Surf Forecasts:
Porth Ceriad surf forecast from 18 Aug 2026:
- Most powerful swell: Wednesday 19 Aug, 7PM (local time) - 5ft (1.5m), 6s period, SW swell with 143 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 1.5m 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 1.4m 6s period and expected on Thursday (Aug 20) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 19th Aug) | 5ft (1.5m) 6s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, listen up, let’s get real about the next couple of weeks. It ain't pretty.
To be honest, there's a long dry spell heading our way. The first few days are just poor. Tuesday the 18th has a weak 3ft of WSW swell, but it’s chopped up and weak. Wednesday the 19th is a bit bigger, around 4ft, but it's short-period junk with fresh winds ruining it. The water temp is normal for this time of year, but that's where the good news ends.
Then we hit the dead zone. From Thursday the 21st through the weekend and into Monday the 24th, the swell just vanishes to a measly 0.3ft. It’s clean and glassy at times, but you won’t even get your feet wet. There’s a long-period groundswell pushing through, but with that kind of size, it means nothing. A proper flat spell.
A weak pulse tries to show up on Tuesday the 26th, with the energy picking up, but we're still only looking at 3ft of cross-shore chop. The rest of the week stays in the doldrums, just nothing to get excited about.
Now, the end of the window. Sunday the 30th starts to see some size, and by Monday the 31st, we're looking at 7ft of swell. There’s a ton of energy in the water, but the wind is onshore and messy. It’s going to be a big, blown-out mess. This is only for the experts anyway, as it’s well over 8ft. This might be better for kitesurfing than surfing.
So, there’s no standout here. The only marginal call is on the 2nd of September when things start to settle, but it's still short-period and the winds are light and cross-shore. With this much flatness and very few consistent days, this seems like a typical bad run for the area. Don't get your hopes up, keep the wax in the cupboard and see if the forecasts change.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Mon night. Very mild (max 18°C on Mon night, min 14°C on Thu afternoon). Winds increasing (light winds from the SW on Tue afternoon, fresh winds from the N by Thu afternoon). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Thu night. Very mild (max 16°C on Fri afternoon, min 13°C on Fri night). Winds increasing (calm on Fri morning, fresh winds from the NNW by Sat afternoon). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 6 | SW 6 | WSW 4 | WSW 4 | SW 5 | WSW 6 | SW 6 | SW 6 | SW 6 | NW 4 | NW 4 | W 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 85 | 29 | 16 | 43 | 73 | 106 | 43 | 20 | 8 | 7 | 7 | 7 | 9 | 9 | 8 | 8 | 7 | 8 | 8 | 7 | 12 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | cross-on | cross | cross-off | off | off | glassy | off | off | off | cross-off | off | off | cross-off | glassy | on | cross-on | cross-on |
High Tide | 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 | 6:45AM2.97m | 7:07PM3.26m | ||||||||
Low Tide | 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 | 1:44PM1.32m | 2:15AM1.10m | |||||||
 | |  |  |  | | | | |  | | | | |  | | | | | |  | |
 | 6:03 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — |
 | — | 8:38 | — | — | 8:37 | — | — | 8:34 | — | — | 8:31 | — | — | 8:30 | — | — | 8:28 | — | — | 8:25 | — |
mm | — | — | 3 | — | 1 | 6 | 3 | — | 1 | 2 | 1 | 4 | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 18 | 15 | 16 | 17 | 17 | 15 | 15 | 14 | 15 | 16 | 15 | 14 | 15 | 15 | 14 | 16 | 15 | 15 | 16 | 16 |
Feels °C | 12 | 15 | 12 | 11 | 12 | 14 | 10 | 10 | 11 | 14 | 14 | 11 | 11 | 10 | 11 | 9 | 13 | 12 | 12 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | W 16 | NW 4 | NW 4 | W 16 | NW 4 | SW 16 | SW 6 | SW 6 | SW 6 | NW 4 | NW 4 | SW 5 | NNW 4 | SW 15 | SW 15 | SW 14 | SW 14 | NNW 4 | SW 14 | SW 14 | SW 13 |
| kJ | 5 | 7 | 1 | 5 | 1 | 10 | 43 | 20 | 6 | 6 | 4 | 1 | 1 | 9 | 8 | 8 | 7 | 1 | 8 | 7 | 7 |
Swell 2 Height (m) Direction Period (s) | — | W 17 | W 17 | — | — | — | SW 15 | SW 14 | SW 14 | WSW 6 | WSW 6 | SW 13 | SW 15 | W 12 | W 12 | W 9 | W 9 | SW 14 | — | W 8 | — |
| kJ | — | 5 | 6 | — | — | — | 8 | 8 | 8 | 3 | 3 | 7 | 9 | 3 | 3 | 2 | 2 | 8 | — | 1 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | W 14 | SW 13 | SW 13 | W 16 | — | W 10 | W 12 | — | — | W 9 | — | — | W 8 |
| kJ | — | — | — | — | — | — | — | — | 4 | 7 | 7 | 5 | — | 2 | 3 | — | — | 2 | — | — | 1 |
Wind waves Height (m) Direction Period (s) | WSW 6 | SW 6 | WSW 4 | WSW 4 | SW 5 | WSW 6 | NW 4 | NNW 6 | NNW 4 | — | NW 4 | N 3 | — | NW 4 | N 4 | NNW 4 | NW 4 | — | SSW 2 | SW 3 | SW 4 |
| kJ | 85 | 29 | 16 | 43 | 73 | 106 | 18 | 110 | 6 | — | 6 | 3 | — | 16 | 6 | 13 | 10 | — | 1 | 2 | 12 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 3 | 460 | 139 | 298 | 298 | 3 | 126 | 189 | 138 | 125 | 189 | 213 | 133 | 189 | 303 | 303 | 317 | 189 | 303 | 298 | 301 |
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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