
Surf Forecasts:
Porth Ceriad surf forecast from 4 Sep 2026:
- Most powerful swell: Monday 7 Sep, 10AM (local time) - 3.5ft (1.1m), 14s period, WSW swell with 446 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 1.1m 14s and forecast to arrive on Monday (Sep 07) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 5s period and expected on Tuesday (Sep 08) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Mon 7th Sep) | 3.5ft (1.1m) 14s |
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. I gotta be straight with you, this stretch of the 16-day window is a real struggle. There are no standout sessions, no green lights, nothing that gets the heart pumping. The whole forecast is a bit of a write-off, to be honest. The swell is either too small, too wind-chopped, or just plain messy. The first few days are a complete loss.
We kick off on Friday the 4th with a cloudy, windy mess. A 6ft WSW swell is being shredded by a 25 mph cross-wind, making for poor surf. Combined swell energy is only 173 (moderate), but it's all over the shop. The water is a balmy 64°, which is 4° warmer than usual for this time of year, so that's a bit of a bonus for a paddle, but the surf is unsurfable.
Saturday the 5th is clear but tiny, with 2ft to 2ft SW swell and cross-shore winds. No good.
Sunday the 6th brings a bit more size, 4ft, but it's onshore and choppy.
Monday the 7th is interesting in a cruel way. A 3ft WSW groundswell with a very long 14-second period rolls in, and the combined energy jumps to 485 (strong energy). But the wind is cross-shore, ruining the potential of that long-period energy. It's a tease.
Tuesday the 8th is a no-go with 7ft of lumpy, cross-shore chop. That's too big for beginners and the conditions are foul for everyone.
The rest of the first week is more of the same; small, onshore, or cross-shore junk. There's a hint of a clean window on Friday the 11th morning with a 3ft SW swell and a cross-offshore breeze, but it's just too small to get excited about.
The second week starts with a couple of days of offshore winds on Saturday the 12th and Sunday the 13th, but the swell is basically non-existent – 1.0ft and 0.3ft. Glassy, but flat.
Then on Monday the 14th, a strong 28 mph onshore wind blows through with a 5ft swell – a total mess again.
On Tuesday the 15th, things look a touch better on paper. A 7ft WSW swell with a clean cross-offshore wind. The combined energy is 443 (strong). But the period is only 7 seconds, so it's a windswell, not a proper groundswell. It'll be lumpy and won't have any real push. It's big enough for some experienced surfers to get a few close-outs, but nothing to write home about.
The final few days are tiny and clean, with a 2ft on Thursday the 17th and a glassy 0.3ft on Saturday the 19th. The 19th afternoon is flat calm, glassy, but barely a ripple.
So, to sum it up: there's no best session, no real standouts. The entire 16-day forecast is a dud for quality surf. If you're a kite surfer, the strong cross-shore winds on the 8th and 14th might be worth a look, but for a paddle surfer, leave the board at home. The forecasts can change, but right now, this is a blank run.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Sat night. Very mild (max 19°C on Sun morning, min 14°C on Fri night). Winds decreasing (strong winds from the WSW on Fri morning, light winds from the WSW by Sat morning). | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Wed night. Very mild (max 16°C on Mon afternoon, min 13°C on Mon night). Winds decreasing (strong winds from the SW on Mon afternoon, light winds from the SW by Wed morning). | ||||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | |||||||||||||||
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) | WSW 8 | WSW 6 | W 5 | WSW 6 | WSW 6 | SSW 4 | SSW 5 | SW 6 | SW 6 | WSW 14 | SW 6 | WSW 6 | WSW 6 | WSW 6 | W 6 | W 5 | W 5 | SW 5 | SW 6 | SW 7 | WSW 5 |
Wave Graph | |||||||||||||||||||||
345 | 160 | 115 | 44 | 23 | 10 | 49 | 84 | 92 | 446 | 176 | 223 | 173 | 148 | 0 | 0 | 60 | 77 | 151 | 136 | 77 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross | cross-on | on | on | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 1:48PM3.50m | 2:24AM3.37m | 3:01PM3.24m | 3:49AM3.13m | 4:32PM3.23m | 5:21AM3.19m | 5:54PM3.50m | 6:32AM3.46m | 6:56PM3.92m | 7:27AM3.80m | 7:46PM4.33m | 8:12AM4.10m | 8:30PM4.65m | ||||||||
Low Tide | 8:50PM1.27m | 9:45AM1.42m | 10:41PM1.35m | 11:30AM1.41m | 00:19AM1.15m | 12:52PM1.16m | 1:31AM0.77m | 1:53PM0.82m | 2:25AM0.38m | 2:41PM0.50m | 3:11AM0.08m | 3:23PM0.27m | 3:51AM-0.09m | ||||||||
6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:37 | — | — | 6:39 | — | — | 6:39 | — | — | 6:41 | — | — | |
— | 8:00 | — | — | 7:58 | — | — | 7:55 | — | — | 7:52 | — | — | 7:51 | — | — | 7:49 | — | — | 7:45 | — | |
mm | — | — | — | — | — | 7 | — | — | — | — | — | 1 | — | 2 | — | — | — | 7 | — | — | — |
Temp °C | 16 | 17 | 16 | 14 | 15 | 15 | 19 | 19 | 17 | 15 | 16 | 14 | 14 | 16 | 14 | 14 | 15 | 16 | 17 | 19 | 17 |
Feels °C | 9 | 11 | 9 | 12 | 12 | 11 | 14 | 14 | 13 | 11 | 10 | 6 | 5 | 9 | 6 | 9 | 9 | 14 | 15 | 14 | 11 |
Swell 1 Height (m) Direction Period (s) | — | NW 5 | SW 14 | NW 5 | NW 4 | WSW 6 | SW 13 | SW 13 | W 17 | — | — | — | — | — | — | — | NW 5 | — | — | — | — |
— | 12 | 8 | 19 | 7 | 4 | 7 | 6 | 5 | — | — | — | — | — | — | — | 21 | — | — | — | — | |
Swell 2 Height (m) Direction Period (s) | — | — | — | SW 14 | SW 13 | SW 13 | W 13 | — | W 12 | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | 7 | 7 | 7 | 3 | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SW 13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | WSW 8 | WSW 6 | W 5 | WSW 6 | WSW 6 | SSW 4 | SSW 5 | SW 6 | SW 6 | WSW 14 | SW 6 | WSW 6 | WSW 6 | WSW 6 | W 6 | W 5 | W 5 | SW 5 | SW 6 | SW 7 | WSW 5 |
345 | 160 | 115 | 44 | 23 | 10 | 49 | 84 | 92 | 446 | 176 | 223 | 173 | 148 | 144 | 95 | 60 | 77 | 151 | 136 | 77 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 253 | 460 | 126 | 138 | 236 | 132 | 184 | 295 | 70 | 3 | 272 | 120 | 750 | 460 | 376 | 317 | 303 | 303 | 137 | 272 | 494 |
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.










