Surf Forecasts:
Porth Ceriad surf forecast from 2 Sep 2026:
- Best quality surf: Monday 7 Sep, 7AM (local time) - 1ft (0.3m), 13s period, WSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 10PM (local time) - 6.5ft (2.0m), 7s period, SW swell with 363 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 7AM (local time) - 1ft (0.3m), 13s 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 0.3m and 13s period with a secondary swell of 0.5m and 6s. 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 2.0m 7s and forecast to arrive on Wednesday (Sep 02) 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 1.2m 5s period and expected on Saturday (Sep 05) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Mon 7th Sep) | 1ft (0.3m) 13s |
| Best Surf | 7AM (Mon 7th Sep) | 1ft (0.3m) 13s |
| Most Powerful | 10PM (Wed 2nd Sep) | 6.5ft (2.0m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, let’s break it down in feet and miles per hour.
First up, it’s a rough start for Porth Ceriad. The first few days are a total washout. Onshore wind, short-period junk, and the water is way warmer than it should be for early September – about 2° above normal. You’re looking at a solid week of nothing good. Don’t even think about it.
Then, on the morning of Friday the 11th, things finally turn. We get a moderate offshore wind from the north, and the swell comes in at 8ft from the WSW, with a period of 7 seconds. The combined energy is 502 – that’s a powerful wave. Conditions are clean. This is the standout of the whole run. It’s a bit big for beginners, but for anyone with some experience, this is the session. The afternoon of the 11th drops to 7ft, still clean and good.
The 13th is the other real highlight. Sunday the 13th morning has 6ft from the WSW with light offshore winds, and the afternoon gets even better: 7ft, clean, light breeze. Combined energy is 329 in the afternoon – proper fun waves. The 11th is the best, but the 13th is a close second and more user-friendly.
After that, the 16th looks big – 8ft on Wednesday morning (758 combined energy) – but the wind is fresh and cross-off, and the surf is rated poor. Probably too windy and messy. The 17th morning has a clean 5ft, but it’s only marginal.
So, don’t even look at the water before the 11th. The morning of the 11th and the afternoon of the 13th are your windows. That’s where it’s at.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Wed morning. Very mild (max 17°C on Wed morning, min 13°C on Fri night). Winds decreasing (strong winds from the S on Wed morning, light winds from the WNW by Fri night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Mon afternoon. Warm (max 20°C on Sun afternoon, min 13°C on Sat morning). Winds increasing (light winds from the WNW on Sun night, strong winds from the WSW by Mon night). | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
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) | SSW 5 | SW 6 | SW 7 | SW 7 | SW 6 | SW 7 | WSW 7 | WSW 5 | SW 8 | WSW 6 | SW 6 | SW 6 | S 4 | SW 5 | SW 6 | WSW 13 | SW 5 | WSW 6 | WSW 6 | WSW 6 | W 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 52 | 161 | 314 | 151 | 141 | 215 | 214 | 94 | 15 | 26 | 18 | 9 | 16 | 42 | 42 | 31 | 107 | 198 | 207 | 190 | 154 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-off | cross | cross-on | on | on | on | cross-on | cross | cross-on | cross | cross | cross | cross-off |
High Tide | 12:07PM4.09m | 00:30AM4.13m | 12:53PM3.82m | 1:20AM3.76m | 1:48PM3.50m | 2:24AM3.37m | 3:01PM3.24m | 3:49AM3.13m | 4:32PM3.23m | 5:21AM3.19m | 5:54PM3.50m | 6:32AM3.46m | 6:56PM3.92m | ||||||||
Low Tide | 6:48PM0.80m | 7:21AM0.92m | 7:31PM1.04m | 8:15AM1.21m | 8:50PM1.27m | 9:45AM1.42m | 10:41PM1.35m | 11:30AM1.41m | 00:19AM1.15m | 12:52PM1.16m | 1:31AM0.77m | 1:53PM0.82m | 2:25AM0.38m | ||||||||
 |  |  | |  |  | |  |  | | |  | | | | |  | | | | | |
 | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:37 | — | — | 6:39 | — | — |
 | — | 8:05 | — | — | 8:02 | — | — | 8:00 | — | — | 7:58 | — | — | 7:55 | — | — | 7:52 | — | — | 7:51 | — |
mm | 7 | — | — | — | — | 8 | — | — | — | — | — | — | — | — | — | — | 2 | — | — | 2 | — |
Temp °C | 17 | 17 | 17 | 17 | 17 | 16 | 15 | 17 | 16 | 13 | 14 | 15 | 18 | 20 | 17 | 15 | 16 | 14 | 14 | 15 | 14 |
Feels °C | 12 | 13 | 12 | 13 | 12 | 10 | 9 | 11 | 10 | 11 | 12 | 12 | 12 | 16 | 14 | 12 | 8 | 5 | 5 | 5 | 4 |
Swell 1 Height (m) Direction Period (s) | W 16 | — | — | SW 15 | — | SW 14 | SW 15 | — | SW 8 | WSW 6 | SW 6 | SW 6 | SW 13 | SW 13 | SW 6 | WSW 13 | — | — | — | — | — |
| kJ | 5 | — | — | 8 | — | 8 | 8 | — | 15 | 26 | 18 | 9 | 7 | 6 | 42 | 31 | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | W 16 | — | — | — | — | — | — | — | SW 14 | NW 5 | NW 4 | SW 13 | W 8 | — | SW 12 | — | — | — | — | — | — |
| kJ | 5 | — | — | — | — | — | — | — | 8 | 14 | 4 | 7 | 1 | — | 6 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SW 14 | SW 13 | — | W 13 | — | W 15 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 7 | 7 | — | 3 | — | 4 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SW 6 | SW 7 | SW 7 | SW 6 | SW 7 | WSW 7 | WSW 5 | W 5 | — | — | — | S 4 | SW 5 | SW 4 | WSW 4 | SW 5 | WSW 6 | WSW 6 | WSW 6 | W 6 |
| kJ | 52 | 161 | 314 | 151 | 141 | 215 | 214 | 94 | 70 | — | — | — | 16 | 42 | 7 | 10 | 107 | 198 | 207 | 190 | 154 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 301 | 303 | 262 | 252 | 552 | 262 | 120 | 494 | 126 | 3 | 193 | 113 | 280 | 134 | 184 | 120 | 638 | 502 | 448 | 785 | 738 |
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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