Surf Forecasts:
Porth Ceriad surf forecast from 12 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 1AM (local time) - 3.5ft (1.1m), 5s period, SW swell with glassy winds.
- Most powerful swell: Tuesday 18 Aug, 1PM (local time) - 5ft (1.6m), 6s period, SW swell with 161 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 1AM (local time) - 3.5ft (1.1m), 5s 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 Tuesday (Aug 18) at 1AM. The primary swell is predicted to be 1.1m and 5s period. 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 1.6m 6s and forecast to arrive on Tuesday (Aug 18) at 1PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Saturday (Aug 15) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Tue 18th Aug) | 3.5ft (1.1m) 5s |
| Best Surf | 1AM (Tue 18th Aug) | 3.5ft (1.1m) 5s |
| Most Powerful | 1PM (Tue 18th Aug) | 5ft (1.6m) 6s |
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 in store for our local patch.
Honestly, it’s a pretty bleak stretch ahead. We’re looking at a solid run of days with barely a ripple. The first real chance of anything worth paddling out for doesn’t show up until Saturday the 22nd of August, and even then it’s nothing to write home about. Before that, it’s a long, frustrating wait of over a week with almost no surf to speak of. The wind and swell just aren’t lining up.
Porth Ceriad is the only spot on the cards, and it’s a beginner-friendly, fairly consistent break that’s wide open to the southwest. The first glimmer of hope comes on the morning of Saturday the 22nd. The swell is a tiny 3 ft from the SW with a short, weak period of 4 seconds. The combined energy is a paltry 43 (weak energy), but the wind is glassy. That’s the only way it’s rideable. It’s going to be small and a bit gutless, but clean. The afternoon picks up a touch to 3 ft from the SW, period up to 6 seconds, and the energy climbs to 121 (moderate wave energy). The wind is a light cross-offshore, keeping it clean. It’s still just ordinary, but it’s the best we’ve got.
The following morning, Sunday the 23rd, is a write-off with a risk of thunderstorms and a cross-onshore breeze messing up 2 ft SW swell. The afternoon cleans up with a light cross-offshore wind, but the swell drops to 2 ft from the WSW, with energy falling to 42 (weak energy). It’s surfable, but barely.
The standout, if you can call it that, is the Saturday afternoon session. A clean 3 ft is going to be the most rideable wave in this whole forecast. The water temperature is about average for the time of year, which is to be expected.
For the rest of the window, there’s nothing. The later days see a spike in swell but with howling winds that ruin any chance of a decent wave. A 8 ft NW swell on Thursday the 20th has a big energy reading of 583 (moderate wave energy), but it’s blown out by a strong cross-offshore breeze. It’s just not for us.
So, if you’re desperate, mark your calendar for Saturday the 22nd. Otherwise, it’s a long wait.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Wed afternoon, min 16°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Mon morning. Very mild (max 16°C on Fri night, min 13°C on Sat night). Winds decreasing (fresh winds from the N on Sat morning, calm by Sun night). | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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) | WSW 10 | WSW 10 | SW 9 | SW 8 | SW 8 | SW 5 | SW 5 | SW 5 | SW 7 | WSW 7 | WSW 7 | SW 7 | SW 7 | W 7 | W 7 | W 7 | W 7 | SW 5 | SW 6 | SW 6 | WSW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 9 | 21 | 17 | 14 | 22 | 11 | 3 | 7 | 5 | 5 | 2 | 2 | 1 | 1 | 1 | 1 | 61 | 129 | 131 | 118 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | on | glassy | cross-on | on | cross-off | off | off | off | cross-off | off | off | cross-off | glassy | cross-on | cross-off | glassy | on | cross-on | cross |
High Tide | 8:26AM4.13m | 8:47PM4.64m | 9:12AM4.31m | 9:31PM4.85m | 9:55AM4.39m | 10:13PM4.92m | 10:36AM4.37m | 10:55PM4.81m | 11:16AM4.24m | 11:35PM4.56m | 11:55AM4.03m | 00:15AM4.20m | 12:35PM3.75m | 00:56AM3.78m | |||||||
Low Tide | 3:43PM0.31m | 4:13AM-0.07m | 4:24PM0.16m | 4:55AM-0.16m | 5:03PM0.12m | 5:34AM-0.10m | 5:40PM0.20m | 6:11AM0.09m | 6:16PM0.37m | 6:46AM0.37m | 6:49PM0.61m | 7:18AM0.70m | 7:22PM0.88m | ||||||||
 |  |  | |  |  | | | | | | | | | |  | | | | | | |
 | 5:52 | — | — | 5:54 | — | — | 5:56 | — | — | 5:58 | — | — | 6:00 | — | — | 6:01 | — | — | 6:03 | — | — |
 | — | 8:51 | — | — | 8:49 | — | — | 8:46 | — | — | 8:45 | — | — | 8:43 | — | — | 8:40 | — | — | 8:38 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | — | — | — | 1 | — |
Temp °C | 24 | 26 | 25 | 21 | 21 | 18 | 18 | 18 | 16 | 14 | 15 | 15 | 15 | 16 | 16 | 14 | 15 | 15 | 17 | 17 | 18 |
Feels °C | 23 | 24 | 24 | 21 | 21 | 18 | 18 | 15 | 13 | 8 | 9 | 10 | 11 | 13 | 13 | 12 | 13 | 15 | 14 | 12 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 10 | WSW 10 | SW 9 | SW 8 | SW 8 | SW 5 | SW 5 | SW 5 | SW 7 | WSW 7 | WSW 7 | SW 7 | SW 7 | W 7 | NNW 4 | — | — | — | — | W 17 | — |
| kJ | 10 | 9 | 21 | 17 | 14 | 22 | 11 | 3 | 7 | 5 | 5 | 2 | 2 | 1 | 4 | — | — | — | — | 5 | — |
Swell 2 Height (m) Direction Period (s) | SW 6 | SW 6 | — | — | SW 10 | SW 9 | SW 8 | SW 8 | — | — | — | — | — | — | W 7 | W 7 | W 7 | — | — | — | — |
| kJ | 1 | 1 | — | — | 4 | 3 | 3 | 2 | — | — | — | — | — | — | 1 | 1 | 1 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | W 6 | — | — | — | — | SW 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 1 | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSE 2 | — | — | — | — | WSW 4 | NW 4 | NW 4 | N 4 | NNW 5 | NNW 5 | N 4 | NNW 5 | NNW 4 | — | — | SW 2 | SW 5 | SW 6 | SW 6 | WSW 5 |
| kJ | 1 | — | — | — | — | 16 | 3 | 12 | 9 | 40 | 54 | 15 | 12 | 13 | — | — | 1 | 61 | 129 | 131 | 118 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 180 | 113 | 113 | 135 | 303 | 138 | 125 | 125 | 277 | 325 | 535 | 303 | 303 | 319 | 307 | 312 | 308 | 0 | 60 | 296 | 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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