
Surf Forecasts:
Porth Ceriad surf forecast from 11 Sep 2026:
- Best quality surf: Sunday 13 Sep, 4AM (local time) - 3.5ft (1.0m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 12 Sep, 4PM (local time) - 7ft (2.1m), 7s period, SW swell with 374 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 4AM (local time) - 3.5ft (1.0m), 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 4AM. The primary swell is predicted to be 1.0m and 7s period with a secondary swell of 0.9m and 7s. 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 2.1m 7s and forecast to arrive on Saturday (Sep 12) at 4PM. 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+) | 4AM (Sun 13th Sep) | 3.5ft (1.0m) 7s |
| Best Surf | 4AM (Sun 13th Sep) | 3.5ft (1.0m) 7s |
| Most Powerful | 4PM (Sat 12th Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, let me have a look at what's goin' on. It's a pretty bleak picture for Porth Ceriad over the next couple of weeks. I'm not seeing the kind of setup that gets a local frothing. There are no real standout days, just a long stretch of small, wind-affected, or just plain flat conditions. Let's be honest, if you're hanging your hat on a session here in the next 16 days, you're going to be disappointed most of the time.
We start off this Friday morning, the 11th, with some knee-high, 2ft swell from the southwest. The wind is a cross-off from the northwest at 12 mph, which keeps the surface clean, but the wave energy is weak (47). The water is sitting at 64°, which is about 4° warmer than usual for this time of year, so that's a bit of a surprise. Still, it's just small and weak.
Saturday the 12th is a write-off. That southwest wind is howling at 22 to 25 mph, creating a messy, cross-onshore slop. The swell jumps up to 6ft to 7ft with a short, weak period of 6-7 seconds, creating a moderate wave energy (236-374). It's poor.
Sunday the 13th drops right back down to ankle-biters around 2ft to 2ft. Wind dies off, but the swell is just gone.
Monday and Tuesday (14th & 15th) are more of the same story: tiny, weak swell with the wind ruining any chance of it being surfable. We're stuck below 3ft with weak energy.
There's a tiny flicker on Thursday the 17th, where we see a bit more size, with the swell hitting 5ft to 6ft from the west-southwest. The wind goes offshore from the west-northwest, so it should be clean. It's a moderate wave energy (178-200). But the period is only 6 seconds, so it's going to be a bit lumpy and lack any real punch. It's still marked as poor.
After that, it's a long, slow fade into the abyss. We're talking about days of swell under 3ft, and from the 21st through to the 26th of September, it's basically flat with zero wave energy. There's a 16-second period groundswell on the 26th, but it's a pathetic 0.3ft.
Honestly, for a wave this exposed, the run of poor conditions is unusual, but it's the hand we've been dealt. If you absolutely have to get wet, Thursday the 17th is your best bet for some clean waves that at least have a bit of weight to them, but don't expect anything special. For beginners, the whole window is too small or too messy. For advanced crew, there's nothing to get excited about here.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Sat morning. Very mild (max 17°C on Sat afternoon, min 14°C on Fri morning). Mainly strong winds. | Days 4-6 Weather SummaryModerate rain (total 19mm), heaviest on Mon night. Very mild (max 18°C on Mon morning, min 13°C on Mon night). Winds increasing (light winds from the NNW on Mon night, strong winds from the WSW by Wed night). | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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 | WSW 8 | SW 8 | SW 6 | SW 7 | SW 7 | SW 7 | SW 6 | SW 6 | SW 5 | SW 6 | SW 6 | SW 6 | SW 5 | SW 6 | SW 7 | WSW 5 | WSW 5 | WSW 6 | WSW 6 | WSW 7 |
Wave Graph | |||||||||||||||||||||
47 | 44 | 63 | 236 | 374 | 135 | 35 | 20 | 10 | 94 | 111 | 132 | 36 | 14 | 5 | 12 | 3 | 69 | 178 | 200 | 83 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-on | cross-on | cross-on | cross-on | cross-off | cross-on | on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-off | cross-off | cross-off |
High Tide | 9:11PM4.83m | 9:33AM4.45m | 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 | ||||||||
Low Tide | 4:02PM0.14m | 4:29AM-0.11m | 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 | ||||||||
6:43 | — | — | 6:45 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | |
— | 7:44 | — | — | 7:40 | — | — | 7:38 | — | — | 7:37 | — | — | 7:34 | — | — | 7:31 | — | — | 7:29 | — | |
mm | — | — | — | 4 | 2 | 1 | — | — | — | 3 | — | 14 | — | — | — | — | — | 2 | — | — | — |
Temp °C | 15 | 15 | 16 | 16 | 17 | 17 | 16 | 16 | 17 | 18 | 18 | 17 | 15 | 16 | 15 | 13 | 15 | 16 | 14 | 15 | 15 |
Feels °C | 12 | 13 | 9 | 10 | 12 | 15 | 16 | 15 | 15 | 15 | 14 | 12 | 11 | 12 | 9 | 8 | 9 | 10 | 7 | 9 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 7 | WSW 8 | NW 4 | — | — | SW 7 | SW 7 | SW 6 | SW 6 | — | — | W 12 | SW 6 | SW 5 | SW 6 | SW 7 | WSW 5 | — | — | — | WSW 7 |
47 | 44 | 1 | — | — | 135 | 35 | 20 | 10 | — | — | 3 | 36 | 14 | 5 | 12 | 3 | — | — | — | 83 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | W 11 | W 11 | — | W 9 | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | — | 2 | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NW 4 | NW 4 | SW 8 | SW 6 | SW 7 | — | — | — | SW 3 | SW 5 | SW 6 | SW 6 | NW 4 | NW 4 | NW 5 | NW 6 | NW 5 | WSW 5 | WSW 6 | WSW 6 | NW 4 |
10 | 8 | 63 | 236 | 374 | — | — | — | 2 | 94 | 111 | 132 | 2 | 7 | 124 | 88 | 28 | 69 | 178 | 200 | 23 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 126 | 0 | 236 | 252 | 290 | 143 | 126 | 126 | 132 | 252 | 252 | 225 | 138 | 1565 | 138 | 141 | 460 | 727 | 494 | 494 | 126 |
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.











