Surf Forecasts:
Porth Ceriad surf forecast from 11 Aug 2026:
- Most powerful swell: Friday 14 Aug, 1AM (local time) - 2.5ft (0.8m), 5s period, WSW swell with 31 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 0.8m 5s and forecast to arrive on Friday (Aug 14) at 1AM. Winds are predicted to be 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 Friday (Aug 14) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Fri 14th Aug) | 2.5ft (0.8m) 5s |
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. Gotta be straight with you – it’s a pretty bleak picture for a while. The first solid surfable waves are a long way off, so patience is the name of the game.
We're looking at a run of very small, weak swell for the first week and a half. Through the end of this week and most of next, the wave heights are barely a ripple, mostly 0.3ft to 2ft. The combined wave energy is almost non-existent (values as low as 2 to 3, only nudging up to the low 30s by the 19th). The wind is often clean or offshore, which is nice, but with no swell to work with, you’re just looking at a flat, glassy sea. It's not worth paddling out for.
We finally see a pulse of energy arrive around Sunday the 23rd of August. The swell bumps up to 4ft from the SW, with period around 8 seconds, and the energy jumps to 244 (moderate). The wind is a cross-onshore at 15 mph, so it won't be clean, but it's the first real sign of life.
The standout window, and the only time I'd really get excited, is Monday the 24th and Tuesday the 25th. Monday morning is the pick of the entire forecast. A strong SW groundswell pushes through at 8ft, period 9 seconds. The combined energy hits a very strong 1105. The wind is a firm offshore from the WNW at 34 mph, which will groom those waves beautifully. That's a proper wave for experienced surfers only – 8ft plus is expert territory. The water temp is notably warm, sitting at 66°F, which is much warmer than normal for this time of year.
Tuesday the 25th still has some size, with a SW swell around 6ft, but the wind swings cross-shore and gets messy, so it won't be as clean as Monday.
For beginners, the swell on the 23rd at 4ft might be manageable, but the cross-onshore wind will make it a bit of a battle. The big Monday swell is definitely not for the learning crew.
So, to sum it up: you've got a long flat spell until the 23rd. The only true standout is Monday the 24th of August for expert surfers looking for a powerful, clean session at Porth Ceriad. After that, the swell drops back down quickly.
Stay patient, and keep an eye on the forecasts. It’s a sleepy start, but that Monday looks like it'll wake the place up.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Wed afternoon, min 17°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Sun afternoon. Very mild (max 18°C on Fri night, min 14°C on Sun afternoon). Wind will be generally light. | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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 | W 11 | WSW 10 | WSW 10 | SW 9 | SW 8 | SW 8 | WSW 5 | SW 5 | SW 5 | SW 6 | WSW 7 | WSW 7 | SW 7 | WSW 4 | WSW 4 | SW 3 | SW 4 | SW 5 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2 | 2 | 3 | 10 | 9 | 21 | 18 | 14 | 31 | 11 | 7 | 10 | 5 | 5 | 2 | 2 | 2 | 2 | 11 | 7 | 9 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross-on | cross-off | on | cross-on | cross-on | on | cross-off | off | cross-off | cross-off | cross-off | glassy | on | on | cross-off | cross-off | cross-off | cross-off |
High Tide | 7:59PM4.30m | 8:26AM4.13m | 8:47PM4.64m | 9:12AM4.31m | 9:31PM4.85m | 9:55AM4.39m | 10:13PM4.92m | 10:36AM4.37m | 10:55PM4.81m | 11:16AM4.24m | 11:35PM4.56m | 11:55AM4.03m | 00:15AM4.20m | ||||||||
Low Tide | 2:57PM0.55m | 3:28AM0.17m | 3:43PM0.31m | 4:13AM-0.07m | 4:24PM0.16m | 4:55AM-0.16m | 5:03PM0.12m | 5:34AM-0.10m | 5:40PM0.20m | 6:11AM0.09m | 6:16PM0.37m | 6:46AM0.37m | 6:49PM0.61m | ||||||||
 | |  |  | | | | | |  | |  | | | |  |  |  | | | | |
 | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:56 | — | — | 5:58 | — | — | 6:00 | — | — | 6:01 | — | — |
 | — | 8:52 | — | — | 8:51 | — | — | 8:49 | — | — | 8:46 | — | — | 8:45 | — | — | 8:43 | — | — | 8:40 | — |
mm | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | 2 | 6 | — | — | — | — |
Temp °C | 21 | 21 | 21 | 23 | 25 | 24 | 21 | 21 | 19 | 16 | 17 | 18 | 16 | 18 | 17 | 16 | 14 | 15 | 16 | 18 | 16 |
Feels °C | 20 | 21 | 21 | 21 | 23 | 22 | 22 | 21 | 19 | 13 | 13 | 15 | 12 | 15 | 15 | 14 | 14 | 15 | 15 | 15 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | — | WSW 10 | WSW 10 | SW 9 | SW 8 | SW 8 | SW 9 | SW 5 | SW 5 | SW 6 | WSW 7 | WSW 7 | — | WSW 4 | WSW 4 | W 7 | SW 4 | SW 5 | SW 6 |
| kJ | 2 | 2 | — | 10 | 9 | 21 | 18 | 14 | 3 | 11 | 7 | 10 | 5 | 5 | — | 2 | 2 | 1 | 11 | 7 | 9 |
Swell 2 Height (m) Direction Period (s) | — | — | SW 6 | SW 6 | SW 6 | — | — | — | SW 9 | SW 8 | SW 8 | W 8 | — | — | SW 7 | W 7 | W 7 | W 7 | W 7 | — | N 3 |
| kJ | — | — | 1 | 1 | 1 | — | — | — | 3 | 3 | 3 | 1 | — | — | 2 | 1 | 1 | 1 | 1 | — | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | W 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SE 2 | — | — | SSE 2 | — | — | — | — | WSW 5 | NW 4 | NW 4 | NW 3 | NW 4 | NW 4 | — | — | — | SW 3 | — | NW 2 | — |
| kJ | 1 | — | — | 1 | — | — | — | — | 31 | 31 | 15 | 2 | 17 | 11 | — | — | — | 2 | — | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 319 | 339 | 113 | 113 | 130 | 125 | 126 | 303 | 138 | 138 | 114 | 138 | 125 | 306 | 141 | 298 | 301 | 308 | 113 | 125 | 113 |
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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