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 folks, Rusty here. Let’s have a look at what Porth Ceriad has in store for us over the next couple of weeks.
To be straight with you, it’s a lean period. For the first week and a half, we’re looking at a whole lot of nothing. From Monday 17th right through to the end of the month, the surf is tiny or blown out. The water is sitting at a very unusual 67° – that’s 6° warmer than average for this time of year, which is a real oddity for Porth Ceriad. The swell energy is mostly below 100 (weak), and even when a few pulses show up, the wind is junk – cross-onshore or onshore and messy. There are a couple of clean windows with offshore winds on Thursday 20th afternoon and Friday 21st morning, but the swell is barely a ripple at 2 ft with short period, so you’re just floating around.
The only real glimmer in the whole 16-day run comes right at the tail end. On Saturday 29th August morning, we finally get something to talk about. The swell bumps up to 7 ft from the WSW, with a period of 7 seconds, and combined wave energy hits 332 (moderate energy). The wind is cross-offshore from the WNW at 12 mph, keeping the surf clean. This is the standout of the period, but at 7 ft it’s getting a bit too much for beginners, and the short period means it’ll be a bit lumpy. It’s the only day worth checking.
After that, it gets ugly again. Sunday 30th has a near-gale blowing, and Monday 31st brings a big cross-onshore swell at 8 ft with strong wind – messy and unrideable for most. That’s not surf, that’s a washing machine.
So, if you’ve got to pick a day, make it Saturday 29th morning at Porth Ceriad. It’s not perfect, but it’s the only game in town. Keep an eye on the forecast for that one.
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 | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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