Surf Forecasts:
Porth Ceriad surf forecast from 28 Aug 2026:
- Best quality surf: Sunday 30 Aug, 1AM (local time) - 3ft (0.9m), 9s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 3 Sep, 1PM (local time) - 8ft (2.4m), 7s period, SW swell with 566 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 1AM (local time) - 3ft (0.9m), 9s 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 (Aug 30) at 1AM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.4m and 4s. 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 Thursday (Sep 03) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Monday (Aug 31) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sun 30th Aug) | 3ft (0.9m) 9s |
| Best Surf | 1AM (Sun 30th Aug) | 3ft (0.9m) 9s |
| Most Powerful | 1PM (Thu 3rd Sep) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
IMPERIAL
Alright folks, Rusty here. Let's be straight with you. This 16-day stretch for Porth Ceriad is a tough one to call. There are a couple of glimmers, but honestly, you’ll be waiting a long time for anything decent. The water’s sitting at a very unusual 66° – that’s over 5° warmer than normal for this time of year, which is a real shock to the system if you’re used to neoprene this time of August.
We kick off Friday the 28th with absolutely nothing to report. Tiny, weak 1ft SW slop with no energy (energy levels of just 7 and 13) and unfavourable wind. Saturday the 29th isn't any better, with a messy 3ft cross-shore chop in the morning. There is a clean window Saturday afternoon with a light cross-off breeze, but the wave height is only 1ft – not even worth paddling for.
Sunday the 30th through to the following week is mostly a write-off. We get a bump in swell on Monday the 31st with a 4ft SW swell and some moderate energy (182), and the wind is a clean cross-off, but the quality is still rated as poor. That about sums up the whole first week.
Now, there is one bright spot, but you have to be patient. On Sunday, September 6th in the afternoon, we finally get a pulse. The swell jumps to a solid 6ft from the SW, with a combined energy of 205 (moderate). The real winner here is the wind: light and clean from the NW, giving us a glassy cross-off. This is the best the forecast gets, and it's still 9 days out, so keep an eye on it. That 6ft is a bit much for beginners but should be fun for intermediate and above.
The rest of the second week fades fast. Monday the 7th is clean in the morning but tiny, and by Thursday the 10th we’re down to 0.3ft of useless wind swell. A long-period groundswell (12 seconds) tries to show up on Saturday the 12th of September, but it’s only 0.3ft – a tease at best.
So, the standout is that Sunday, September 6th afternoon session. It’s the only wave with any size and clean conditions. The rest of the month is a waiting game. When it's this flat, forecasts can shift, but right now, it's a quiet spell.
Rusty.
Short Range ForecastHeavy rain (total 22mm), heaviest during Sun afternoon. Very mild (max 18°C on Sun morning, min 15°C on Sun night). Winds increasing (light winds from the NNE on Sat afternoon, fresh winds from the S by Sun afternoon). | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Wed morning. Very mild (max 18°C on Mon night, min 15°C on Mon morning). Winds increasing (light winds from the SW on Tue afternoon, strong winds from the SW by Wed afternoon). | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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 6 | SW 6 | SW 5 | SW 6 | SW 6 | SW 9 | SW 8 | SW 5 | SW 8 | SW 9 | SW 8 | WSW 5 | W 4 | SW 6 | SW 6 | SW 4 | SW 6 | SW 7 | SW 6 | SW 7 | WSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 10 | 58 | 45 | 12 | 147 | 58 | 53 | 131 | 182 | 105 | 33 | 38 | 15 | 8 | 16 | 181 | 118 | 316 | 452 | 173 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | cross | cross-off | cross-off | on | on | cross-on | cross-off | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 9:23PM4.45m | 9:41AM4.17m | 9:56PM4.61m | 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 | ||||||||
Low Tide | 4:07PM0.40m | 4:34AM0.22m | 4:39PM0.34m | 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 | ||||||||
 |  |  |  |  | | | |  |  | |  | | | | | |  |  | |  | |
 | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — |
 | — | 8:16 | — | — | 8:14 | — | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:05 | — | — | 8:02 | — |
mm | 1 | — | 2 | 6 | 2 | 1 | 3 | 5 | 2 | — | — | — | — | — | 4 | 5 | 2 | 2 | — | — | — |
Temp °C | 17 | 17 | 17 | 17 | 17 | 16 | 18 | 16 | 16 | 15 | 17 | 18 | 15 | 16 | 17 | 16 | 17 | 18 | 17 | 17 | 17 |
Feels °C | 16 | 16 | 14 | 14 | 17 | 13 | 13 | 10 | 13 | 11 | 15 | 15 | 11 | 13 | 13 | 10 | 12 | 15 | 11 | 11 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | — | SW 6 | SW 6 | SW 9 | SW 8 | SW 8 | SW 8 | SW 9 | SW 8 | SW 8 | — | SW 6 | SW 6 | — | — | SW 15 | — | — | WSW 7 |
| kJ | 6 | 10 | — | 45 | 12 | 147 | 58 | 23 | 131 | 182 | 105 | 15 | — | 15 | 8 | — | — | 9 | — | — | 173 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | ESE 2 | NW 4 | — | — | — | — | — | N 4 | — | NW 4 | NNW 4 | W 16 | — | — | — | — | SW 14 |
| kJ | — | — | — | — | 1 | 5 | — | — | — | — | — | 1 | — | 10 | 2 | 5 | — | — | — | — | 8 |
Swell 3 Height (m) Direction Period (s) | — | W 11 | — | — | — | — | — | — | — | — | — | — | — | — | W 16 | — | — | — | — | — | — |
| kJ | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | 5 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 2 | — | SW 5 | ESE 3 | — | NW 4 | SSW 3 | SW 5 | — | NW 5 | NW 5 | WSW 5 | W 4 | — | — | SW 4 | SW 6 | SW 7 | SW 6 | SW 7 | WSW 7 |
| kJ | 1 | — | 58 | 1 | — | 4 | 7 | 53 | — | 35 | 22 | 33 | 38 | — | — | 16 | 181 | 118 | 316 | 452 | 114 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 307 | 317 | 307 | 47 | 125 | 0 | 201 | 312 | 3 | 253 | 3 | 126 | 333 | 317 | 280 | 298 | 298 | 262 | 252 | 373 | 385 |
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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