Surf Forecasts:
Porth Ceriad surf forecast from 30 Aug 2026:
- Most powerful swell: Friday 4 Sep, 7AM (local time) - 8ft (2.5m), 8s period, WSW swell with 804 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 8s and forecast to arrive on Friday (Sep 04) at 7AM. 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 6s period and expected on Monday (Aug 31) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Fri 4th Sep) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Right then folks, Rusty here. Let's have a look at what's on the cards for Porth Ceriad over the next couple of weeks.
Straight off the bat, I gotta say, it's a tough outlook. For the vast majority of the 16-day window, all the data is pointing to poor surf conditions. The wind and the swell just aren't getting their act together. We’ve got a long run of onshore and cross-onshore winds, and the swell energy is mostly weak to moderate. Things start looking a little more interesting right at the very end, but we've got a real dry spell to get through first.
Right now, from Sunday the 30th through to about Sunday the 13th of September, it’s mostly a no-go. The first ten days or so are particularly grim, with strong winds and messy, lumpy conditions drowning out any decent waves. The wind speeds are regularly over 20 mph, and sometimes pushing over 30 mph, just tearing the surface up.
The first actual flicker of something surfable shows up on the 13th of September, Sunday afternoon. There’s a tiny bit of swell from the WSW measuring 2 ft with a period of 9 seconds, but the energy is weak. The real story that afternoon is the wind, which goes offshore from the NNW at around 6 mph. That makes for clean conditions, so it's surfable, but very ordinary.
The standout, and the only one worth highlighting, is the morning of Monday the 14th of September. This is the best we’ve got. The wind is glassy from the north, which is an absolute dream for clean waves, and we've got a small 2 ft swell coming in from the SW with an 8-second period. The combined energy is still weak, and the waves are going to be tiny, but with glassy conditions, it'll be one for the longboard or a fun little foamy. For a beginner, this is perfect. It’s a fairly consistent spot, but the swell is small and the conditions will be clean, so crowds are likely here at Porth Ceriad. The water temperature feels about average for this time of year.
So, in short, save your energy for that Monday morning if you can. It’s not a classic, but it’s the only window where it’ll be a pleasure to be out there.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Sun afternoon. Very mild (max 17°C on Sun afternoon, min 15°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Tue night. Very mild (max 17°C on Tue night, min 14°C on Thu night). Mainly near gales. | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 8 | SW 5 | SW 8 | WSW 9 | SW 9 | WSW 8 | WSW 4 | SW 5 | SW 5 | SW 6 | SW 6 | SW 7 | SW 7 | SW 5 | WSW 7 | WSW 7 | WSW 6 | SW 7 | SW 6 | SW 7 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 72 | 66 | 104 | 138 | 118 | 67 | 17 | 51 | 48 | 244 | 233 | 335 | 217 | 129 | 502 | 671 | 179 | 47 | 163 | 493 | 279 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-off | cross | on |
High Tide | 10:14AM4.29m | 10:31PM4.67m | 10:49AM4.33m | 11:07PM4.61m | 11:27AM4.26m | 11:46PM4.43m | 12:07PM4.09m | 00:30AM4.13m | 12:53PM3.82m | 1:20AM3.76m | 1:48PM3.50m | 2:24AM3.37m | 3:01PM3.24m | 3:49AM3.13m | |||||||
Low Tide | 5:06AM0.19m | 5:11PM0.35m | 5:39AM0.26m | 5:43PM0.44m | 6:11AM0.42m | 6:15PM0.60m | 6:44AM0.65m | 6:48PM0.80m | 7:21AM0.92m | 7:31PM1.04m | 8:15AM1.21m | 8:50PM1.27m | 9:45AM1.42m | 10:41PM1.35m | |||||||
 | |  |  | |  |  | | |  | |  | |  |  | | | | | | | |
 | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — |
 | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:05 | — | — | 8:02 | — | — | 8:00 | — | — | 7:58 | — |
mm | 3 | 8 | 2 | — | — | — | — | — | 5 | 1 | — | — | — | — | — | — | 1 | — | — | — | — |
Temp °C | 16 | 17 | 16 | 15 | 16 | 17 | 16 | 16 | 17 | 17 | 17 | 17 | 16 | 17 | 17 | 15 | 17 | 15 | 13 | 14 | 16 |
Feels °C | 12 | 12 | 13 | 9 | 12 | 14 | 12 | 11 | 11 | 11 | 11 | 12 | 11 | 10 | 11 | 5 | 11 | 7 | 8 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 8 | — | SW 8 | WSW 9 | SW 9 | WNW 4 | — | — | W 16 | — | — | — | — | — | — | — | — | SW 7 | NW 4 | — | — |
| kJ | 72 | — | 104 | 138 | 118 | 1 | — | — | 5 | — | — | — | — | — | — | — | — | 47 | 1 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | SW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNW 5 | — | — | — |
| kJ | — | — | 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 15 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 3 | SW 5 | — | NW 6 | NW 5 | WSW 8 | WSW 4 | SW 5 | SW 5 | SW 6 | SW 6 | SW 7 | SW 7 | SW 5 | WSW 7 | WSW 7 | WSW 6 | — | SW 6 | SW 7 | SW 7 |
| kJ | 7 | 66 | — | 149 | 37 | 67 | 17 | 51 | 48 | 244 | 233 | 335 | 217 | 129 | 502 | 671 | 179 | — | 163 | 493 | 279 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 319 | 312 | 3 | 253 | 3 | 3 | 141 | 289 | 298 | 552 | 448 | 314 | 272 | 272 | 1022 | 785 | 494 | 494 | 126 | 3 | 47 |
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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