Surf Forecasts:
Porth Ceriad surf forecast from 27 Aug 2026:
- Best quality surf: Saturday 29 Aug, 4PM (local time) - 3.5ft (1.1m), 7s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 2 Sep, 10PM (local time) - 6.5ft (2.0m), 7s period, SW swell with 352 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 4PM (local time) - 3.5ft (1.1m), 7s period with SW 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 Saturday (Aug 29) at 4PM. The primary swell is predicted to be 1.1m and 7s period with a secondary swell of 0.3m and 3s. The wind is predicted to be glassy 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 (Aug 29) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Sat 29th Aug) | 3.5ft (1.1m) 7s |
| Best Surf | 4PM (Sat 29th Aug) | 3.5ft (1.1m) 7s |
| 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, Rusty here. Let's have a look at the forecast for Porth Ceriad.
This is a tough one, folks. Over the next 16 days, we're looking at a long stretch of very ordinary conditions, with a promising pulse right at the very end. The key here is patience. For the first week and a half, it's a write-off. The swell is tiny, the wind is messy, and it's just not worth getting wet. You'll see a lot of days with scores of zero, and the wave energy is mostly weak, often under 100. There's a steady run of onshore and cross-onshore winds really messing up what little swell there is.
Right now, the water temperature is about average for the time of year, so nothing to worry about there.
The first real glimmer of hope comes on Saturday, 30th August. The afternoon has a touch of glassy wind and a bit of swell, but it's still only 4 ft and the wave energy is weak at 134. It's surfable, but just barely. Then we get a few days of similar smallness, with a few clean windows in the mornings if you're desperate.
The big news is the standout on Friday, 11th September. That morning, we get a solid 8 ft swell from the west-southwest, with a moderate offshore wind from the north-northwest. The energy jumps way up to 538, which is a serious jump. The period is short at 7 seconds, so it'll be a bit fat and weak, but the offshore wind will clean it right up. This is the one to circle on the calendar. It's expert-level size, so only for the experienced crew. It's a long way out, so the forecast confidence is lower, but it's the best option we've got by a long shot.
Before that, Monday, 7th September morning also has a spike, with 7 ft from the west-northwest and a moderate offshore wind. The energy is 395, which is solid, but again, the period is short at 6 seconds. It's a good option, but the 11th September is the bigger, cleaner standout.
The rest of the period is small and poor. There's a big gap of almost no surfable surf from the start through to the end of August, with only a few tiny windows. Stick with it, and keep your eyes on that 11th September.
Rusty.
Short Range ForecastHeavy rain (total 53mm), heaviest during Thu afternoon. Warm (max 21°C on Wed night, min 16°C on Thu afternoon). Winds increasing (calm on Thu afternoon, fresh winds from the SSE by Fri night). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Tue morning. Very mild (max 17°C on Sun morning, min 15°C on Sat night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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 12 | SW 12 | SW 3 | SW 4 | SW 6 | SW 5 | SW 6 | SW 7 | SW 9 | SW 9 | SW 8 | SW 7 | SW 8 | SW 8 | SW 8 | SW 6 | SW 6 | SW 5 | SW 5 | SW 6 | WSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 6 | 5 | 20 | 19 | 84 | 91 | 132 | 159 | 91 | 53 | 43 | 61 | 37 | 31 | 31 | 16 | 35 | 42 | 149 | 211 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross-on | cross-off | cross-on | cross-on | on | glassy | cross-off | cross-on | cross-on | cross-on | cross-off | cross-off | cross-on | cross | cross-off | cross-off | glassy | cross-on | cross-on |
High Tide | 8:37AM3.75m | 8:52PM4.21m | 9:08AM3.98m | 9:23PM4.45m | 9:41AM4.17m | 9:56PM4.61m | 10:14AM4.29m | 10:31PM4.67m | 10:49AM4.33m | 11:07PM4.61m | 11:27AM4.26m | 11:46PM4.43m | 12:07PM4.09m | 00:30AM4.13m | |||||||
Low Tide | 3:34PM0.55m | 4:01AM0.34m | 4:07PM0.40m | 4:34AM0.22m | 4:39PM0.34m | 5:06AM0.19m | 5:11PM0.35m | 5:39AM0.26m | 5:43PM0.44m | 6:11AM0.42m | 6:15PM0.60m | 6:44AM0.65m | 6:48PM0.80m | ||||||||
 |  |  |  |  |  |  | | |  |  | | | |  | | |  | | | | |
 | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — |
 | — | 8:19 | — | — | 8:16 | — | — | 8:14 | — | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:05 | — |
mm | 4 | 16 | 9 | 6 | — | 8 | 6 | 3 | 1 | — | — | 1 | — | — | 2 | 4 | — | — | — | — | 1 |
Temp °C | 17 | 17 | 17 | 16 | 17 | 17 | 18 | 17 | 16 | 17 | 17 | 17 | 16 | 16 | 17 | 16 | 17 | 16 | 14 | 16 | 17 |
Feels °C | 16 | 18 | 16 | 14 | 16 | 14 | 14 | 15 | 10 | 15 | 16 | 15 | 15 | 13 | 14 | 11 | 14 | 11 | 10 | 11 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SW 6 | SSW 7 | W 12 | SW 6 | — | — | SW 7 | SW 9 | NNW 4 | SW 8 | SW 7 | SW 8 | SW 8 | SW 8 | SW 6 | NW 4 | W 16 | W 16 | — | SW 15 |
| kJ | 2 | 1 | 4 | 3 | 19 | — | — | 132 | 159 | 1 | 53 | 43 | 61 | 37 | 31 | 31 | 2 | 5 | 5 | — | 9 |
Swell 2 Height (m) Direction Period (s) | SW 12 | SW 12 | W 12 | — | — | — | — | — | — | NNW 4 | — | W 12 | SW 11 | WSW 11 | NNW 4 | W 11 | W 8 | W 16 | — | — | W 15 |
| kJ | 6 | 6 | 3 | — | — | — | — | — | — | 1 | — | 3 | 5 | 11 | 1 | 2 | 1 | 5 | — | — | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ESE 3 | ESE 2 | SW 3 | SW 4 | WNW 3 | SW 5 | SW 6 | SSE 3 | NW 5 | SW 9 | — | — | — | NW 4 | WSW 4 | NW 4 | SW 6 | SW 5 | SW 5 | SW 6 | WSW 7 |
| kJ | 2 | 1 | 5 | 20 | 1 | 84 | 91 | 2 | 21 | 91 | — | — | — | 14 | 10 | 6 | 16 | 35 | 42 | 149 | 211 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 303 | 189 | 189 | 200 | 303 | 143 | 103 | 0 | 120 | 3 | 3 | 3 | 0 | 0 | 301 | 315 | 314 | 125 | 0 | 448 | 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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