Surf Forecasts:
Porth Ceriad surf forecast from 24 Aug 2026:
- Most powerful swell: Monday 31 Aug, 10AM (local time) - 4ft (1.2m), 11s period, SW swell with 328 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 1.2m 11s and forecast to arrive on Monday (Aug 31) 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 1.9m 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 | 10AM (Mon 31st Aug) | 4ft (1.2m) 11s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, let’s take a look at what’s coming up over the next couple weeks.
We’ve got a real slow start here. There’s a big gap with nothing worth paddling out for. The first tiny bit of surf doesn’t show up until Friday the 28th of August, and it’s barely a ripple. The first several days are flat or close to it.
The only break we’re talking about is Porth Ceriad. It’s a beginner-friendly spot, fairly consistent, and exposed to the southwest. The water temp is 65°, which is much warmer than normal for this time of year – over two degrees above average, so that’s a real standout.
On the morning of Friday the 28th, there’s a little bump of swell, about 3ft from the southwest, but the period is short at 8 seconds and the energy is weak (86). The wind is cross-shore, so it’ll be a bit choppy. Not worth getting excited about. The afternoon drops off even more.
Saturday the 29th is similar – tiny, weak, and onshore wind. Not good.
Sunday the 30th gets messy. The morning is onshore and bumpy with 2ft. By the afternoon, the wind is howling onshore from the south at 35 km/h with 5ft of short-period chop. The energy hits 164 (moderate), but the wind will ruin it. This is more of a kite-surfing kind of day.
Monday the 31st brings more size. The morning has 4ft from the southwest with a nice long 11-second period and moderate energy at 328. But the wind is cross-shore, so there’s chop. The afternoon has 5ft from the northwest, but again, cross-shore wind. For a beginner spot, 4-5ft is getting big, and the quality isn’t there.
Tuesday the 1st of September morning has a light offshore wind from the NNW, but only 1ft of swell. Clean but tiny. The afternoon goes onshore again.
Wednesday the 2nd September morning is clean with a cross-offshore breeze and 3ft from the west-southwest. Energy is low (68), but it’s the cleanest we’ve seen. The afternoon is similar with 3ft and clean. It’s surfable, but very average.
Then things get bigger but messier. Thursday the 3rd is blown out with strong onshore winds, and Friday the 4th is lumpy and choppy.
The one real standout is Sunday the 6th of September. The afternoon brings a solid 12ft of southwest swell with a 9-second period. The energy is massive at 2080 – that’s strong stuff. The wind is cross-shore, not perfect, but manageable. At that size, it’s for experts only. If you know this break and are experienced, that afternoon could be a proper session. But it’s over a week away, so the forecast is promising but not locked in.
Monday the 7th September still has size – 8ft in the morning and 5ft in the afternoon with a very long 17-second period. That groundswell will have heaps of power, but at a beach break, that long period can make waves close out or run straight. The wind is fresh and cross-shore, so it’ll be lumpy.
After that, it fades. By Tuesday the 8th, we’re back to small, clean but weak conditions.
So, the pick of the window? For experts only, the 6th of September afternoon. For everyone else, it’s a quiet outlook. The start is a write-off, and even the better days have wind or size issues.
Stay patient. It usually doesn’t stay this quiet for long.
Rusty
Short Range ForecastMostly dry. Warm (max 22°C on Mon afternoon, min 15°C on Mon morning). Winds decreasing (fresh winds from the E on Tue night, calm by Wed afternoon). | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Sat afternoon. Very mild (max 18°C on Thu afternoon, min 15°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
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 10 | SW 13 | ESE 4 | SW 13 | SW 13 | SW 13 | SSW 8 | SSW 8 | W 12 | SW 12 | SW 12 | SW 8 | SW 8 | SW 7 | SW 7 | SW 5 | SW 6 | SW 5 | SW 6 | SW 6 | SW 7 |
Wave Graph | |||||||||||||||||||||
9 | 7 | 10 | 7 | 7 | 7 | 6 | 6 | 3 | 6 | 6 | 57 | 86 | 27 | 11 | 23 | 11 | 28 | 36 | 164 | 134 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | off | cross | cross | cross-off | cross | cross-on | glassy | cross-off | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-on | cross-on | cross-off | on | on | cross-on |
High Tide | 7:07PM3.26m | 7:28AM3.22m | 7:46PM3.59m | 8:04AM3.49m | 8:20PM3.91m | 8:37AM3.75m | 8:52PM4.21m | 9:08AM3.98m | 9:23PM4.45m | 9:41AM4.17m | 9:56PM4.61m | 10:14AM4.29m | 10:31PM4.67m | ||||||||
Low Tide | 1:44PM1.32m | 2:15AM1.10m | 2:25PM1.03m | 2:53AM0.81m | 3:01PM0.77m | 3:27AM0.54m | 3:34PM0.55m | 4:01AM0.34m | 4:07PM0.40m | 4:34AM0.22m | 4:39PM0.34m | 5:06AM0.19m | 5:11PM0.35m | ||||||||
6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | |
— | 8:25 | — | — | 8:22 | — | — | 8:21 | — | — | 8:19 | — | — | 8:16 | — | — | 8:14 | — | — | 8:12 | — | |
mm | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | 1 | — | 8 | 1 | 1 | 5 | 4 |
Temp °C | 18 | 22 | 19 | 17 | 19 | 21 | 20 | 21 | 20 | 17 | 18 | 17 | 16 | 17 | 17 | 16 | 16 | 17 | 17 | 18 | 17 |
Feels °C | 17 | 18 | 13 | 13 | 16 | 15 | 20 | 22 | 20 | 16 | 18 | 16 | 14 | 15 | 16 | 13 | 13 | 15 | 13 | 12 | 10 |
Swell 1 Height (m) Direction Period (s) | WSW 10 | — | SW 13 | SW 13 | SW 8 | SW 8 | SSW 8 | SSW 8 | SW 7 | S 3 | S 7 | WSW 8 | — | SW 7 | SW 7 | NW 5 | SW 6 | SW 5 | SW 6 | — | SW 7 |
9 | — | 7 | 7 | 3 | 3 | 6 | 6 | 2 | 1 | 1 | 6 | — | 27 | 11 | 20 | 11 | 28 | 36 | — | 118 | |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 9 | SW 9 | SW 8 | SW 13 | SW 13 | W 13 | — | — | SW 7 | SW 12 | — | — | SW 5 | — | W 8 | NW 5 | NW 4 | — | — | — |
8 | 3 | 3 | 3 | 7 | 7 | 3 | — | — | 2 | 6 | — | — | 11 | — | 1 | 5 | 1 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | SW 13 | — | — | — | — | — | W 12 | W 12 | SW 12 | — | — | — | — | — | — | — | — | — | — | — |
— | 7 | — | — | — | — | — | 3 | 3 | 6 | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SE 3 | — | ESE 4 | E 3 | E 3 | E 3 | ESE 3 | — | — | — | — | SW 8 | SW 8 | WNW 4 | NW 5 | SW 5 | — | — | SSE 3 | SW 6 | WSW 7 |
2 | — | 10 | 3 | 1 | 7 | 2 | — | — | — | — | 57 | 86 | 21 | 51 | 23 | — | — | 3 | 164 | 134 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 298 | 301 | 273 | 254 | 213 | 134 | 263 | 213 | 312 | 253 | 125 | 3 | 3 | 200 | 139 | 132 | 303 | 314 | 294 | 312 | 298 |
Best forecast wave conditions in Lleyn Peninsula | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.











