Surf Forecasts:
Porth Ceriad surf forecast from 12 Sep 2026:
- Best quality surf: Sunday 13 Sep, 7AM (local time) - 2.5ft (0.8m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 12 Sep, 1PM (local time) - 7.5ft (2.3m), 7s period, SW swell with 529 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 7AM (local time) - 2.5ft (0.8m), 7s period with SW swell.
Best Forecast Surf Conditions for Porth Ceriad this week:
The surf forecast for Porth Ceriad over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 13) at 7AM. The primary swell is predicted to be 0.8m and 7s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Porth Ceriad in the next 16 days are 2.3m 7s and forecast to arrive on Saturday (Sep 12) at 1PM. 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 Wednesday (Sep 16) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Sun 13th Sep) | 2.5ft (0.8m) 7s |
| Best Surf | 7AM (Sun 13th Sep) | 2.5ft (0.8m) 7s |
| Most Powerful | 1PM (Sat 12th Sep) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Right then, let’s have a look at what’s on offer for Porth Ceriad over the next couple of weeks. I’ll be honest with you, it’s a bit of a grim picture for us here. We’ve got a proper nothingburger of a forecast on our hands.
The first solid bit of swell we see isn’t until the 20th of September, but that’s a write-off. We’re looking at a strong 7ft to 8ft SW swell with a period of 6 to 8 seconds, but it comes with a near gale-force cross-onshore wind of 22 to 31 mph. That’s completely blown out, absolute whitecaps and washing machine conditions. Not even worth getting the wetsuit on for.
Before that, we’ve got a full week of almost nothing. From the 12th right through to the 19th, the combined swell energy barely gets into double digits most days, sitting around 20 to 119 (weak to low-end moderate). The swell is tiny, mostly below 4ft and short period, and when there is any size it’s hammered by cross-onshore winds. Even the cleaner days on the 15th and 16th with offshore and cross-off winds only offer knee-high dribble of 1ft to 2ft. It’s just not happening.
The only glimmer in this whole outlook is the morning of the 21st of September. It’s a day late, after the storm, but we get a little 2ft SW groundswell with a 7-second period and a light offshore breeze from the NE at 3 mph. The combined energy is still weak at 54, but the winds are clean, the water is glassy, and the break will be clean. For a beginner spot that’s normally pretty forgiving, this is the one moment you could actually catch a little wave without fighting a gale. It’s not a standout by any stretch, but in this run, it’s the best we’ve got.
After that, it’s a slow slide back into nothing. The 22nd onward shows tiny, weak swells with poor winds again. Really, the entire 16-day window is a dud. For an exposed spot like this, that’s a long, dry spell.
Stay patient, lads. Blank runs like this are part of the deal sometimes. Forecasts can change, but for now, if you’re desperate, pencil in the early morning of the 21st.
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Sat morning. Very mild (max 18°C on Sun morning, min 16°C on Sat morning). Winds decreasing (strong winds from the SW on Sat morning, light winds from the WNW by Sat night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Tue afternoon, min 13°C on Tue night). Winds increasing (light winds from the W on Tue afternoon, strong winds from the WSW by Wed night). | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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 7 | SW 7 | WSW 7 | SW 6 | SW 6 | SW 6 | SW 5 | SW 5 | SW 6 | SW 6 | SW 6 | SW 6 | SW 6 | WSW 7 | WSW 4 | W 6 | W 5 | W 5 | WSW 4 | SW 5 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 374 | 440 | 153 | 34 | 20 | 10 | 69 | 93 | 146 | 85 | 38 | 10 | 8 | 10 | 34 | 119 | 60 | 50 | 36 | 51 | 129 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | off | cross | on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-off | cross | cross-off | cross | cross-on | cross-on |
High Tide | 9:50PM4.85m | 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 | ||||||||
Low Tide | 4:37PM0.12m | 5:03AM0.00m | 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 | ||||||||
 |  |  |  | | |  | |  | |  | | | | | | | | | | | |
 | 6:45 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — |
 | — | 7:40 | — | — | 7:38 | — | — | 7:37 | — | — | 7:34 | — | — | 7:31 | — | — | 7:29 | — | — | 7:27 | — |
mm | 9 | 1 | — | — | — | — | — | — | 6 | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 16 | 17 | 17 | 18 | 17 | 17 | 17 | 18 | 17 | 15 | 16 | 15 | 13 | 15 | 16 | 14 | 16 | 15 | 14 | 15 | 16 |
Feels °C | 8 | 12 | 15 | 18 | 16 | 16 | 15 | 14 | 12 | 11 | 13 | 8 | 7 | 10 | 11 | 7 | 11 | 8 | 9 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 7 | SW 6 | SW 6 | SW 6 | W 12 | — | W 12 | SW 6 | SW 6 | SW 6 | SW 6 | SW 5 | NNW 5 | — | — | W 13 | NW 4 | — | — |
| kJ | — | — | 132 | 34 | 20 | 10 | 3 | — | 3 | 85 | 38 | 10 | 8 | 7 | 2 | — | — | 3 | 5 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | NW 4 | — | — | — | — | — | — | — | — | SW 8 | WSW 7 | NW 4 | — | — | — | — | — | — |
| kJ | — | — | — | 1 | — | — | — | — | — | — | — | — | 2 | 10 | 1 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 7 | SW 7 | WSW 7 | — | — | SW 3 | SW 5 | SW 5 | SW 6 | NW 4 | NW 5 | NW 5 | NW 6 | NW 5 | WSW 4 | W 6 | W 5 | W 5 | WSW 4 | SW 5 | SW 6 |
| kJ | 374 | 440 | 153 | — | — | 2 | 69 | 93 | 146 | 20 | 25 | 84 | 96 | 30 | 34 | 119 | 60 | 50 | 36 | 51 | 129 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 303 | 354 | 43 | 126 | 135 | 236 | 252 | 252 | 229 | 126 | 138 | 138 | 138 | 289 | 307 | 317 | 494 | 318 | 252 | 303 | 252 |
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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