Surf Forecasts:
Porth Ceriad surf forecast from 18 Jul 2026:
- Most powerful swell: Saturday 18 Jul, 7PM (local time) - 0.5ft (0.1m), 11s period, SW swell with 5 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 0.1m 11s and forecast to arrive on Saturday (Jul 18) at 7PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Wednesday (Jul 22) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Sat 18th Jul) | 0.5ft (0.1m) 11s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the table for the next sixteen days. I gotta be straight with you, it’s looking pretty lean for a while. There’s a big gap of nothing but flatness and poor conditions at the start, so we’re waiting a long time before we even get a whisper of a wave.
The first real surf we can talk about won’t show up until late in the run. We’ve got a long stretch of practically no swell from now until the last week of July. The first half of the forecast is all about tiny bumps and flat spells, with strong offshore winds cleaning up a surface that has no energy. It’s a patience game.
Now, holding out for the best of what’s on offer, we finally get a pulse around Monday the 27th of July. That morning, Porth Ceriad will see a chest-high swell rolling in from the West at 5 ft, with a period of 5 seconds. The combined energy of all swells directed here is moderate (129), and it’s coming in clean with a gentle cross-offshore breeze. It’s a fairly consistent spot, exposed to the SW, so the direction is working. The water is around 66°F which is much warmer than normal for this time of year—about 7°F above average, which is very unusual. This is a solid beginner-friendly wave, but it might be a touch too much for absolute beginners given the size. The wind is light, so it’ll be clean. Crowds are likely here, especially on a Monday.
The stand-out, though, and the one I’d circle on the calendar, is that Monday morning. It’s the only real swell of note in the whole 16-day window. After that, the week trailing off looks small and inconsistent again. That’s your window. Don’t blink.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Fri night, min 13°C on Fri night). Winds decreasing (fresh winds from the NNW on Sat morning, calm by Sat night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Tue afternoon, min 11°C on Tue night). Winds increasing (light winds from the N on Mon night, fresh winds from the NNW by Wed morning). | ||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | |||||||||||||||
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 6 | S 5 | W 11 | NNW 4 | NNW 3 | N 4 | NNW 5 | NNW 4 | N 4 | NNW 5 | NNW 4 | W 16 | NNW 4 | NNW 5 | NW 6 | NNW 6 | NNW 4 | N 5 | W 13 | W 13 | SW 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1 | 1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 1 | 0 | 0 | 0 | 3 | 3 | 3 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | glassy | cross-off | off | off | off | off | off | cross-off | off | off | off | off | off | off | off | glassy | on | glassy |
High Tide | 11:43AM4.06m | 00:03AM4.51m | 12:29PM3.83m | 00:49AM4.19m | 1:15PM3.57m | 1:38AM3.80m | 2:07PM3.31m | 2:32AM3.43m | 3:07PM3.10m | 3:38AM3.13m | 4:19PM2.98m | 4:54AM2.99m | 5:31PM3.01m | ||||||||
Low Tide | 6:44AM0.09m | 6:50PM0.46m | 7:26AM0.32m | 7:30PM0.68m | 8:08AM0.62m | 8:12PM0.93m | 8:49AM0.93m | 8:56PM1.18m | 9:34AM1.21m | 9:49PM1.39m | 10:30AM1.41m | 11:05PM1.51m | 11:50AM1.50m | 00:39AM1.48m | |||||||
 | |  | | |  |  | | | | | | | | | | | | | |  | |
 | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — |
 | — | — | 9:31 | — | — | 9:30 | — | — | 9:30 | — | — | 9:28 | — | — | 9:27 | — | — | 9:25 | — | — | 9:23 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 |
Temp °C | 14 | 18 | 18 | 16 | 17 | 17 | 14 | 17 | 17 | 16 | 18 | 16 | 16 | 16 | 15 | 16 | 17 | 18 | 16 | 17 | 17 |
Feels °C | 9 | 14 | 16 | 14 | 14 | 13 | 9 | 13 | 14 | 14 | 15 | 13 | 10 | 10 | 10 | 15 | 14 | 16 | 15 | 16 | 17 |
Swell 1 Height (m) Direction Period (s) | SW 6 | S 5 | N 5 | NNW 4 | — | — | N 5 | — | NW 4 | NNW 5 | — | W 16 | — | — | NW 6 | — | — | N 5 | N 4 | — | — |
| kJ | 1 | 1 | 16 | 2 | — | — | 1 | — | 4 | 3 | — | 5 | — | — | 1 | — | — | 2 | 2 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | W 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 13 | W 13 | — |
| kJ | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 4 | NNW 5 | ENE 2 | — | NNW 3 | N 4 | NNW 5 | NNW 4 | N 4 | NNW 5 | NNW 4 | N 4 | NNW 4 | NNW 5 | NNW 6 | NNW 6 | NNW 4 | N 3 | — | — | SW 3 |
| kJ | 10 | 56 | 1 | — | 3 | 9 | 14 | 39 | 13 | 15 | 39 | 19 | 34 | 86 | 37 | 18 | 11 | 1 | — | — | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 319 | 319 | 213 | 319 | 306 | 303 | 316 | 325 | 303 | 253 | 306 | 77 | 77 | 77 | 77 | 213 | 341 | 303 | 303 | 289 | 303 |
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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