Surf Forecasts:
Porth Ceriad surf forecast from 7 Aug 2026:
- Most powerful swell: Thursday 13 Aug, 1AM (local time) - 1.5ft (0.4m), 9s period, SW swell with 21 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 0.4m 9s and forecast to arrive on Thursday (Aug 13) at 1AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Friday (Aug 14) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Thu 13th Aug) | 1.5ft (0.4m) 9s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be straight with you – I’ve been staring at the charts for Porth Ceriad and, honestly, it’s been a tough watch. The next 16 days are looking pretty grim for anyone wanting to get a proper wave. The whole forecast is a long, drawn-out stretch of tiny, weak surf with hardly any energy behind it.
The water is sitting at 64°F which is a solid 4°F warmer than usual for this time of year, so it’s not a wetsuit battle, but you’ll be doing more floating than surfing.
We’ve got a big gap right at the start. From now until the morning of the 19th of August, there’s basically nothing worth paddling out for. The swell is a joke – mostly 0.3ft to 1.0ft, and the combined energy is pathetic, barely tickling double digits (like 9 or 6). The wind is all over the place, mostly cross-on or onshore, keeping the surface messy. You’ll be chasing whitewash.
Finally, on the morning of Wednesday the 19th of August, there’s a tiny glimmer. The swell bumps up to a meagre 4ft from the WSW, with a short 6-second period. The combined energy reads 115, which is still weak, but at least it’s a number. The wind is a moderate offshore from the N, which will keep it clean. The guidance says it’s surfable, but it’s rated as very ordinary. This is for confident beginners who don’t mind working for scraps.
The afternoon of the 19th sees the wind freshen to 19 mph from the NNW, which is still offshore but will be strong and make the surface bumpy. The energy drops back to 86. It’s not great.
Then the 20th of August (Thursday morning) offers a little cleanup with a light offshore NNE wind and a 2ft WSW swell, energy at 51. It’s clean, but tiny.
After that, it’s back to the doldrums for the rest of the window. The 21st and 22nd of August are back to 0.3ft and 1ft with a mix of cross-on breezes. The swell on the 22nd has a long period of 13-14 seconds, but with zero height, it’s just a ripple on the water.
The best on offer? There isn’t a standout. If you are absolutely desperate, the morning of the 19th of August is the only window where you might get a knee-high wave that’s clean. The 4ft swell is still tiny, but the offshore wind will make it look better than it is. Just don’t expect much.
This is a classic blank run for an exposed spot like Porth Ceriad when the swell windows aren’t lining up. Forecasts can change, but for now, don’t bother waxing up.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Sun afternoon, min 14°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Wed afternoon, min 16°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||
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 | WSW 4 | SW 11 | SW 8 | WSW 7 | SW 7 | SW 12 | WSW 3 | WSW 4 | WSW 6 | WSW 6 | SW 6 | SW 6 | W 12 | WSW 10 | WSW 10 | SW 9 | SW 8 | SW 8 | SW 4 |
Wave Graph  | ||||||||||||||||||||
 kJ | 3 | 7 | 5 | 3 | 5 | 7 | 6 | 1 | 2 | 3 | 4 | 2 | 2 | 3 | 10 | 10 | 21 | 18 | 17 | 9 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | cross-on | on | cross-on | cross-on | off | cross-off | cross-off | cross-off | cross-on | glassy | cross-on | cross-on | cross-on | on | on | glassy | off |
High Tide | 4:04AM3.34m | 4:47PM3.30m | 5:27AM3.38m | 6:03PM3.53m | 6:38AM3.60m | 7:06PM3.90m | 7:36AM3.87m | 7:59PM4.30m | 8:26AM4.13m | 8:47PM4.64m | 9:12AM4.31m | 9:31PM4.85m | ||||||||
Low Tide | 10:25PM1.35m | 11:26AM1.31m | 00:15AM1.24m | 12:58PM1.15m | 1:37AM0.91m | 2:04PM0.85m | 2:37AM0.52m | 2:57PM0.55m | 3:28AM0.17m | 3:43PM0.31m | 4:13AM-0.07m | 4:24PM0.16m | ||||||||
 |  |  |  |  | | | | | | | | | | | | | | | | |
 | — | — | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — |
 | — | 9:00 | — | 8:59 | — | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — | — | 8:51 | — | — | 8:49 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 15 | 15 | 17 | 17 | 16 | 18 | 18 | 16 | 17 | 18 | 22 | 24 | 24 | 22 | 27 | 20 | 17 | 20 | 20 |
Feels °C | 12 | 13 | 13 | 16 | 15 | 15 | 17 | 18 | 13 | 13 | 15 | 20 | 23 | 22 | 17 | 24 | 19 | 18 | 21 | 22 |
Swell 1 Height (m) Direction Period (s) | — | WSW 4 | WSW 3 | WSW 3 | WSW 7 | SW 7 | SW 6 | WSW 3 | WSW 4 | WSW 6 | WSW 6 | SW 6 | SW 6 | SW 6 | WSW 10 | WSW 10 | SW 9 | SW 8 | SW 8 | SW 4 |
| kJ | — | 7 | 1 | 1 | 5 | 7 | 2 | 1 | 2 | 3 | 4 | 2 | 2 | 1 | 10 | 10 | 21 | 18 | 17 | 9 |
Swell 2 Height (m) Direction Period (s) | W 12 | SW 12 | SW 11 | SW 8 | — | W 12 | — | SW 6 | SW 6 | WSW 5 | — | — | — | W 12 | — | SW 6 | — | SW 4 | — | WSW 8 |
| kJ | 3 | 5 | 5 | 3 | — | 3 | — | 1 | 1 | 2 | — | — | — | 3 | — | 1 | — | 3 | — | 6 |
Swell 3 Height (m) Direction Period (s) | W 12 | — | — | — | — | — | SW 12 | — | — | — | — | — | — | — | SW 6 | — | — | — | — | WSW 6 |
| kJ | 3 | — | — | — | — | — | 6 | — | — | — | — | — | — | — | 1 | — | — | — | — | 4 |
Wind waves Height (m) Direction Period (s) | SW 5 | — | — | — | WSW 3 | WSW 3 | — | — | NNW 3 | — | — | ESE 3 | — | — | SE 3 | — | SW 3 | — | SW 4 | — |
| kJ | 3 | — | — | — | 1 | 1 | — | — | 1 | — | — | 1 | — | — | 1 | — | 2 | — | 2 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 314 | 298 | 298 | 298 | 303 | 385 | 385 | 306 | 303 | 305 | 298 | 307 | 329 | 186 | 321 | 132 | 125 | 138 | 404 | 138 |
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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