Surf Forecasts:
Porth Ceriad surf forecast from 15 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 1AM (local time) - 4.5ft (1.3m), 5s period, WSW swell with 86 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 1.3m 5s and forecast to arrive on Thursday (Aug 20) at 1AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Thursday (Aug 20) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Thu 20th Aug) | 4.5ft (1.3m) 5s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright folks, Rusty here again, giving you the same picture but in feet and degrees Fahrenheit.
It’s going to be a quiet one at Porth Ceriad. We’re looking at a long stretch of almost nothing. The first real chance to even think about a paddle won’t come until the morning of Monday the 18th of August, and even then it’s not going to get the heart racing. The whole forecast is a test of patience, with a proper gap of nothing doing before that.
The water temp is sitting at 67°F, which is a whopping 6°F warmer than usual for this time of year. That’s very unusual, mate, proper tropical-feeling water for these parts.
Let’s run through it. Saturday the 15th has a tiny 0.7ft swell from the WSW with a weak 7-second period, and a fresh 19 mph cross-off wind from the NNW. The combined energy is a measly 5. It’s clean, but there’s nothing to ride. Sunday the 16th is glassy in the morning, but the swell drops to 0.3ft. It’s a complete flat spell.
Monday the 17th of August doesn’t offer much more. A 1ft swell from the WSW with a 5-second period, and the combined energy is only 9. The wind is a gentle cross-off, so it’s clean, but it’s just not enough to bother with.
The best of a bad bunch, and I’m using that term loosely, looks like the morning of Tuesday the 19th of August. You’ll see the swell bump up to 3ft from the west, but with a short 4-second period. The combined energy climbs to 42. It’s a moderate cross-shore breeze from the west at 16 mph, so it’s going to be chop city. The afternoon is similar, with 4ft from the WSW and a 5-second period, energy at 50, but still a messy cross-shore. This is a beginner-friendly spot, but those conditions won’t be pretty for anyone.
The rest of the week into the next just fades away. From Thursday the 21st onwards, we’re back to tiny 0.3ft leftovers. The period on that day gets long – 13 seconds – but with no height, it’s meaninglessness. The wind does turn offshore on the 21st, which is a nice look, but there’s no wave to blow out. That pattern of tiny swell and long, clean periods continues right through the end of the month.
Honestly, there’s no standout here. Nothing to get excited about. It’s a flat spell for Porth Ceriad. The best you can hope for is a small, choppy session on the 19th if you’re desperate. Otherwise, leave the boards in the van and enjoy the sunshine.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Mon night. Very mild (max 18°C on Mon night, min 14°C on Sat night). Winds decreasing (fresh winds from the NNW on Sat afternoon, calm by Sun morning). | Days 5-7 Weather SummarySome drizzle, heaviest during Wed night. Very mild (max 17°C on Tue afternoon, min 13°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sat 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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 | SW 7 | SW 7 | W 7 | W 7 | WSW 5 | SW 5 | SW 4 | WSW 6 | SW 6 | W 6 | W 4 | WSW 5 | WSW 5 | SW 6 | SW 6 | SW 5 | SW 13 | W 16 | SW 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 5 | 2 | 2 | 1 | 1 | 7 | 6 | 29 | 41 | 27 | 23 | 37 | 50 | 86 | 35 | 16 | 8 | 7 | 7 | 7 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | glassy | cross-on | on | cross-off | cross-off | cross-on | cross-off | cross | cross-off | cross | cross | cross | cross-off | cross-off | off | off | off | cross |
High Tide | 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 | |||||||
 |  |  |  |  | | |  | | | | | |  | | | | | | | |
 | — | — | 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 | — | — | — | — | — | 1 | — | — | — | — | — | — |
Temp °C | 16 | 15 | 15 | 15 | 17 | 16 | 16 | 18 | 17 | 17 | 17 | 16 | 16 | 16 | 15 | 16 | 15 | 14 | 15 | 17 |
Feels °C | 11 | 11 | 14 | 13 | 18 | 15 | 16 | 15 | 14 | 15 | 15 | 10 | 11 | 12 | 12 | 14 | 13 | 11 | 11 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 7 | SW 7 | SW 7 | SW 5 | SW 4 | WSW 4 | SW 5 | — | WSW 6 | NW 4 | W 17 | W 16 | NNW 4 | — | SW 6 | SW 6 | SW 5 | WSW 5 | SW 5 | NW 4 |
| kJ | 5 | 2 | 2 | 1 | 1 | 2 | 6 | — | 41 | 4 | 6 | 5 | 2 | — | 35 | 16 | 5 | 2 | 1 | 3 |
Swell 2 Height (m) Direction Period (s) | — | SW 7 | — | W 7 | W 7 | — | NW 3 | — | W 16 | W 17 | — | — | — | — | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 |
| kJ | — | 2 | — | 1 | 1 | — | 1 | — | 5 | 5 | — | — | — | — | 8 | 8 | 8 | 7 | 7 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | W 17 | — | — | — | — | — | — | W 10 | W 10 | W 16 | W 5 |
| kJ | — | — | — | — | — | — | — | — | — | 5 | — | — | — | — | — | — | 2 | 2 | 5 | 1 |
Wind waves Height (m) Direction Period (s) | NNW 4 | NNE 3 | — | — | — | WSW 5 | — | SW 4 | NW 3 | SW 6 | W 6 | W 4 | WSW 5 | WSW 5 | NW 4 | NW 4 | NNW 3 | NW 4 | NW 4 | ENE 2 |
| kJ | 16 | 2 | — | — | — | 7 | — | 29 | 3 | 27 | 23 | 37 | 50 | 86 | 14 | 14 | 1 | 12 | 9 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 354 | 298 | 298 | 301 | 200 | 303 | 336 | 550 | 308 | 533 | 141 | 277 | 298 | 289 | 138 | 405 | 113 | 125 | 189 | 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.
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