Surf Forecasts:
Porth Ceriad surf forecast from 15 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 10AM (local time) - 3ft (0.9m), 5s period, WSW swell with cross-offshore winds.
- Most powerful swell: Thursday 20 Aug, 4AM (local time) - 4ft (1.2m), 5s period, WSW swell with 75 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 10AM (local time) - 3ft (0.9m), 5s period with WSW swell.
Best Forecast Surf Conditions for Porth Ceriad this week:
The surf forecast for Porth Ceriad over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 10AM. The primary swell is predicted to be 0.9m and 5s period with a secondary swell of 0.1m and 16s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Porth Ceriad in the next 16 days are 1.2m 5s and forecast to arrive on Thursday (Aug 20) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Friday (Aug 21) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Tue 18th Aug) | 3ft (0.9m) 5s |
| Best Surf | 10AM (Tue 18th Aug) | 3ft (0.9m) 5s |
| Most Powerful | 4AM (Thu 20th Aug) | 4ft (1.2m) 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 we've got for Porth Ceriad over the next couple of weeks. I'll be honest, right out the gate: this stretch looks pretty bleak for paddle surfing. The whole 16-day window is a bit of a sad tale, so don't go getting your hopes up.
We start off well into the forecast, and right from Saturday the 15th, it's a tough scene. The swell is a tiny 0.7ft from the WSW with a short period of 7 seconds, and the combined energy is really weak, just 7. That's barely a ripple. The water temperature is a very unusual 67°, which is much warmer than normal for this time of year. The wind is offshore from the North at 16 mph, which would be great if there was any swell, but there isn't.
The whole first week is a write-off. We see a few days with slightly more energy, like Tuesday the 18th with 3ft swell (combined energy 51), but it's still a poor quality wave. We get a bit of a bump on Thursday the 20th with 3ft swell from the West and a 5-second period, but the combined energy is only 60, and the conditions are described as "very ordinary." The wind is cross-offshore in the morning, but it's just not enough to make it worthwhile.
After that, the swell drops right off again. From the 21st through the 27th of August, we're looking at 0.3ft to 1ft waves. The periods get really long, hitting 15 seconds on the 22nd and 23rd, but with that tiny height, it's just a fat, rolling lump. The wind is often offshore or cross-offshore, but you can't surf a 0.3ft wave no matter how clean it is. The combined energy values are all in the single digits or low teens, confirming just how weak it is.
There is a very slight uptick right at the end, on the 29th and 30th of August. On Saturday the 29th morning, we get 0.7ft at 8 seconds from the WSW with glassy conditions. Sunday the 30th morning is the same story: 0.7ft, glassy. But a 0.7ft wave is a knee-high dribbler at best. It's clean, but you'd be doing more floating than surfing.
So, to lay it out plain: there are no standout days here. No bigger swells to get excited about. The entire 16-day outlook is a series of poor or very ordinary conditions with tiny surf. The best I can honestly say is that the final weekend, August 29th and 30th, has the cleanest conditions, but the swell is simply too small for any real riding. If you're dead set on getting wet, a longboard and a whole lot of patience might get you a few tiny glides on the morning glass, but I wouldn't pack a bag for it. It’s a true gap in swell for the area.
Stay tuned, forecasts change.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Mon night. Very mild (max 19°C on Mon night, min 15°C on Sat morning). Winds decreasing (fresh winds from the NNW on Sat afternoon, calm by Sun morning). | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Tue night. Very mild (max 18°C on Tue morning, min 14°C on Tue night). Winds decreasing (fresh winds from the W on Wed morning, calm by Thu afternoon). | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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 7 | WSW 7 | SW 7 | SW 7 | W 7 | SW 4 | WSW 5 | SW 5 | SW 4 | WSW 5 | SW 6 | W 3 | W 4 | SW 5 | WSW 5 | W 5 | WSW 6 | SW 6 | SW 6 | W 16 | SW 13 |
Wave Graph | |||||||||||||||||||||
5 | 5 | 2 | 2 | 1 | 3 | 10 | 6 | 12 | 46 | 25 | 11 | 30 | 23 | 44 | 52 | 23 | 9 | 9 | 7 | 7 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | glassy | cross-on | on | cross-off | cross-on | cross-on | cross-off | cross-off | cross-off | cross | cross-on | cross | cross-off | cross-on | off | off | cross-off | cross-off |
High Tide | 10:36AM4.37m | 10:55PM4.81m | 11:16AM4.24m | 11:35PM4.56m | 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 | ||||||||
Low Tide | 5:40PM0.20m | 6:11AM0.09m | 6:16PM0.37m | 6:46AM0.37m | 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 | ||||||||
5:58 | — | — | 6:00 | — | — | 6:01 | — | — | 6:03 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | |
— | 8:45 | — | — | 8:43 | — | — | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:34 | — | — | 8:31 | — | |
mm | — | — | — | — | — | — | — | — | 2 | — | — | 3 | 1 | — | 4 | 1 | — | — | — | — | — |
Temp °C | 15 | 16 | 16 | 15 | 15 | 17 | 15 | 16 | 19 | 18 | 18 | 15 | 15 | 17 | 17 | 15 | 16 | 15 | 15 | 15 | 15 |
Feels °C | 11 | 11 | 12 | 15 | 13 | 18 | 13 | 14 | 17 | 17 | 17 | 12 | 9 | 11 | 13 | 13 | 14 | 13 | 12 | 11 | 13 |
Swell 1 Height (m) Direction Period (s) | WSW 7 | WSW 7 | SW 7 | SW 7 | SW 5 | SW 4 | WSW 5 | SW 5 | — | W 16 | SW 6 | W 17 | — | NW 4 | SW 16 | SW 15 | WSW 6 | SW 6 | SW 6 | WSW 6 | NW 4 |
5 | 5 | 2 | 2 | 1 | 3 | 10 | 6 | — | 5 | 25 | 6 | — | 6 | 10 | 8 | 23 | 9 | 9 | 3 | 2 | |
Swell 2 Height (m) Direction Period (s) | W 10 | — | SW 7 | — | W 7 | W 7 | — | NW 4 | — | — | W 17 | — | — | W 15 | — | — | SW 14 | SW 14 | SW 13 | SW 13 | SW 6 |
2 | — | 2 | — | 1 | 1 | — | 2 | — | — | 5 | — | — | 5 | — | — | 8 | 8 | 7 | 7 | 1 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 7 | — | — | — | — | — | — | — | — | — | — | W 11 | W 10 | — | W 16 | SW 13 |
— | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | 2 | 2 | — | 5 | 7 | |
Wind waves Height (m) Direction Period (s) | N 3 | NNW 4 | N 3 | — | — | — | NW 4 | — | SW 4 | WSW 5 | NW 4 | W 3 | W 4 | SW 5 | WSW 5 | W 5 | NW 4 | NNW 4 | NW 5 | NW 5 | — |
6 | 18 | 2 | — | — | — | 6 | — | 12 | 46 | 4 | 11 | 30 | 23 | 44 | 52 | 7 | 24 | 35 | 17 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 322 | 738 | 303 | 298 | 312 | 301 | 303 | 312 | 385 | 0 | 557 | 298 | 303 | 303 | 290 | 0 | 303 | 77 | 133 | 140 | 133 |
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.











