Surf Forecasts:
Porth Ceriad surf forecast from 30 Aug 2026:
- Most powerful swell: Thursday 3 Sep, 10PM (local time) - 6.5ft (2.0m), 7s period, WSW swell with 361 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 2.0m 7s and forecast to arrive on Thursday (Sep 03) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Monday (Aug 31) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Thu 3rd Sep) | 6.5ft (2.0m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, let’s get real. This stretch is a flat spell, plain and simple. Over the full 16 days, there’s barely a sniff of decent surf. Porth Ceriad – a beginner-friendly spot that’s fairly consistent and exposed to the southwest – is the only break in the mix, and it’s mostly a battle against bad wind and small, weak swell.
The water temp is sitting at about 66°, which is roughly 5° above the long-term average for this time of year – so noticeably warmer than usual.
The first few days are a bust. Sunday 30th through to Thursday 3rd September are all poor – risk of thunderstorms, strong onshore winds, and lumpy, choppy conditions. The swell is small and weak, with combined energy mostly in the double digits to low triple digits – nothing to get excited about. Friday 4th and Saturday 5th are still poor, with a tiny clean window on Saturday morning but only 2ft of swell and energy in the 20s to 40s. Not worth it.
Sunday 6th to Tuesday 8th September is a total blank – tiny waves, poor winds, no energy. Wednesday 9th is the same story.
The one real chance comes Thursday 10th September. The swell bumps up to around 6ft from the SSW and SW, with combined energy hitting 218 to 245 – that’s moderate to strong. The winds are light to moderate cross-shore, so it’s not perfect, but there’s some size. Still, the surf quality is marked as poor, so it’s a gamble.
Friday 11th September morning is the only true standout. The swell is 5ft from the SW at 8 seconds, and the wind shifts to a light offshore from the NNW at 9 mph. It’s clean, gentle, and the combined energy is 204. This is your best window – small but clean, with offshore winds. After that, Saturday 12th has a tiny glassy morning (2ft, 50 energy) but it’s ordinary, and the rest of the forecast fades into nothing.
So, if you’re hanging for a wave, Friday 11th September morning is the one. Otherwise, it’s a dry spell, and you’ll be waiting for a change in the forecast.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Sun afternoon. Very mild (max 18°C on Sun morning, min 14°C on Mon morning). Winds decreasing (strong winds from the NW on Sun night, light winds from the W by Mon night). | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Thu night. Very mild (max 18°C on Wed morning, min 14°C on Fri night). Winds increasing (moderate winds from the WSW on Thu morning, near gales from the SW by Thu night). | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 8 | SSW 5 | SW 8 | SW 9 | SW 9 | WSW 8 | SW 4 | SW 5 | SW 5 | SW 6 | SW 6 | SW 7 | WSW 7 | SW 6 | WSW 7 | WSW 7 | WSW 5 | SW 6 | WSW 6 | NW 5 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 72 | 59 | 125 | 148 | 118 | 43 | 24 | 74 | 55 | 193 | 171 | 286 | 165 | 191 | 361 | 129 | 90 | 42 | 22 | 19 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-off | cross-off | cross-on | cross |
High Tide | 10:14AM4.29m | 10:31PM4.67m | 10:49AM4.33m | 11:07PM4.61m | 11:27AM4.26m | 11:46PM4.43m | 12:07PM4.09m | 00:30AM4.13m | 12:53PM3.82m | 1:20AM3.76m | 1:48PM3.50m | 2:24AM3.37m | 3:01PM3.24m | 3:49AM3.13m | |||||||
Low Tide | 5:11PM0.35m | 5:39AM0.26m | 5:43PM0.44m | 6:11AM0.42m | 6:15PM0.60m | 6:44AM0.65m | 6:48PM0.80m | 7:21AM0.92m | 7:31PM1.04m | 8:15AM1.21m | 8:50PM1.27m | 9:45AM1.42m | 10:41PM1.35m | ||||||||
 | |  |  |  |  |  | |  |  | | | | |  | |  |  | | | | |
 | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — |
 | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:05 | — | — | 8:02 | — | — | 8:00 | — | — | 7:58 | — |
mm | 3 | 4 | 4 | — | — | — | 1 | — | 5 | 3 | — | — | — | — | 7 | — | — | — | — | — | — |
Temp °C | 18 | 17 | 16 | 14 | 16 | 17 | 16 | 16 | 17 | 18 | 17 | 17 | 15 | 16 | 17 | 15 | 18 | 16 | 14 | 15 | 16 |
Feels °C | 14 | 12 | 13 | 7 | 13 | 15 | 12 | 11 | 13 | 14 | 12 | 12 | 10 | 12 | 11 | 9 | 12 | 10 | 9 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | SW 9 | SW 9 | NW 4 | — | — | W 16 | — | — | — | — | — | — | SW 14 | NW 5 | SW 6 | WSW 6 | NW 5 | SW 6 |
| kJ | 72 | 17 | 125 | 148 | 118 | 5 | — | — | 5 | — | — | — | — | — | — | 8 | 8 | 42 | 22 | 19 | 5 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 | SW 14 | SW 13 | NNW 4 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 | 7 | 7 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 14 | — | — | SW 13 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | 7 |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 5 | — | NW 6 | NW 5 | WSW 8 | SW 4 | SW 5 | SW 5 | SW 6 | SW 6 | SW 7 | WSW 7 | SW 6 | WSW 7 | WSW 7 | WSW 5 | NW 4 | NW 5 | SW 6 | SW 3 |
| kJ | 10 | 59 | — | 131 | 38 | 43 | 24 | 74 | 55 | 193 | 171 | 286 | 165 | 191 | 361 | 129 | 90 | 29 | 46 | 17 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 319 | 312 | 3 | 494 | 120 | 3 | 236 | 296 | 229 | 312 | 342 | 262 | 262 | 252 | 272 | 141 | 255 | 126 | 139 | 295 | 125 |
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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