Surf Forecasts:
Porth Ceriad surf forecast from 20 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 4PM (local time) - 4.5ft (1.3m), 7s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 26 Aug, 4PM (local time) - 4.5ft (1.3m), 7s period, SW swell with 167 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 4PM (local time) - 4.5ft (1.3m), 7s 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 Wednesday (Aug 26) at 4PM. The primary swell is predicted to be 1.3m and 7s period with a secondary swell of 0.4m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Porth Ceriad in the next 16 days are 1.3m 7s and forecast to arrive on Wednesday (Aug 26) at 4PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Thursday (Aug 20) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Wed 26th Aug) | 4.5ft (1.3m) 7s |
| Best Surf | 4PM (Wed 26th Aug) | 4.5ft (1.3m) 7s |
| Most Powerful | 4PM (Wed 26th Aug) | 4.5ft (1.3m) 7s |
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 the cards for Porth Ceriad over the next couple of weeks.
To be honest, it's a bit of a slow burn. For the first week and a bit, you're not going to find much to get excited about. The swell is tiny, mostly around 0.3ft to 2ft, and whilst we get some clean, offshore mornings, there's just no energy behind it. The combined energy values barely tickle the 50s (51), and most days are well below that. Thursday the 26th of August afternoon shows a slight pulse to 4ft from the SW (period 7 seconds), and the energy kicks up to 182, but the comment says it's "surfable waves but very ordinary conditions" – it just doesn't have the quality we're after.
There's a real gap here. We're looking at a full stretch from the start of the period right through to the very end of August and into the beginning of September with nothing recommended. It's not until Thursday the 3rd of September that something finally catches the eye.
That Thursday the 3rd of September afternoon is your standout. The swell jumps to 6ft from the NW, and with a period of 6 seconds the energy ramps up to 282. The wind is a light WNW breeze, coming cross-offshore which will keep the face clean. The guidance says this spot is exposed to a SW swell, but the NW direction for this one is actually pretty decent – it'll wrap in and produce some fun waves. The water temp is a notable 67°F, which is a whopping 6° warmer than normal for this time of year, so you can get away with a spring suit. This is a beginner-friendly spot that's fairly consistent, but keep in mind crowds are often here. For that Thursday afternoon, it's your best bet, but remember it's a long-range call so keep your hopes tempered.
Before that, Wednesday the 2nd of September morning has a clean 4ft from the WSW with offshore winds (15 mph) but the energy is only 90, so it's just okay, nothing special. The real action is that Thursday afternoon.
Over the weekend of the 29th and 30th of August, the mornings are glassy with small 1ft to 4ft swell, but the quality is still very ordinary. There's just no consistency in the quality.
So, bottom line: you're looking at a whole lot of flat and poor conditions until the 3rd of September. Keep an eye on that Thursday afternoon, but otherwise, it's a waiting game.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Thu morning. Very mild (max 16°C on Thu morning, min 13°C on Thu night). Winds decreasing (fresh winds from the N on Thu afternoon, light winds from the NE by Fri morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Mon afternoon, min 14°C on Sun morning). Winds increasing (calm on Mon afternoon, fresh winds from the ESE by Tue afternoon). | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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 6 | W 14 | W 16 | W 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | WSW 9 | SW 13 | SW 13 | ESE 4 | SE 4 | SW 13 | SW 5 | SW 7 | SW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 43 | 19 | 10 | 7 | 7 | 7 | 9 | 9 | 8 | 8 | 7 | 8 | 8 | 7 | 7 | 12 | 7 | 7 | 23 | 167 | 84 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | off | off | off | off | cross-off | off | cross-off | off | cross-off | cross | glassy | cross | cross | cross | cross | cross-on | glassy | glassy |
High Tide | 2:05PM3.11m | 2:38AM2.96m | 3:15PM2.85m | 4:06AM2.73m | 4:55PM2.79m | 5:42AM2.76m | 6:14PM2.97m | 6:45AM2.97m | 7:07PM3.26m | 7:28AM3.22m | 7:46PM3.59m | 8:04AM3.49m | 8:20PM3.91m | ||||||||
Low Tide | 8:46PM1.43m | 9:17AM1.59m | 10:04PM1.63m | 10:53AM1.71m | 00:05AM1.62m | 12:43PM1.59m | 1:27AM1.39m | 1:44PM1.32m | 2:15AM1.10m | 2:25PM1.03m | 2:53AM0.81m | 3:01PM0.77m | 3:27AM0.54m | ||||||||
 |  |  | | |  |  | | | | | |  | |  | | | | |  | | |
 | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — |
 | — | 8:34 | — | — | 8:31 | — | — | 8:30 | — | — | 8:28 | — | — | 8:25 | — | — | 8:22 | — | — | 8:21 | — |
mm | 4 | — | 1 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 15 |
Temp °C | 16 | 15 | 15 | 15 | 16 | 15 | 14 | 15 | 15 | 16 | 17 | 17 | 20 | 22 | 21 | 18 | 21 | 19 | 19 | 20 | 16 |
Feels °C | 10 | 9 | 10 | 14 | 13 | 11 | 11 | 11 | 11 | 14 | 14 | 14 | 18 | 20 | 15 | 15 | 15 | 14 | 18 | 20 | 16 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | SW 6 | WSW 6 | SW 6 | SW 13 | SW 15 | SW 15 | SW 15 | N 4 | SW 14 | SW 10 | WSW 9 | SW 9 | SW 13 | SW 13 | SE 4 | SW 6 | SW 5 | SW 8 | SW 8 |
| kJ | 43 | 19 | 10 | 3 | 1 | 7 | 9 | 9 | 8 | 1 | 7 | 4 | 8 | 3 | 7 | 7 | 6 | 1 | 23 | 15 | 84 |
Swell 2 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 6 | W 6 | SW 12 | SW 12 | SW 14 | W 9 | SW 14 | SW 14 | SW 13 | SW 9 | SW 8 | SW 8 | SW 8 | W 12 | — | — |
| kJ | 8 | 8 | 8 | 7 | 7 | 1 | 1 | 6 | 6 | 8 | 2 | 8 | 8 | 7 | 3 | 3 | 3 | 2 | 3 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | W 14 | W 14 | W 16 | W 16 | W 10 | — | W 12 | W 9 | — | — | — | — | — | — | SW 13 | SW 13 | — | — | — |
| kJ | — | — | 4 | 4 | 5 | 5 | 2 | — | 3 | 2 | — | — | — | — | — | — | 7 | 7 | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 4 | NNW 5 | NNW 4 | NW 5 | NW 5 | NNW 4 | NNW 5 | NNW 4 | NNW 4 | — | NNW 4 | — | ESE 3 | — | ESE 3 | ESE 4 | — | SSE 3 | SE 4 | SW 7 | — |
| kJ | 21 | 86 | 26 | 23 | 17 | 15 | 17 | 14 | 4 | — | 2 | — | 1 | — | 4 | 12 | — | 3 | 12 | 167 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 319 | 460 | 138 | 138 | 277 | 141 | 133 | 248 | 133 | 133 | 284 | 113 | 298 | 301 | 303 | 284 | 280 | 213 | 132 | 0 | 0 |
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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