Surf Forecasts:
Porth Ceriad surf forecast from 8 Aug 2026:
- Most powerful swell: Thursday 13 Aug, 1AM (local time) - 1.5ft (0.4m), 9s period, SW swell with 21 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 0.4m 9s and forecast to arrive on Thursday (Aug 13) 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 0.6m 4s period and expected on Friday (Aug 14) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Thu 13th Aug) | 1.5ft (0.4m) 9s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Right, let’s be honest with you. I’ve had a proper look at the charts for Porth Ceriad, and it’s a grim picture for the next couple of weeks. We’re looking at a long stretch of flat, weak surf. The swell energy is just pathetic, mostly sitting in single digits and low teens, struggling to even reach 23 on the 16th. For a spot that’s fairly consistent, this is a proper dead spell.
The water’s a balmy 65° right now, which is much warmer than normal for this time of year—that’s a bit of a treat if you’re just having a paddle, but it doesn’t help the waves.
The first week and a half is basically a write-off. From the 8th through to the 18th, we’re talking about ankle-biters. There’s a bit of a bump on the 19th, Wednesday, with the swell picking up to about 4ft from the west, but the energy is still weak and the wind is all over the shop, cross-onshore and choppy. It’s not going to be pretty. The Thursday the 20th cleans up with a strong offshore, but the swell drops back down to around 2ft. There’s just no power in the water.
The tail end of the window, around the 21st to the 23rd, shows some longer period swells, up to 15 seconds. But the height is still tiny, just a few inches. That’s a lot of push with nothing behind it. It might be glassy, but you’d be floating, not surfing.
Honestly, there’s nothing here that gets the heart racing. There are no standout days, no hidden gems. We’re in a proper flat spell. The only thing I’d say is that these calm runs don’t usually last forever. The consistency is there in the long run, so it won’t be poor for too long. Forecasts can change. But for now, leave the board in the van.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Sun afternoon, min 14°C on Sat morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Wed afternoon, min 15°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
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 11 | SW 8 | WSW 7 | SW 6 | SW 12 | WSW 3 | WSW 4 | SW 5 | SW 6 | SE 3 | SW 6 | W 11 | WSW 10 | WSW 10 | SW 9 | SW 8 | SW 8 | WSW 4 | SW 6 | WSW 6 | SW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 5 | 3 | 5 | 7 | 6 | 2 | 1 | 5 | 6 | 2 | 2 | 3 | 10 | 9 | 21 | 17 | 16 | 12 | 17 | 13 | 6 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | on | cross-on | glassy | off | cross-off | cross-off | cross-on | cross-off | cross-on | cross-on | glassy | on | on | off | cross-off | cross-off | cross-off | off |
High Tide | 4:47PM3.30m | 5:27AM3.38m | 6:03PM3.53m | 6:38AM3.60m | 7:06PM3.90m | 7:36AM3.87m | 7:59PM4.30m | 8:26AM4.13m | 8:47PM4.64m | 9:12AM4.31m | 9:31PM4.85m | 9:55AM4.39m | 10:13PM4.92m | ||||||||
Low Tide | 11:26AM1.31m | 00:15AM1.24m | 12:58PM1.15m | 1:37AM0.91m | 2:04PM0.85m | 2:37AM0.52m | 2:57PM0.55m | 3:28AM0.17m | 3:43PM0.31m | 4:13AM-0.07m | 4:24PM0.16m | 4:55AM-0.16m | 5:03PM0.12m | ||||||||
 |  |  | |  | | | |  | | | | | | | | | | | | | |
 | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:56 | — | — |
 | — | 8:59 | — | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — | — | 8:51 | — | — | 8:49 | — | — | 8:46 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 17 | 17 | 17 | 18 | 18 | 16 | 17 | 18 | 23 | 23 | 23 | 24 | 28 | 22 | 18 | 21 | 20 | 15 | 17 | 17 |
Feels °C | 13 | 16 | 16 | 16 | 17 | 18 | 13 | 13 | 14 | 21 | 22 | 23 | 21 | 27 | 20 | 19 | 20 | 19 | 11 | 14 | 15 |
Swell 1 Height (m) Direction Period (s) | WSW 3 | WSW 3 | WSW 7 | SW 6 | SW 6 | WSW 3 | WSW 4 | SW 5 | N 3 | SW 6 | SW 6 | SW 6 | WSW 10 | WSW 10 | SW 9 | SW 8 | SW 8 | WSW 4 | SW 6 | WSW 6 | SW 5 |
| kJ | 1 | 1 | 5 | 7 | 2 | 2 | 1 | 5 | 2 | 2 | 2 | 1 | 10 | 9 | 21 | 17 | 16 | 12 | 17 | 13 | 6 |
Swell 2 Height (m) Direction Period (s) | SW 11 | SW 8 | — | WSW 3 | SW 12 | SW 6 | SW 6 | — | SW 6 | — | — | W 11 | — | SW 5 | — | — | — | SW 9 | W 9 | NW 4 | — |
| kJ | 5 | 3 | — | 1 | 6 | 1 | 1 | — | 6 | — | — | 3 | — | 1 | — | — | — | 3 | 2 | 4 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | W 12 | — | — | — | — | — | — | — | — | SW 6 | — | — | — | — | — | — | W 8 | W 8 |
| kJ | — | — | — | 3 | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 1 | 1 |
Wind waves Height (m) Direction Period (s) | — | — | WSW 3 | — | — | — | NNW 3 | NNW 3 | ENE 2 | SE 3 | — | — | SE 3 | W 6 | — | — | — | NW 4 | NW 4 | — | — |
| kJ | — | — | 1 | — | — | — | 2 | 4 | 1 | 1 | — | — | 1 | 3 | — | — | — | 8 | 10 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 298 | 354 | 298 | 303 | 303 | 305 | 303 | 305 | 298 | 307 | 329 | 134 | 189 | 184 | 125 | 138 | 317 | 125 | 138 | 549 | 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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