porth Ceriad at its best, with the swell coming right out of the SW, its optimum direction. Crowds are likely, so be ready for company.
Over the weekend of the 8th and 9th of August, the swell backs way down. Saturday morning is messy with an onshore wind and 4 feet of WSW swell. The afternoon improves a bit – 4 feet SW swell (133 combined energy) and a light cross-off breeze. Surfable, but just average. Sunday is similar: 3 to 4 feet SW swell with light cross-off winds, but energy drops to 58-81. Just small, ordinary waves.
Moving into the second week, from the 10th to the 13th of August, we get a stretch of clean offshore NW and N winds. Swell sits between 2 and 4 feet with 7-8 second periods. The best of this run is Tuesday the 11th of August in the morning: a moderate offshore at 12 mph, 4 foot SW swell, and combined energy of 131. Clean and fun on a fish or a longboard. The wind gets stronger that afternoon (18 mph offshore), which might make things too blown out.
Bottom line: if you only surf one session in the next two weeks, make it the morning of Friday the 7th of August at Porth Ceriad. That's the real deal. The rest is either flat or just okay.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Fri night. Very mild (max 18°C on Wed morning, min 14°C on Thu morning). Winds decreasing (fresh winds from the SSW on Wed afternoon, calm by Thu night). | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Mon night. Very mild (max 18°C on Sun afternoon, min 13°C on Mon night). Winds increasing (calm on Sat night, fresh winds from the ESE by Sun night). | ||||||||||||||||||||
Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 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 4 | SW 4 | SW 5 | WSW 5 | SW 5 | WSW 4 | SW 5 | SW 5 | WSW 4 | WSW 5 | NW 4 | SW 9 | WSW 4 | SW 8 | WSW 8 | WSW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 18 | 17 | 36 | 11 | 6 | 7 | 5 | 5 | 18 | 10 | 2 | 3 | 3 | 3 | 7 | 7 | 11 | 18 | 10 | 9 | 8 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | off | cross-off | cross-off | glassy | cross | cross-on | cross-off | cross-off | cross-on | glassy | glassy | off | cross-off | cross | cross-off | cross-off | cross | cross | cross-off |
High Tide | 9:16PM4.07m | 9:32AM3.82m | 9:49PM4.25m | 10:06AM3.92m | 10:23PM4.38m | 10:40AM3.99m | 10:57PM4.42m | 11:15AM4.00m | 11:32PM4.39m | 11:53AM3.96m | 00:11AM4.27m | 12:34PM3.84m | 00:54AM4.07m | ||||||||
Low Tide | 4:02PM0.66m | 4:30AM0.51m | 4:35PM0.55m | 5:04AM0.42m | 5:09PM0.50m | 5:38AM0.39m | 5:41PM0.53m | 6:12AM0.44m | 6:13PM0.62m | 6:46AM0.54m | 6:45PM0.75m | 7:20AM0.69m | 7:17PM0.91m | ||||||||
 |  |  |  | |  | | |  | | |  | | | | | |  |  | | | |
 | 5:30 | — | — | 5:31 | — | — | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — |
 | — | — | 9:16 | — | — | 9:15 | — | — | 9:13 | — | — | 9:12 | — | — | 9:09 | — | — | 9:07 | — | — | 9:06 |
mm | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | 7 | 5 | 2 | 6 |
Temp °C | 18 | 18 | 17 | 15 | 16 | 15 | 14 | 16 | 17 | 14 | 15 | 15 | 16 | 18 | 16 | 14 | 15 | 16 | 14 | 14 | 14 |
Feels °C | 16 | 15 | 15 | 12 | 14 | 15 | 11 | 12 | 13 | 11 | 14 | 13 | 14 | 14 | 13 | 9 | 13 | 13 | 9 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 5 | WSW 5 | SW 5 | WSW 4 | SW 5 | NW 4 | WSW 4 | WSW 5 | NW 4 | WSW 4 | WSW 4 | SW 8 | WSW 8 | NNW 4 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 |
| kJ | — | — | 36 | 11 | 6 | 7 | 5 | 2 | 18 | 10 | 2 | 2 | 2 | 3 | 7 | 2 | 11 | 18 | 10 | 9 | 8 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | NW 4 | — | — | — | W 12 | W 10 | WSW 5 | SW 9 | SW 8 | SW 4 | SW 8 | WSW 9 | NNW 4 | — | — | — | — |
| kJ | — | — | — | — | 2 | — | — | — | 3 | 2 | 2 | 3 | 3 | 1 | 3 | 7 | 2 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | W 9 | — | — | — | W 10 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | 2 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 4 | — | NW 3 | — | — | NW 4 | SW 5 | — | NW 4 | — | — | — | NNW 4 | NNE 4 | ESE 3 | ENE 2 | — | — | — | — |
| kJ | 18 | 17 | — | 4 | — | — | 5 | 5 | — | 6 | — | — | — | 16 | 7 | 1 | 1 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 296 | 298 | 298 | 494 | 532 | 298 | 305 | 532 | 306 | 296 | 317 | 254 | 306 | 306 | 308 | 133 | 254 | 133 | 308 | 271 | 314 |
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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