Surf Forecasts:
Porth Ceriad surf forecast from 17 Aug 2026:
- Most powerful swell: Wednesday 19 Aug, 7PM (local time) - 5ft (1.6m), 6s period, SW swell with 196 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 1.6m 6s and forecast to arrive on Wednesday (Aug 19) at 7PM. 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 4s period and expected on Thursday (Aug 20) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 19th Aug) | 5ft (1.6m) 6s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Well, folks, it’s Rusty here, and I gotta be straight with you – this is a tough one. Looking at the whole 16-day window, the honest truth is there’s not a single good surf option on offer for Porth Ceriad. The forecast is a long, dusty stretch of flat, weak, and messy conditions. The first few days are a write-off with tiny swell and onshore or cross-shore winds, and that pattern just never lets up.
From Monday 17 August right through the end of the month, the swell barely gets a pulse. We see a small bump on Wednesday 19 August with a 4ft WSW swell, but the wind is a fresh 22 mph cross-onshore, making it lumpy and ugly – not worth paddling out for. The energy readings are mostly in the double digits, like 13 (weak) on the 17th, or 90 and 184 on the 19th, which is moderate but completely blown out. There’s a brief moment Thursday 20 August with clean offshore winds, but the swell is only 2ft and 1ft – barely a ripple. The whole first week is a no-go.
The second week doesn’t get any better. The swell stays tiny, with heights of 0.3ft to 2ft, and the longer-period stuff (13 to 15 seconds) shows up 21 August onward, but it’s so small it’s irrelevant. The water temperature is 67°F, which is a whopping 6°F warmer than normal – that’s very unusual for this time of year, and it’s already notable. But the waves? Nada. There’s a little bump on 30 August with a 6ft SW swell, but the wind is cross-shore and the energy is 224 (moderate), so it’s messy and not clean.
All in all, this is a blank run. Porth Ceriad is a consistent spot, but it’s going through a real dry spell. The only thing I can say is that it tends not to stay poor for long, and forecasts can change, so keep your fingers crossed. For now, leave the board at home.
Rusty
Short Range ForecastLight rain (total 9mm), mostly falling on Mon night. Very mild (max 19°C on Tue afternoon, min 14°C on Tue night). Winds increasing (light winds from the NW on Mon morning, fresh winds from the W by Tue night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Thu morning, min 13°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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 5 | SW 5 | SW 4 | WSW 6 | WSW 6 | WSW 4 | WSW 5 | SW 5 | WSW 6 | SW 6 | SW 6 | SW 6 | SW 13 | W 16 | SW 13 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 15 | 7 | 29 | 47 | 23 | 46 | 48 | 98 | 131 | 40 | 19 | 9 | 7 | 7 | 7 | 9 | 9 | 8 | 8 | 7 | 8 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-on | cross-off | cross-on | cross | cross | cross-on | cross | cross-off | off | off | off | cross-off | cross-off | off | off | off | off | off | cross-off |
High Tide | 11:55AM4.03m | 00:15AM4.20m | 12:35PM3.75m | 00:56AM3.78m | 1:17PM3.43m | 1:41AM3.34m | 2:05PM3.11m | 2:38AM2.96m | 3:15PM2.85m | 4:06AM2.73m | 4:55PM2.79m | 5:42AM2.76m | 6:14PM2.97m | ||||||||
Low Tide | 6:49PM0.61m | 7:18AM0.70m | 7:22PM0.88m | 7:50AM1.04m | 7:58PM1.17m | 8:25AM1.34m | 8:46PM1.43m | 9:17AM1.59m | 10:04PM1.63m | 10:53AM1.71m | 00:05AM1.62m | 12:43PM1.59m | 1:27AM1.39m | ||||||||
 |  |  | | |  | |  | | |  |  | | |  | | | | | | | |
 | 6:01 | — | — | 6:03 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — |
 | — | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:34 | — | — | 8:31 | — | — | 8:30 | — | — | 8:28 | — |
mm | — | — | 2 | — | — | 1 | — | 3 | 3 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 17 | 18 | 16 | 19 | 16 | 16 | 17 | 17 | 16 | 16 | 15 | 15 | 16 | 15 | 15 | 16 | 14 | 16 | 17 | 15 |
Feels °C | 15 | 15 | 15 | 13 | 15 | 10 | 10 | 12 | 12 | 13 | 11 | 12 | 11 | 14 | 12 | 11 | 10 | 9 | 12 | 12 | 10 |
Swell 1 Height (m) Direction Period (s) | WSW 5 | SW 5 | — | WSW 6 | NW 4 | — | W 16 | — | — | SW 6 | SW 6 | SW 6 | NNW 4 | WSW 6 | NNW 4 | NNW 4 | SW 15 | SW 15 | NNW 5 | SW 14 | NNW 4 |
| kJ | 15 | 7 | — | 47 | 6 | — | 5 | — | — | 40 | 19 | 9 | 7 | 3 | 1 | 4 | 9 | 8 | 14 | 7 | 3 |
Swell 2 Height (m) Direction Period (s) | — | NW 3 | — | W 16 | W 17 | — | — | — | — | SW 15 | SW 14 | SW 14 | WSW 6 | SW 13 | SW 5 | SW 15 | — | W 12 | SW 14 | W 9 | SW 14 |
| kJ | — | 2 | — | 5 | 5 | — | — | — | — | 8 | 8 | 8 | 3 | 7 | 1 | 9 | — | 3 | 8 | 2 | 8 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | W 14 | SW 13 | W 16 | SW 13 | W 6 | W 12 | W 12 | W 9 | — | W 10 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 4 | 7 | 5 | 7 | 1 | 3 | 3 | 2 | — | 2 |
Wind waves Height (m) Direction Period (s) | — | — | SW 4 | NW 4 | WSW 6 | WSW 4 | WSW 5 | SW 5 | WSW 6 | NW 4 | NNW 4 | NNW 3 | — | NW 4 | — | ESE 3 | NNW 4 | NNW 3 | — | NNW 4 | ENE 3 |
| kJ | — | — | 29 | 5 | 23 | 46 | 48 | 98 | 131 | 29 | 26 | 4 | — | 8 | — | 2 | 2 | 4 | — | 13 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 303 | 336 | 550 | 3 | 460 | 303 | 303 | 289 | 342 | 126 | 200 | 125 | 125 | 306 | 113 | 113 | 186 | 303 | 303 | 304 | 213 |
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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