Surf Forecasts:
Porth Ceriad surf forecast from 19 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 4AM (local time) - 3.5ft (1.1m), 6s period, WSW swell with 93 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 1.1m 6s and forecast to arrive on Thursday (Aug 20) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Thursday (Aug 20) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Thu 20th Aug) | 3.5ft (1.1m) 6s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright folks, Rusty here again. Let’s cut to the chase. These next couple of weeks at Porth Ceriad look pretty bleak for the most part. The water is running much warmer than usual for the season, at around 67°F, which is nice, but the surf just isn't there.
Tuesday afternoon (Aug 18) we're looking at a tiny 2ft SW swell, but the wind is blowing onshore from the WSW, making it bumpy and ugly.
Wednesday (Aug 19) is shot. Fresh cross-shore winds up to 19 mph and a lumpy, weak swell of 3ft. Not worth the drive.
Thursday (Aug 20) is the pick of a bad bunch early on. The morning is clean with a light cross-offshore wind and a 2ft SW swell. It’s ankle to knee high, but at least it looks nice. The afternoon gets a good offshore breeze from the N, but the swell drops off to 2ft. Still, it’s clean.
Then it all dies. From Friday (Aug 21) through Monday (Aug 24) we are flat. Completely flat. A tiny 0.5ft ripple with no energy. The wind is offshore, but there is literally nothing to surf. This is a long spell of nothing.
Tuesday (Aug 25) picks up a little to 2ft, but it has a terrible 4-second period, and the wind is onshore in the morning. Forget it.
Wednesday (Aug 26) is all storm. Strong onshore winds up to 28 mph and a messy 2ft of slop. This is a write-off.
Thursday (Aug 27) has a glassy morning, but the swell is only 1ft. It’s pretty but empty.
Friday (Aug 28) and Saturday (Aug 29) are more interesting. The swell climbs to 4-4ft, but the wind is screaming onshore or cross-shore at 25 mph. This will be a complete wall of whitewater. This is definitely a day for the kiteboarders, not the surfers.
Sunday (Aug 30) is more of the same—lumpy, cross-onshore winds with a 2ft swell. Poor.
Monday (Aug 31) afternoon is the first time the ocean shows some real life. The swell jumps to 6ft from the SW, with moderate energy. But the wind is still on it from the SW, making it choppy and hard to paddle into.
So, our one true standout is on Wednesday, September 2nd. The forecast shows a 4-4ft SW swell with a light offshore/cross-offshore wind in the afternoon. The energy gets a boost, and for the first time, the conditions finally line up. It’s going to be clean and have some push. It’s still a week out, so treat it as promising, not a guarantee, but it's the one to wait for.
Bottom line: this run is mostly a dud, so save your energy for that final day. This is Rusty, signing off.
Short Range ForecastModerate rain (total 15mm), heaviest on Wed morning. Very mild (max 18°C on Tue afternoon, min 13°C on Thu night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Very mild (max 16°C on Sun night, min 12°C on Fri night). Winds decreasing (fresh winds from the NNW on Fri afternoon, calm by Mon morning). | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 | WSW 5 | WSW 4 | SW 5 | WSW 6 | SW 6 | SW 6 | SW 6 | W 14 | W 16 | W 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | WSW 4 |
Wave Graph  | ||||||||||||||||||||
 kJ | 29 | 27 | 22 | 22 | 80 | 43 | 21 | 10 | 7 | 7 | 7 | 9 | 9 | 8 | 8 | 7 | 8 | 8 | 7 | 7 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross-on | cross-off | cross-off | off | off | off | cross-off | off | off | off | off | off | cross-off | cross-off | cross-on | cross-off | cross-on |
High Tide | 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 | 7:22PM0.88m | 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 | |||||||
 |  |  | | | |  | | | |  |  | | | | | | | | | |
 | — | — | 6:05 | — | — | 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 | — | 4 | 2 | 1 | 5 | 1 | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 15 | 16 | 16 | 17 | 16 | 16 | 15 | 13 | 14 | 14 | 14 | 14 | 14 | 14 | 15 | 16 | 15 | 16 | 16 |
Feels °C | 16 | 12 | 12 | 11 | 14 | 11 | 11 | 11 | 9 | 9 | 8 | 10 | 9 | 10 | 10 | 11 | 13 | 14 | 14 | 15 |
Swell 1 Height (m) Direction Period (s) | NW 4 | W 17 | W 16 | NW 4 | SW 16 | SW 6 | SW 6 | SW 6 | WSW 6 | WSW 6 | SW 13 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | NW 4 | SW 14 | SW 14 | WSW 4 |
| kJ | 7 | 6 | 5 | 2 | 10 | 43 | 21 | 10 | 3 | 3 | 7 | 9 | 9 | 8 | 8 | 7 | 1 | 8 | 7 | 7 |
Swell 2 Height (m) Direction Period (s) | W 17 | W 17 | W 16 | — | — | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 6 | W 6 | W 12 | SW 12 | W 14 | — | SW 14 | — | W 9 | SW 13 |
| kJ | 5 | 6 | 5 | — | — | 8 | 8 | 8 | 7 | 7 | 1 | 1 | 3 | 6 | 4 | — | 8 | — | 1 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | W 14 | W 14 | W 16 | W 16 | — | W 10 | W 12 | W 9 | — | W 8 | W 9 | W 9 | W 8 |
| kJ | — | — | — | — | — | — | — | 4 | 4 | 5 | 5 | — | 2 | 3 | 2 | — | 1 | 1 | 2 | 1 |
Wind waves Height (m) Direction Period (s) | SW 6 | WSW 5 | WSW 4 | SW 5 | WSW 6 | NW 5 | NNW 5 | NNW 4 | NNW 4 | NW 4 | NNW 5 | NNW 4 | NNW 4 | NNW 4 | NNW 5 | NW 4 | — | — | SW 3 | — |
| kJ | 29 | 27 | 22 | 22 | 80 | 41 | 46 | 10 | 13 | 15 | 44 | 17 | 29 | 11 | 9 | 6 | — | — | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 373 | 130 | 277 | 301 | 307 | 120 | 126 | 125 | 125 | 277 | 303 | 273 | 189 | 189 | 277 | 323 | 200 | 298 | 298 | 298 |
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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