Surf Forecasts:
Porth Ceriad surf forecast from 10 Sep 2026:
- Best quality surf: Friday 11 Sep, 4AM (local time) - 3.5ft (1.1m), 9s period, WSW swell with cross-offshore winds.
- Most powerful swell: Saturday 12 Sep, 4PM (local time) - 6.5ft (2.0m), 7s period, SW swell with 347 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 4AM (local time) - 3.5ft (1.1m), 9s 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 Friday (Sep 11) at 4AM. The primary swell is predicted to be 1.1m and 9s period with a secondary swell of 1.1m and 7s. 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 Saturday (Sep 12) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Wednesday (Sep 16) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Fri 11th Sep) | 3.5ft (1.1m) 9s |
| Best Surf | 4AM (Fri 11th Sep) | 3.5ft (1.1m) 9s |
| Most Powerful | 4PM (Sat 12th Sep) | 6.5ft (2.0m) 7s |
Table - best surf conditions forecast for Porth Ceriad over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's be real – this stretch is a long haul of nothing much. Mostly onshore trash, howling winds, and flat spells. The only glimmer comes right at the end.
First surf is on Thursday the 10th at Porth Ceriad, but it's a mess. Southerly wind at 25 mph, a sloppy 4ft SSW swell, weak energy (90), and water temp is 64°F – way warmer than usual. Total no-go.
Friday the 11th is clean but tiny – 2ft, nice NW wind, but no power. The weekend is a washout. Saturday the 12th hits 7ft with a strong SW cross-onshore, energy moderate (347) but the quality is trash. Sunday the 13th is back to tiny, clean but flat.
The whole first week is a blank. The one real standout is Monday the 21st. That morning, Porth Ceriad is glassy with a 5ft WSW swell. A light NNE breeze, zero wind, and combined energy of 106 – moderate but clean. The period is short (5 seconds), so it's a bit weak, but with conditions that perfect, it's your best bet. Water is still warm for September.
After that, Tuesday and Wednesday are clean but tiny. Thursday the 24th brings a 7ft WSW swell with moderate energy (415), but it's cross-onshore and choppy – better for kite gear than a paddle board.
Bottom line: if you can wait for Monday the 21st, be there at first light. It's the only truly clean, rideable wave in the whole 16-day forecast. Before that, you're just wasting time.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Thu afternoon. Very mild (max 18°C on Thu night, min 14°C on Fri morning). Winds decreasing (strong winds from the SSW on Thu morning, light winds from the W by Fri afternoon). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Mon morning. Very mild (max 18°C on Mon morning, min 14°C on Tue night). Winds increasing (light winds from the WSW on Sun afternoon, strong winds from the NNW by Tue night). | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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 7 | WSW 7 | SW 7 | SW 8 | SW 3 | SW 6 | SW 7 | SW 7 | SW 6 | WSW 6 | SW 6 | SW 5 | SW 5 | SW 6 | WSW 6 | WSW 6 | SW 6 | WSW 7 | WSW 6 | WSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 88 | 371 | 127 | 47 | 33 | 11 | 193 | 347 | 158 | 51 | 26 | 29 | 58 | 93 | 101 | 68 | 39 | 19 | 18 | 4 | 4 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross | cross-off | cross | cross-on | cross-on | cross-on | cross | cross-off | cross-on | on | cross-on | cross-on | on | cross-off | cross-off | cross-off | off | cross-off | cross-off |
High Tide | 8:30PM4.65m | 8:54AM4.33m | 9:11PM4.83m | 9:33AM4.45m | 9:50PM4.85m | 10:10AM4.47m | 10:28PM4.72m | 10:46AM4.37m | 11:05PM4.46m | 11:22AM4.16m | 11:41PM4.11m | 11:57AM3.87m | 00:18AM3.70m | ||||||||
Low Tide | 3:23PM0.27m | 3:51AM-0.09m | 4:02PM0.14m | 4:29AM-0.11m | 4:37PM0.12m | 5:03AM0.00m | 5:10PM0.20m | 5:34AM0.22m | 5:41PM0.37m | 6:02AM0.51m | 6:10PM0.60m | 6:28AM0.82m | 6:38PM0.87m | ||||||||
 | |  |  |  | | |  |  | | | | | | | | | | | |  | |
 | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — |
 | — | 7:45 | — | — | 7:44 | — | — | 7:40 | — | — | 7:38 | — | — | 7:37 | — | — | 7:34 | — | — | 7:31 | — |
mm | 1 | 2 | 1 | — | — | 1 | 4 | — | — | — | — | — | 1 | — | 2 | — | — | 1 | — | — | — |
Temp °C | 16 | 17 | 18 | 14 | 14 | 16 | 16 | 17 | 18 | 15 | 15 | 17 | 18 | 18 | 18 | 15 | 16 | 16 | 14 | 15 | 15 |
Feels °C | 9 | 12 | 14 | 9 | 12 | 10 | 10 | 12 | 15 | 13 | 15 | 15 | 15 | 15 | 15 | 12 | 13 | 11 | 7 | 10 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 8 | — | — | SW 7 | SW 8 | — | — | — | — | SW 6 | WSW 6 | SW 8 | W 9 | W 9 | W 12 | WSW 6 | WSW 6 | SW 6 | WSW 7 | WSW 6 | WSW 6 |
| kJ | 2 | — | — | 47 | 33 | — | — | — | — | 51 | 26 | 3 | 1 | 1 | 3 | 68 | 39 | 19 | 18 | 4 | 4 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | NW 4 | — | — | — | — | NW 4 | NW 4 | — | W 12 | W 12 | — | — | W 11 | — | — | SW 9 | — |
| kJ | — | — | — | — | 8 | — | — | — | — | 4 | 4 | — | 3 | 3 | — | — | 2 | — | — | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SW 7 | WSW 7 | NW 4 | — | SW 3 | SW 6 | SW 7 | SW 7 | NW 4 | — | SW 6 | SW 5 | SW 5 | SW 6 | NW 4 | NW 4 | NW 5 | NW 6 | NW 5 | NW 4 |
| kJ | 88 | 371 | 127 | 16 | — | 11 | 193 | 347 | 158 | 11 | — | 29 | 58 | 93 | 101 | 10 | 20 | 94 | 176 | 74 | 24 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 320 | 103 | 3 | 125 | 3 | 246 | 252 | 324 | 3 | 200 | 252 | 132 | 252 | 252 | 151 | 337 | 571 | 126 | 141 | 126 | 139 |
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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