Surf Forecasts:
Porth Ceriad surf forecast from 10 Aug 2026:
- Most powerful swell: Friday 14 Aug, 1AM (local time) - 2.5ft (0.8m), 5s period, WSW swell with 34 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 0.8m 5s and forecast to arrive on Friday (Aug 14) 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 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Fri 14th Aug) | 2.5ft (0.8m) 5s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, let’s get this straight. I’ve had a proper look at the charts for Porth Ceriad, and to be honest, it’s a tough one. The whole 16-day window is a bit of a write-off for any decent paddle surfing. We’ve got a lot of days with hardly any swell, and when there is a little bump, the conditions just aren’t playing ball.
Now, the water is sitting at about 65°, which is much warmer than normal for this time of year. That’s a real treat if you do get in, but you’ll be doing more floating than surfing.
The first real hint of anything that might get a surfer’s heart beating doesn’t come until the afternoon of Saturday, the 22nd of August. The swell climbs to a tiny 4ft from the south, with a short period of 5 seconds, and the combined energy is a weak 64. It’s described as “surfable waves but very ordinary conditions.” The wind goes glassy, so it’ll be clean, but it’s just not got any power. For a beginner, this is a flat, gentle push, but for anyone else, it’s a real struggle.
Then, Sunday, the 23rd of August morning looks a bit more promising on paper, with a 5ft swell from the west and a combined energy of 151 (moderate). The wind is offshore, so it’ll be clean. But the period is a short 5 seconds, so it’s all wind-swell bump. It’s going to be a bit of a messy, close-out wave. That afternoon, the swell jumps to 6ft from the northwest, with a strong energy of 298, but a strong cross-onshore wind kills it completely. It’ll be choppy and hard work.
Honestly, that’s it. The rest of the period is a total flat spell. There’s a big gap after the 23rd with nothing at all. Porth Ceriad is an exposed, easy spot, so it’s a bit of a surprise to see it so quiet, but sometimes the ocean just takes a holiday. The setup is so weak for so long that it looks more interesting for a kite surfer than someone on a shortboard, especially on the 23rd when there’s a bit of wind.
So, keep your wax in the cupboard, lads. The only real window is that glassy Saturday afternoon, but it’s a real small-wave, log session or a beginner’s day, and that’s being generous.
- Rusty
Short Range ForecastMostly dry. Warm (max 25°C on Wed afternoon, min 14°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Thu morning, min 15°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | |||||||||||||||
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 6 | SW 6 | SW 6 | SW 6 | SW 6 | W 11 | WSW 10 | WSW 10 | WSW 9 | SW 8 | SW 8 | WSW 5 | SW 5 | SW 5 | WSW 4 | SW 5 | SW 6 | WSW 7 | SW 7 | SW 7 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 11 | 5 | 6 | 2 | 2 | 3 | 10 | 9 | 16 | 18 | 14 | 34 | 12 | 6 | 6 | 7 | 8 | 5 | 2 | 2 | 2 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | cross-on | cross | cross-on | glassy | cross-off | glassy | on | on | on | cross-off | cross-off | off | cross-off | cross-off | off | glassy | cross-off | cross-off |
High Tide | 7:06PM3.90m | 7:36AM3.87m | 7:59PM4.30m | 8:26AM4.13m | 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 | ||||||||
Low Tide | 2:04PM0.85m | 2:37AM0.52m | 2:57PM0.55m | 3:28AM0.17m | 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 | ||||||||
 | |  |  | |  | | | | | | | | | | | | |  | | | |
 | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:56 | — | — | 5:58 | — | — | 6:00 | — | — |
 | — | 8:54 | — | — | 8:52 | — | — | 8:51 | — | — | 8:49 | — | — | 8:46 | — | — | 8:45 | — | — | 8:43 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 17 | 16 | 21 | 21 | 21 | 23 | 25 | 25 | 21 | 21 | 18 | 16 | 17 | 17 | 17 | 18 | 16 | 16 | 17 | 16 |
Feels °C | 12 | 13 | 12 | 20 | 19 | 21 | 21 | 21 | 23 | 20 | 21 | 18 | 13 | 14 | 15 | 13 | 15 | 14 | 14 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | SW 6 | SW 6 | SW 6 | SW 6 | WSW 10 | WSW 10 | WSW 9 | SW 8 | SW 8 | WSW 5 | SW 5 | SW 5 | WSW 4 | SW 5 | SW 6 | WSW 7 | SW 7 | SW 7 | NNW 3 |
| kJ | 11 | 5 | 6 | 2 | 2 | 1 | 10 | 9 | 16 | 18 | 14 | 34 | 12 | 6 | 6 | 7 | 8 | 5 | 2 | 2 | 1 |
Swell 2 Height (m) Direction Period (s) | NNW 3 | — | N 3 | — | — | — | SW 6 | SW 6 | SW 6 | — | WSW 9 | SW 9 | W 8 | NW 4 | SW 8 | W 8 | W 8 | — | — | — | SW 7 |
| kJ | 1 | — | 1 | — | — | — | 1 | 1 | 1 | — | 9 | 3 | 1 | 2 | 2 | 1 | 1 | — | — | — | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 11 | — | — | — | — | — | — | — | W 8 | — | — | — | — | — | — | W 7 |
| kJ | — | — | — | — | — | 3 | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 1 |
Wind waves Height (m) Direction Period (s) | — | NNW 3 | ENE 2 | ESE 2 | — | — | SSE 2 | — | — | — | — | — | NW 4 | W 4 | — | NW 3 | NW 4 | NW 2 | NNW 3 | NW 3 | — |
| kJ | — | 4 | 1 | 1 | — | — | 1 | — | — | — | — | — | 11 | 5 | — | 2 | 12 | 1 | 1 | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 303 | 306 | 254 | 321 | 329 | 113 | 113 | 130 | 125 | 126 | 303 | 138 | 139 | 308 | 113 | 125 | 306 | 153 | 303 | 306 | 317 |
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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