Surf Forecasts:
Porth Ceriad surf forecast from 6 Sep 2026:
- Best quality surf: Monday 7 Sep, 7AM (local time) - 3ft (0.9m), 6s period, WSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 1AM (local time) - 7ft (2.2m), 7s period, WSW swell with 480 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 7AM (local time) - 3ft (0.9m), 6s 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 Monday (Sep 07) at 7AM. The primary swell is predicted to be 0.9m and 6s period with a secondary swell of 0.3m and 15s. Another secondary swell of 0.7m and 4s is also forecast. 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 2.2m 7s and forecast to arrive on Tuesday (Sep 08) 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 1.9m 6s period and expected on Tuesday (Sep 08) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Mon 7th Sep) | 3ft (0.9m) 6s |
| Best Surf | 7AM (Mon 7th Sep) | 3ft (0.9m) 6s |
| Most Powerful | 1AM (Tue 8th Sep) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, Rusty here again, but I’ll switch it up for the imperial crew.
We’re looking at a tough stretch for Porth Ceriad. For the first week or so, the wind is the enemy—constant onshore and cross-shore breezes ruining any chance of clean waves. The water is about 64°, which is much warmer than normal for September, so that’s a silver lining.
The swell energy is low to moderate for the first week, mostly under 100 of that combined energy reading. There’s a gap of dead days before we get to the only real window of hope.
That window is the morning of Wednesday, September 16th. We’ve got a 7 ft swell from the WSW, with a short period of 7 seconds. The combined energy jumps to 418—that’s a serious jump in power. The wind is a clean cross-off from the NW at 12 mph, which will leave the surface looking nice. The swell direction matches the optimum SW. This is the one to circle on the calendar. It’s not a massive swell, but for this spot, that’s a solid overhead wave with clean conditions.
After that, the 18th of September brings a big 8 ft swell from the WSW, with the energy reading hitting 704, but it’s onshore and lumpy. Too big and messy for a fun session unless you’re looking for a fight. That setup looks more like a kite-surfing day.
So the call is simple: Wednesday the 16th is your best shot. Clean, solid, and worth the wait. The rest is a write-off.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Mon night. Warm (max 20°C on Sun afternoon, min 13°C on Mon night). Winds increasing (light winds from the WNW on Sun night, strong winds from the SW by Mon night). | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Sat morning. Very mild (max 18°C on Thu night, min 14°C on Wed afternoon). Winds increasing (light winds from the W on Fri afternoon, strong winds from the SW by Sat morning). | |||||||||||||||||||
Sun 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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 | SW 14 | SW 5 | WSW 7 | WSW 6 | W 6 | NW 6 | WSW 6 | WSW 8 | WSW 4 | SW 6 | SW 6 | SW 7 | SW 6 | SW 6 | SW 8 | SW 5 | SW 6 | SW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 89 | 99 | 52 | 65 | 480 | 161 | 183 | 275 | 23 | 41 | 25 | 175 | 206 | 127 | 51 | 32 | 16 | 73 | 116 | 52 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross | cross-on | cross | cross | cross | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross | cross-off | cross-off | on | on | cross-on | off |
High Tide | 4:32PM3.23m | 5:21AM3.19m | 5:54PM3.50m | 6:32AM3.46m | 6:56PM3.92m | 7:27AM3.80m | 7:46PM4.33m | 8:12AM4.10m | 8:30PM4.65m | 8:54AM4.33m | 9:11PM4.83m | 9:33AM4.45m | 9:50PM4.85m | |||||||
Low Tide | 00:19AM1.15m | 12:52PM1.16m | 1:31AM0.77m | 1:53PM0.82m | 2:25AM0.38m | 2:41PM0.50m | 3:11AM0.08m | 3:23PM0.27m | 3:51AM-0.09m | 4:02PM0.14m | 4:29AM-0.11m | 4:37PM0.12m | ||||||||
 |  |  | |  |  | | | | |  |  | | | | | | | | | |
 | — | — | 6:37 | — | — | 6:39 | — | — | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — |
 | 7:55 | — | — | 7:52 | — | — | 7:51 | — | — | 7:49 | — | — | 7:45 | — | — | 7:44 | — | — | 7:40 | — |
mm | — | — | — | — | 3 | — | — | — | — | — | 1 | 1 | — | 2 | — | — | — | 3 | 1 | — |
Temp °C | 20 | 17 | 15 | 16 | 15 | 14 | 16 | 14 | 14 | 14 | 15 | 16 | 17 | 18 | 14 | 15 | 15 | 17 | 17 | 16 |
Feels °C | 16 | 13 | 10 | 11 | 7 | 6 | 8 | 5 | 8 | 10 | 10 | 10 | 13 | 13 | 10 | 12 | 13 | 9 | 12 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 13 | W 17 | SW 14 | — | — | — | — | WSW 7 | WSW 6 | NW 5 | N 4 | — | — | WSW 9 | SW 6 | SW 6 | SW 8 | SW 8 | SW 6 | SW 7 |
| kJ | 6 | 6 | 52 | — | — | — | — | 56 | 23 | 27 | 2 | — | — | 28 | 51 | 32 | 16 | 2 | 116 | 52 |
Swell 2 Height (m) Direction Period (s) | — | W 12 | WSW 10 | — | — | — | — | — | SW 8 | WSW 8 | — | — | — | — | WSW 9 | NW 5 | NNW 4 | — | — | — |
| kJ | — | 3 | 9 | — | — | — | — | — | 16 | 41 | — | — | — | — | 8 | 10 | 2 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | WSW 8 | — | — | — | — | — | WSW 8 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 6 | — | — | — | — | — | 6 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 6 | SW 6 | WSW 6 | SW 5 | WSW 7 | WSW 6 | W 6 | NW 6 | NW 6 | — | WSW 4 | SW 6 | SW 6 | SW 7 | NW 5 | — | S 3 | SW 5 | SW 6 | — |
| kJ | 89 | 99 | 37 | 65 | 480 | 161 | 183 | 275 | 108 | — | 25 | 175 | 206 | 127 | 26 | — | 2 | 73 | 68 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 295 | 246 | 3 | 272 | 252 | 262 | 556 | 494 | 126 | 3 | 229 | 312 | 448 | 141 | 125 | 0 | 125 | 298 | 371 | 0 |
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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