
Surf Forecasts:
Porth Ceriad surf forecast from 13 Sep 2026:
- Most powerful swell: Friday 18 Sep, 7PM (local time) - 8ft (2.5m), 7s period, SW swell with 653 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 2.5m 7s and forecast to arrive on Friday (Sep 18) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Thursday (Sep 17) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Fri 18th Sep) | 8ft (2.5m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, Rusty here, let’s talk about what we’ve got on the cards for this stretch.
Honestly, it’s a tough period ahead. We’re looking at a long run of days with poor surf conditions and not much to get excited about. The first real chance of anything rideable won't come until the middle of the second week, and even then, it’s going to be a tricky call. There’s a gap of several days right from the start where it’s just not worth paddling out.
The only spot in the mix is Porth Ceriad. It’s a beginner-friendly, exposed beach, and the optimum swell direction is from the SW. The water temp is sitting at 64°, which is 4° warmer than usual for the time of year – that’s noticeably warm, a little unusual, and actually quite pleasant.
Sunday, September 13th is a write-off. Tiny 2ft swell from the SW with a short 6-second period, and the wind is cross-off in the morning but goes cross-on in the afternoon. The combined energy is weak (33). Not worth looking at.
Monday, September 14th stays poor. The swell bumps up to 3ft in the morning and 3ft in the afternoon, but the period is still a short 5 seconds, and the wind is a moderate to fresh cross-onshore. That’s choppy, lumpy, and messy. Don’t bother.
Tuesday, September 15th sees the swell drop off slightly. Morning has 4ft from the WSW with a 6-second period, but the wind is a fresh cross-shore, creating lumpy cross-chop. Moderate wave energy (123). Afternoon is cleaner with a cross-off wind but the swell is down to 4ft. Still, not good enough.
Wednesday, September 16th is a weird one. Morning is tiny at 0.7ft, but the period jumps to 10 seconds – that’s a groundswell signal. Combined energy is very weak (19). Clean but not surfable.
Thursday, September 17th – this is the first possible standout, but it’s a caveat. The morning has 5ft from the W, a 6-second period, clean conditions with a cross-off wind, and a combined energy of 160 (moderate). This is the biggest swell so far, but the period is short. The afternoon gets messy again with cross-onshore wind. If you’re an experienced surfer, the morning might offer some lumpy but clean lines. For beginners, 5ft might be a bit much.
Friday, September 18th gets more size, but the wind kills it. 5ft in the morning from the W, clean cross-off wind, 6-second period, energy at 175. Afternoon jumps to 7ft from the SW with a 7-second period, but the wind is a near gale cross-onshore, making it blown out and dangerous. Not good.
Saturday, September 19th is all over the place. Morning has 3ft from the SW, strong cross-shore wind, messy. Afternoon has 6ft from the SW with a 7-second period, fresh cross-shore, lumpy. The energy is high (318) but the quality is terrible. This looks more like a kite-surfing setup than a paddle-surfing one.
Sunday, September 20th through Thursday, September 24th is more of the same – tiny swell, poor conditions, or flat. Wednesday, September 23rd even shows no waves at all.
Friday, September 25th stays small and weak.
Saturday, September 26th is a late glimmer. The afternoon turns glassy with 2ft from the SW and a 4-second period. Combined energy is weak (20). It’s clean, but very small and slow. Great for a longboard if you’re desperate.
Sunday, September 27th and Monday, September 28th finish with tiny, weak, long-period swell (13 seconds) from the W. Clean but barely breaking.
So, if I have to call a standout, it’s the morning of Thursday, September 17th at Porth Ceriad. 5ft from the W, clean cross-off wind, and the most consistent-looking energy of the whole period (160). It’s not perfect, but it’s the best on offer for the experienced crew. For the beginners, it’s worth waiting to see if any of the tiny glassy periods later in the second week firm up, but don’t hold your breath.
Stay patient, folks.
- Rusty
Short Range ForecastLight rain (total 7mm), mostly falling on Mon night. Very mild (max 18°C on Mon afternoon, min 13°C on Tue night). Winds increasing (calm on Sun morning, strong winds from the SSW by Mon night). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Wed night. Very mild (max 17°C on Fri afternoon, min 13°C on Wed morning). Winds increasing (light winds from the WSW on Wed afternoon, near gales from the SW by Fri afternoon). | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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 5 | SW 5 | SW 6 | WSW 6 | W 5 | WSW 6 | SW 6 | NW 6 | SW 5 | W 6 | W 5 | W 6 | W 6 | SW 7 | WSW 7 | SW 7 | SW 7 | SW 7 |
Wave Graph | |||||||||||||||||||||
33 | 32 | 38 | 29 | 44 | 210 | 123 | 77 | 26 | 10 | 36 | 67 | 160 | 120 | 158 | 175 | 381 | 302 | 93 | 318 | 211 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-on | cross-off | cross-on | cross-on | cross | cross | cross | cross |
High Tide | 10:10AM4.47m | 10:28PM4.72m | 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 | |||||||
Low Tide | 5:10PM0.20m | 5:34AM0.22m | 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 | ||||||||
6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | |
— | 7:38 | — | — | 7:37 | — | — | 7:34 | — | — | 7:31 | — | — | 7:29 | — | — | 7:27 | — | — | 7:24 | — | |
mm | — | — | — | — | — | 7 | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 17 | 17 | 18 | 18 | 15 | 17 | 16 | 13 | 16 | 16 | 14 | 16 | 15 | 15 | 17 | 16 | 15 | 16 | 15 |
Feels °C | 18 | 17 | 17 | 16 | 13 | 13 | 10 | 13 | 11 | 6 | 12 | 11 | 8 | 11 | 9 | 7 | 10 | 8 | 7 | 9 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | — | W 12 | — | — | — | — | WSW 6 | SW 6 | NW 6 | NNW 5 | — | — | — | — | NW 5 | — | NW 5 | — | SW 7 |
33 | 32 | — | 3 | — | — | — | — | 26 | 9 | 36 | 2 | — | — | — | — | 4 | — | 19 | — | 211 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 8 | WSW 10 | WSW 7 | — | — | — | — | — | — | — | W 16 | — | — |
— | — | — | — | — | — | — | — | 15 | 10 | 10 | — | — | — | — | — | — | — | 5 | — | — | |
Swell 3 Height (m) Direction Period (s) | — | W 13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | SW 6 | SW 5 | SW 5 | SW 6 | WSW 6 | W 5 | NW 5 | NW 6 | WSW 5 | SW 5 | W 6 | W 5 | W 6 | W 6 | SW 7 | WSW 7 | SW 7 | SW 7 | NW 4 |
— | — | 38 | 29 | 44 | 210 | 123 | 77 | 107 | 123 | 13 | 67 | 160 | 120 | 158 | 175 | 381 | 302 | 93 | 318 | 4 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 189 | 252 | 252 | 252 | 252 | 252 | 494 | 571 | 291 | 291 | 3 | 298 | 319 | 318 | 126 | 502 | 785 | 785 | 844 | 262 | 262 |
Best forecast wave conditions in Lleyn Peninsula | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











