Surf Forecasts:
Porth Ceriad surf forecast from 31 Aug 2026:
- Best quality surf: Saturday 5 Sep, 4AM (local time) - 2ft (0.6m), 6s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 4 Sep, 1AM (local time) - 8ft (2.4m), 7s period, SW swell with 596 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 4AM (local time) - 2ft (0.6m), 6s 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 Saturday (Sep 05) at 4AM. The primary swell is predicted to be 0.6m and 6s period with a secondary swell of 0.1m and 14s. 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 2.4m 7s and forecast to arrive on Friday (Sep 04) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Saturday (Sep 05) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Sat 5th Sep) | 2ft (0.6m) 6s |
| Best Surf | 4AM (Sat 5th Sep) | 2ft (0.6m) 6s |
| Most Powerful | 1AM (Fri 4th Sep) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a long, honest look at what’s coming up for Porth Ceriad over the next couple of weeks.
Right off the bat, I’m not gonna sugarcoat it: this is a grim stretch. The entire 16-day window is basically a write-off for decent surf. From now through to the end of the forecast, every single session is scored as poor surf conditions. There’s no standout day, no window of clean, rideable waves worth paddling out for. If you’re looking for a silver lining, the water is running much warmer than normal for this time of year, sitting at 66°F with a 5°F anomaly – that’s notably warm, but it won’t help the waves.
The first week is particularly rough. From Monday 31 August through to Friday 4 September, we’ve got a mix of cross and cross-onshore winds, with speeds ranging from 15 mph up to 22 mph. Swell heights are mostly around 3 ft to 5 ft, but the periods are short – 4 to 9 seconds – and the energy is weak. On Wednesday morning 2 September the wind is straight onshore at 19 mph with only 3 ft of weak, short-period swell. On Friday 4 September morning, there’s a bit more size at 5 ft, and moderate energy (252), but it’s a fresh cross-shore wind with lumpy cross-chop. Not the kind of conditions that make you want to grab your board.
The weekend of 5 and 6 September offers a brief moment of calm. Saturday morning 5 September goes glassy with a light ENE breeze at 3 mph, and the water is clean. But the swell is tiny – only 1 ft with a combined energy of just 19 – and the period is 6 seconds. It’s flat, really. That afternoon and into Sunday, it drops even smaller, with 1.0 ft and 0.3 ft. There’s a long-period 13-second signal on Sunday, but it’s so small (0.3 ft) and onshore that it’s meaningless.
The second week doesn’t get any better. Monday 7 September afternoon actually sees offshore winds from the NNW at 12 mph, and it’s clean, but the swell is 0.3 ft – completely flat. The rest of the week is a mess: strong winds, more onshore flow, and occasional pulses of 5 ft to 6 ft on 8 and 9 September, but with gale-force cross-onshore winds up to 28 mph, it’s blown out. On Thursday 10 September morning, we’re looking at a severe gale from the WSW at 47 mph, with 5 ft of swell and total chop. That’s not surfable – it’s more of a kite-surfing setup for anyone hardy enough.
From 11 September onward, the wind turns cross-offshore or offshore, and it’s clean, but the swell is a joke: 1.0 ft to 2 ft, with periods of 4 to 6 seconds and energy in the single digits. By 13 September, there’s no swell at all. The last few days of the forecast show nothing but zeros and tiny, inconsequential waves.
So, bottom line: there’s nothing here for surfers. Porth Ceriad is consistent and exposed to SW swell, but the timing and wind are all wrong. It’s a rare stretch of blank days. The forecast might change, but for now, leave the board at home.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Tue afternoon. Very mild (max 18°C on Wed afternoon, min 15°C on Mon night). Winds increasing (light winds from the W on Mon afternoon, fresh winds from the S by Wed morning). | Days 5-7 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 20°C on Sun morning, min 12°C on Sat morning). Winds decreasing (near gales from the SW on Thu night, calm by Sat morning). | |||||||||||||||||||
Mon 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | ||||||||||||||
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 9 | WSW 8 | SW 4 | SW 5 | WSW 5 | SSW 4 | SW 6 | SW 7 | SW 7 | SW 5 | SW 7 | WSW 8 | WSW 7 | SW 6 | SW 6 | SW 6 | SW 13 | SW 13 | SW 4 | SW 5 |
Wave Graph | ||||||||||||||||||||
141 | 43 | 22 | 41 | 42 | 30 | 138 | 314 | 111 | 74 | 596 | 244 | 96 | 34 | 12 | 5 | 7 | 7 | 6 | 13 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-off | glassy | cross-on | cross-on | cross-on | on | on |
High Tide | 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 | 4:32PM3.23m | ||||||||
Low Tide | 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 | 11:30AM1.41m | 00:19AM1.15m | |||||||
— | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | |
8:09 | — | — | 8:07 | — | — | 8:05 | — | — | 8:02 | — | — | 8:00 | — | — | 7:58 | — | — | 7:55 | — | |
mm | — | — | — | 1 | 4 | 2 | 1 | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 16 | 16 | 17 | 16 | 18 | 17 | 18 | 18 | 18 | 15 | 18 | 16 | 13 | 15 | 16 | 20 | 23 | 19 |
Feels °C | 15 | 14 | 12 | 11 | 12 | 11 | 14 | 13 | 13 | 13 | 11 | 10 | 13 | 11 | 12 | 13 | 14 | 15 | 20 | 15 |
Swell 1 Height (m) Direction Period (s) | WSW 9 | WSW 8 | NW 4 | — | W 16 | W 16 | — | — | SW 14 | — | — | SW 14 | NW 5 | SW 6 | SW 6 | SW 6 | WSW 6 | WSW 4 | SW 4 | SW 5 |
141 | 43 | 1 | — | 5 | 5 | — | — | 8 | — | — | 8 | 19 | 34 | 12 | 5 | 3 | 2 | 4 | 13 | |
Swell 2 Height (m) Direction Period (s) | NW 5 | — | — | — | — | — | — | — | — | — | — | — | SW 14 | SW 14 | NW 4 | NNW 4 | W 7 | SW 13 | SW 13 | SW 12 |
25 | — | — | — | — | — | — | — | — | — | — | — | 8 | 8 | 5 | 2 | 1 | 7 | 6 | 6 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | W 14 | SW 14 | SW 8 | SW 13 | W 8 | W 8 | W 9 |
— | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 7 | 2 | 7 | 1 | 1 | 1 | |
Wind waves Height (m) Direction Period (s) | WNW 5 | NW 4 | SW 4 | SW 5 | WSW 5 | SSW 4 | SW 6 | SW 7 | SW 7 | SW 5 | SW 7 | WSW 8 | WSW 7 | NW 4 | — | — | — | SSE 2 | SSE 3 | SW 3 |
17 | 6 | 22 | 41 | 42 | 30 | 138 | 314 | 111 | 74 | 596 | 244 | 96 | 5 | — | — | — | 1 | 3 | 3 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 3 | 3 | 236 | 267 | 229 | 312 | 327 | 354 | 252 | 318 | 103 | 317 | 262 | 125 | 107 | 132 | 125 | 206 | 339 | 312 |
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.











