Surf Forecasts:
Porth Ceriad surf forecast from 14 Sep 2026:
- Most powerful swell: Saturday 19 Sep, 1AM (local time) - 5.5ft (1.7m), 6s period, SW swell with 219 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 1.7m 6s and forecast to arrive on Saturday (Sep 19) at 1AM. 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 6s period and expected on Wednesday (Sep 16) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Sat 19th Sep) | 5.5ft (1.7m) 6s |
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 about this forecast period for Porth Ceriad. It’s a bit of a rough stretch, plain and simple. We’re looking at a run of poor to non-existent surf for most of the next couple of weeks. The water’s sitting at a very warm 64°, which is a good 4° warmer than we’d normally see this time of year – that’s a notable bump, so keep the springy wetsuit in the car.
The first week, starting Monday the 14th, is all about onshore and cross-onshore winds. The swell is there on paper – around 3ft to 5ft plus – but it’s messy and chopped up. The wave energy is weak, sitting in the low to mid-range of the scale. We’re looking at short-period windswell, which is just mush. Monday’s a write-off. Tuesday the 15th offers a bit more size, up to 4ft, and that cross-offshore wind cleans it up slightly, but it’s still poor quality. Nothing surfable here for us.
We hit a bit of a lull around the 20th, with some small stuff, but it’s glassy and clean on Sunday morning the 21st – just ankle-biters though, 1ft at most. The rest of the first week is pretty bleak, with the biggest swell on the 19th being 6ft but with a fresh cross-onshore wind making it a complete mess. There are gaps of a day or two where it’s just flat, like the 22nd and 23rd. The only real standout in that window is Thursday the 24th, when it turns glassy. But the swell is tiny, 0.6ft. It’s not worth getting wet for.
Going deeper into the second week, things just die. From the 25th to the 29th, we see mostly tiny, weak swells under 2ft. There is a promising pulse on the 29th of September, with a 3ft ESE swell and light, glassy winds in the afternoon. But it’s a short period, just 4 seconds, so it’s weak and lacking any push. The wave energy is minimal. That’s about the best we get, and it’s not saying much. Porth Ceriad is exposed to that SW swell, but none of this is doing it any favors. This is one of those stretches where you’re better off leaving the board in the van. Forecasts can change, but right now, this is a poor run of luck for the area.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Mon night. Very mild (max 18°C on Mon night, min 13°C on Tue night). Mainly strong winds. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri afternoon. Very mild (max 18°C on Sat night, min 13°C on Thu night). Mainly fresh winds. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 5 | SW 5 | SW 6 | WSW 5 | WSW 5 | SW 6 | WSW 6 | WNW 5 | SW 5 | WSW 6 | W 5 | W 11 | W 5 | SW 5 | SW 6 | SW 6 | SW 6 | SW 6 | SW 5 | SW 5 | SW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 32 | 51 | 212 | 94 | 84 | 34 | 22 | 0 | 49 | 155 | 75 | 3 | 44 | 54 | 219 | 212 | 178 | 109 | 47 | 27 | 14 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross | cross | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on |
High Tide | 10:46AM4.37m | 11:05PM4.46m | 11:22AM4.16m | 11:41PM4.11m | 11:57AM3.87m | 00:18AM3.70m | 12:34PM3.53m | 00:57AM3.28m | 1:15PM3.17m | 1:45AM2.89m | 2:13PM2.85m | 3:05AM2.60m | 4:04PM2.70m | ||||||||
Low Tide | 5:41PM0.37m | 6:02AM0.51m | 6:10PM0.60m | 6:28AM0.82m | 6:38PM0.87m | 6:53AM1.13m | 7:13PM1.16m | 7:27AM1.41m | 8:05PM1.45m | 8:28AM1.66m | 9:31PM1.65m | 10:10AM1.77m | 11:24PM1.64m | ||||||||
 | |  | |  | | |  | | | |  | |  |  | | | | |  |  | |
 | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — |
 | — | 7:37 | — | — | 7:34 | — | — | 7:31 | — | — | 7:29 | — | — | 7:27 | — | — | 7:24 | — | — | 7:22 | — |
mm | — | — | 8 | — | 1 | 2 | 1 | — | 1 | — | — | — | — | 1 | — | 1 | — | — | — | — | — |
Temp °C | 17 | 17 | 18 | 14 | 16 | 16 | 13 | 15 | 15 | 14 | 15 | 15 | 14 | 15 | 16 | 16 | 16 | 18 | 18 | 18 | 18 |
Feels °C | 15 | 12 | 13 | 8 | 11 | 11 | 6 | 10 | 9 | 7 | 9 | 8 | 10 | 8 | 11 | 12 | 12 | 16 | 17 | 17 | 16 |
Swell 1 Height (m) Direction Period (s) | W 12 | — | — | — | — | SW 6 | WSW 6 | NNW 5 | NNW 5 | — | — | W 11 | — | NW 4 | — | — | — | W 14 | W 14 | W 14 | SW 5 |
| kJ | 3 | — | — | — | — | 34 | 22 | 36 | 2 | — | — | 3 | — | 3 | — | — | — | 4 | 4 | 4 | 14 |
Swell 2 Height (m) Direction Period (s) | W 12 | — | — | — | — | — | WSW 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | W 14 |
| kJ | 3 | — | — | — | — | — | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 5 | SW 6 | WSW 5 | WSW 5 | NW 5 | NW 6 | WNW 5 | SW 5 | WSW 6 | W 5 | W 5 | W 5 | SW 5 | SW 6 | SW 6 | SW 6 | SW 6 | SW 5 | SW 5 | — |
| kJ | 32 | 51 | 212 | 94 | 84 | 84 | 136 | 41 | 49 | 155 | 75 | 77 | 44 | 54 | 219 | 212 | 178 | 109 | 47 | 27 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 252 | 252 | 252 | 494 | 494 | 126 | 141 | 303 | 307 | 317 | 494 | 126 | 138 | 373 | 252 | 252 | 252 | 47 | 252 | 252 | 125 |
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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