Surf Forecasts:
Porth Ceriad surf forecast from 20 Aug 2026:
- Most powerful swell: Wednesday 26 Aug, 7PM (local time) - 5ft (1.5m), 6s period, SW swell with 136 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 26) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s 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 26th Aug) | 5ft (1.5m) 6s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, let’s get into it. This is Rusty, looking at the next couple of weeks for Porth Ceriad.
Honestly, mate, it’s a bit of a tough stretch for Porth Ceriad. The opening of the window is a write-off. It’s going to be a long wait. The first real possibility of getting wet doesn’t show up until Thursday the 27th of August. Even then, the morning is pretty gnarly with a 7ft swell that’s too powerful and messy for a beginner-friendly spot like this. That’s nearly 8 feet, and with the period short at 6 seconds, it’s going to be a washing machine. The combined swell energy is a solid 366, so there’s plenty of power but none of the finesse.
The standout window, the only one worth getting hyped about, comes on the afternoon of Thursday the 27th of August. The wind drops to a perfect glassy calm. The swell drops back to a much more manageable 6ft, still coming from the SW. The energy is still moderate (237) but with that glassy surface, it’ll clean right up. There might be a bit of size for a beginner break, but for a competent surfer, it’s the only time the stars align. It’s not a long-lived event, though, as the wind swings offshore again for Friday morning, dropping the swell right back down.
The rest of the forecast? A whole lot of nothing. After that brief Thursday afternoon window, it’s back to small, weak, and mostly blown-out or wind-affected surf for the entire first week of September. You’re looking at a sea of 1ft to 4ft with poor wind. There’s a glimmer on Tuesday the 1st of September morning with a 4ft west swell and clean winds, but the energy is weak (64) and the period is short at 5 seconds. Not worth a special trip.
So, the bottom line is: one grand day to target if you can get out on Thursday the 27th of August in the afternoon. It’ll be glassy and clean. The rest is a waiting game. The water is a warm 67°F, which is much warmer than normal for this time of year, so at least you won’t need a thick suit when you do finally paddle out.
Stay stoked, but don’t hold your breath. This is Rusty, signing off.
Short Range ForecastModerate rain (total 11mm), heaviest on Wed night. Very mild (max 17°C on Wed night, min 13°C on Thu night). Winds decreasing (fresh winds from the N on Thu afternoon, light winds from the NNW by Fri afternoon). | Days 4-6 Weather SummarySome drizzle, heaviest during Tue afternoon. Warm (max 24°C on Mon afternoon, min 14°C on Sat night). Winds increasing (light winds from the NNE on Sun morning, strong winds from the E by Mon night). | ||||||||||||||||||||
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 | ESE 4 | ESE 3 | SW 13 | SE 3 | SSW 4 | SW 5 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 43 | 20 | 8 | 7 | 7 | 7 | 9 | 9 | 8 | 8 | 7 | 8 | 8 | 7 | 14 | 7 | 7 | 6 | 31 | 56 | 131 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | off | cross-off | off | off | cross-off | off | off | cross-off | cross-off | cross | off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on |
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 | 8:25AM1.34m | 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 | 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 | 3 | 1 | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | 1 | 11 |
Temp °C | 16 | 15 | 15 | 14 | 15 | 14 | 14 | 15 | 15 | 16 | 17 | 17 | 20 | 24 | 20 | 21 | 18 | 17 | 20 | 22 | 20 |
Feels °C | 11 | 9 | 10 | 10 | 12 | 9 | 10 | 12 | 12 | 14 | 14 | 14 | 17 | 18 | 12 | 16 | 15 | 14 | 18 | 20 | 18 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | SW 6 | WSW 6 | SW 6 | SW 13 | SW 15 | SW 15 | N 4 | — | SW 14 | SW 10 | WSW 9 | SW 9 | SW 9 | SW 13 | SW 8 | SW 9 | W 12 | — | — |
| kJ | 43 | 20 | 6 | 4 | 1 | 7 | 9 | 9 | 2 | — | 7 | 4 | 8 | 3 | 3 | 7 | 3 | 3 | 3 | — | — |
Swell 2 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 6 | W 6 | SW 12 | SW 15 | SW 14 | W 9 | — | SW 14 | SW 13 | SW 13 | SW 8 | SW 13 | SW 7 | W 13 | — | W 12 |
| kJ | 8 | 8 | 8 | 7 | 7 | 1 | 1 | 6 | 8 | 8 | 2 | — | 8 | 7 | 7 | 3 | 7 | 2 | 3 | — | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | W 14 | W 14 | W 16 | W 16 | W 10 | — | SW 12 | W 9 | — | SW 14 | — | — | — | W 8 | — | — | — | — | — |
| kJ | — | — | 4 | 4 | 5 | 5 | 2 | — | 6 | 2 | — | 8 | — | — | — | 1 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 4 | NNW 4 | NNW 5 | NNW 5 | — | — | NNW 4 | — | ESE 3 | ESE 3 | ESE 4 | ESE 3 | ENE 3 | SE 3 | SSW 4 | SW 5 | SW 7 |
| kJ | 35 | 70 | 42 | 32 | 18 | 19 | 9 | 9 | — | — | 1 | — | 2 | 1 | 14 | 7 | 3 | 6 | 31 | 56 | 131 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 785 | 120 | 460 | 139 | 138 | 308 | 141 | 185 | 307 | 133 | 133 | 306 | 113 | 298 | 301 | 307 | 327 | 303 | 280 | 312 | 296 |
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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