Surf Forecasts:
Porth Dinllaen surf forecast from 17 Aug 2026:
- Most powerful swell: Wednesday 19 Aug, 7PM (local time) - 4.5ft (1.4m), 6s period, SW swell with 147 kJ wave energy.
Best Forecast Surf Conditions for Porth Dinllaen this week:
The most powerful waves expected at Porth Dinllaen in the next 16 days are 1.4m 6s and forecast to arrive on Wednesday (Aug 19) at 7PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Monday (Aug 17) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 19th Aug) | 4.5ft (1.4m) 6s |
Table - best surf conditions forecast for Porth Dinllaen over the next 16 days.
Short Range ForecastLight rain (total 6mm), mostly falling on Mon night. Very mild (max 18°C on Mon night, min 14°C on Tue night). Winds increasing (light winds from the WSW on Mon afternoon, fresh winds from the WSW by Wed morning). | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Wed night. Very mild (max 16°C on Wed night, min 13°C on Thu night). Winds decreasing (fresh winds from the N on Thu morning, light winds from the NNE by Sat morning). | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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 5 | SW 5 | SW 5 | SW 6 | SW 6 | WSW 4 | WSW 5 | SW 6 | WSW 6 | NW 5 | NNW 4 | NW 5 | W 4 | N 4 | W 16 | NNW 5 | NW 4 | SW 15 | SW 14 | NW 4 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 9 | 6 | 26 | 25 | 16 | 18 | 90 | 114 | 111 | 30 | 20 | 12 | 3 | 5 | 7 | 8 | 8 | 8 | 8 | 7 | 8 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross | cross-on | cross | cross-on | cross | cross-off | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | on | cross-on | glassy |
High Tide | 12:19PM3.43m | 00:38AM3.64m | 12:59PM3.22m | 1:20AM3.29m | 1:42PM2.98m | 2:07AM2.93m | 2:34PM2.73m | 3:10AM2.62m | 3:50PM2.55m | 4:45AM2.46m | 5:31PM2.54m | 6:18AM2.51m | 6:48PM2.70m | ||||||||
Low Tide | 7:05AM0.20m | 7:12PM0.46m | 7:41AM0.54m | 7:50PM0.74m | 8:18AM0.89m | 8:31PM1.03m | 9:00AM1.20m | 9:24PM1.29m | 9:58AM1.44m | 10:47PM1.47m | 11:35AM1.54m | 00:36AM1.43m | 1:07PM1.40m | 1:47AM1.21m | |||||||
 |  |  | | |  | |  | |  |  |  | | |  | | | | | | | |
 | 6:01 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — |
 | — | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | — | 8:30 | — | — | 8:28 | — |
mm | — | — | 3 | — | — | 1 | — | 2 | 4 | 1 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 17 | 18 | 16 | 17 | 18 | 16 | 16 | 16 | 16 | 16 | 14 | 14 | 16 | 14 | 16 | 16 | 14 | 14 | 15 | 16 |
Feels °C | 15 | 14 | 16 | 14 | 14 | 14 | 10 | 9 | 12 | 10 | 10 | 11 | 10 | 11 | 9 | 11 | 11 | 10 | 11 | 13 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 5 | SW 5 | — | SW 6 | NW 4 | — | — | — | W 16 | SW 6 | SW 6 | WSW 6 | W 4 | W 3 | SW 13 | SW 15 | SW 15 | SW 15 | SW 14 | NW 4 | — |
| kJ | 9 | 6 | — | 25 | 4 | — | — | — | 5 | 30 | 10 | 3 | 3 | 1 | 7 | 8 | 8 | 8 | 8 | 3 | — |
Swell 2 Height (m) Direction Period (s) | — | WNW 3 | — | W 16 | W 16 | — | — | — | — | W 15 | W 14 | SW 14 | NNW 4 | SW 5 | — | W 8 | SW 12 | W 12 | — | SW 14 | SW 14 |
| kJ | — | 1 | — | 5 | 5 | — | — | — | — | 4 | 4 | 8 | 2 | 1 | — | 1 | 6 | 3 | — | 7 | 8 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SW 5 | W 13 | W 16 | — | — | W 12 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 5 | — | — | 3 | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 3 | — | SW 5 | NW 4 | SW 6 | WSW 4 | WSW 5 | SW 6 | WSW 6 | NW 5 | NNW 4 | NW 5 | — | N 4 | NNW 3 | NNW 5 | NW 4 | NNW 3 | NW 4 | NW 4 | — |
| kJ | 1 | — | 26 | 4 | 16 | 18 | 90 | 114 | 111 | 25 | 20 | 12 | — | 5 | 3 | 8 | 8 | 1 | 3 | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 287 | 320 | 566 | 13 | 476 | 287 | 282 | 282 | 126 | 142 | 308 | 141 | 141 | 309 | 277 | 229 | 193 | 193 | 308 | 310 | 127 |
Best forecast wave conditions in Lleyn Peninsula | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Porth Dinllaen surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Porth Dinllaen Surf forecast
The above surf forecast table for Porth Dinllaen provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Porth Dinllaen can be found by selecting the local surf guide option on the grey menu. Our Porth Dinllaen 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 Dinllaen) 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 Dinllaen 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.
Are you planning a holiday in Lleyn Peninsula? If you are looking for accommodation near Porth Dinllaen, camping, hotels and holiday cottages in Lleyn Peninsula, consider staying in Porthmadog which is 29 km (18 miles) away. Other places in and around Lleyn Peninsula where you can find information about places to rent, and car hire include Anglesey which is 35 km (22 miles) away, Holyhead, Bangor and Llandudno.
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