Surf Forecasts:
Porth Ceriad surf forecast from 24 Aug 2026:
- Most powerful swell: Friday 28 Aug, 1PM (local time) - 3.5ft (1.1m), 8s period, SW swell with 167 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 8s and forecast to arrive on Friday (Aug 28) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Saturday (Aug 29) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Fri 28th Aug) | 3.5ft (1.1m) 8s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a proper look at what Porth Ceriad has in store for us over the next couple of weeks. I’ll be straight with you – the first week is a bit of a write-off, but there’s a glimmer of hope further out.
Right from the start, we’re looking at a long, quiet stretch. From Monday the 24th of August right through to the morning of Wednesday the 2nd of September, there’s just nothing doing. The swell is tiny, less than three feet, and the energy in the water is barely registering – we're talking weak readings as low as 5 to 19 (combined energy). The few moments where the wind goes offshore or clean are on tiny, ankle-high leftovers. It’s a proper flat spell, and the water temp is sitting right about average for this time of year.
We finally get a pulse of real size on Wednesday the 2nd of September. A solid 6 to 8ft southwest swell rolls in, and the energy jumps to a strong 228 to 554. That’s proper power. But here’s the kicker – the wind is howling onshore with the strong breeze, and the swell period is a short, junky 6 to 7 seconds. It’s going to be messy and blown out. Honestly, with that much wind and that kind of lumpy, short-period swell on a beach setup, this looks more interesting for the kite surfers than for paddle surfing.
The quality cleans up by Thursday the 3rd of September, but the swell drops back to a mediocre 7ft with a cross-onshore breeze, and it’s still got that short 6-second period. Not great.
The real standout, and the only one worth circling on the calendar, is Tuesday the 8th of September morning. A clean 3ft southwest swell, period of 8 seconds, and clean conditions with a moderate offshore wind. It’s not massive, but after all that nothing, three feet of clean, lined-up surf with moderate energy (125) will feel like a gift. That’s your best bet.
So, to sum it up: a long flat start, a messy pulse of big swell, and then a tidy little window on the 8th that should actually be fun. Get out there for that Tuesday morning glass-off.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Tue afternoon, min 15°C on Sun night). Winds decreasing (strong winds from the E on Tue night, light winds from the ESE by Wed morning). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Sat afternoon. Warm (max 20°C on Wed night, min 15°C on Fri night). Winds increasing (calm on Thu afternoon, strong winds from the S by Sat afternoon). | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
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 10 | SW 13 | E 3 | E 3 | SW 13 | W 13 | SSW 8 | SSW 8 | W 12 | SW 12 | WSW 12 | SW 10 | SSW 5 | WSW 6 | SW 7 | WSW 4 | WSW 4 | WSW 5 | SW 5 | SW 8 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 9 | 7 | 8 | 7 | 7 | 3 | 6 | 6 | 3 | 6 | 16 | 144 | 44 | 96 | 33 | 36 | 32 | 15 | 4 | 31 | 51 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | off | cross | cross | cross-off | cross | cross | cross | cross | on | glassy | cross-on | cross-on | cross-on | off | on | cross-on | cross | cross-on | cross-on | cross |
High Tide | 6:45AM2.97m | 7:07PM3.26m | 7:28AM3.22m | 7:46PM3.59m | 8:04AM3.49m | 8:20PM3.91m | 8:37AM3.75m | 8:52PM4.21m | 9:08AM3.98m | 9:23PM4.45m | 9:41AM4.17m | 9:56PM4.61m | 10:14AM4.29m | 10:31PM4.67m | |||||||
Low Tide | 1:44PM1.32m | 2:15AM1.10m | 2:25PM1.03m | 2:53AM0.81m | 3:01PM0.77m | 3:27AM0.54m | 3:34PM0.55m | 4:01AM0.34m | 4:07PM0.40m | 4:34AM0.22m | 4:39PM0.34m | 5:06AM0.19m | 5:11PM0.35m | ||||||||
 |  |  |  | |  | | |  | | |  | | | | |  | |  |  | | |
 | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — |
 | — | 8:25 | — | — | 8:22 | — | — | 8:21 | — | — | 8:19 | — | — | 8:16 | — | — | 8:14 | — | — | 8:12 | — |
mm | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | 1 | — | 5 | 3 | 2 | 2 | 3 |
Temp °C | 18 | 22 | 19 | 19 | 24 | 21 | 20 | 20 | 20 | 18 | 19 | 17 | 16 | 17 | 18 | 16 | 16 | 17 | 16 | 18 | 17 |
Feels °C | 16 | 18 | 12 | 17 | 19 | 13 | 20 | 20 | 19 | 18 | 20 | 16 | 14 | 12 | 13 | 12 | 11 | 12 | 9 | 9 | 10 |
Swell 1 Height (m) Direction Period (s) | WSW 10 | — | SW 13 | SW 13 | SW 8 | SW 8 | SSW 8 | SSW 8 | SW 7 | SW 7 | WSW 12 | SW 10 | SW 8 | SW 6 | SW 7 | NNW 5 | NNW 5 | WSW 5 | SW 5 | SW 8 | SW 7 |
| kJ | 9 | — | 7 | 7 | 3 | 3 | 6 | 6 | 2 | 2 | 15 | 144 | 44 | 76 | 33 | 17 | 5 | 15 | 4 | 31 | 51 |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 9 | SW 9 | SW 8 | SW 13 | — | — | W 12 | — | SW 12 | S 7 | — | — | — | — | — | NW 5 | — | — | — | — |
| kJ | 8 | 3 | 3 | 3 | 7 | — | — | 3 | — | 6 | 1 | — | — | — | — | — | 1 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | SW 13 | — | — | — | W 13 | — | — | W 12 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 7 | — | — | — | 3 | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SE 3 | — | E 3 | E 3 | E 3 | E 2 | ESE 3 | — | — | SSE 2 | SW 4 | SW 4 | SSW 5 | WSW 6 | NW 5 | WSW 4 | WSW 4 | — | W 3 | — | — |
| kJ | 2 | — | 8 | 6 | 1 | 1 | 1 | — | — | 1 | 16 | 12 | 44 | 96 | 94 | 36 | 32 | — | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 298 | 301 | 273 | 254 | 255 | 133 | 200 | 319 | 312 | 252 | 129 | 3 | 126 | 296 | 5 | 252 | 289 | 272 | 298 | 327 | 327 |
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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