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Porth Nefyn Surf Forecast
/ Wales – Lleyn (14 surf breaks) /
Surf Forecasts:
Porth Nefyn surfForecast / Wales – Lleyn / UK
12 Day Weather and Surf, issued 11 am Tuesday 02 Dec 2025 GMTForecast update in hr min s Forecast update imminent
Porth Nefyn surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Porth Nefyn sea temperature is
10.8° C
(Which is normal for this time of year)Best Forecast Surf Conditions for Porth Nefyn this week:
The surf forecast for Porth Nefyn over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Dec 02) at 9PM. The primary swell is predicted to be 1.1m and 9s period with a secondary swell of 0.3m and 16s. Another secondary swell of 0.4m and 15s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Porth Nefyn in the next 12 days are 4.5m 13s and forecast to arrive on Tuesday (Dec 09) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Dec 03) at 9PM.
| Wave Type | Time (GMT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 2nd Dec) | 3.5ft (1.1m) 9s |
| Best Surf | 9PM (Tue 2nd Dec) | 3.5ft (1.1m) 9s |
| Most Powerful | 3PM (Tue 9th Dec) | 15ft (4.5m) 13s |
Table - best surf conditions forecast for Porth Nefyn over the next 12 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Heavy rain (total 33mm), heaviest during Wed night. Very mild (max 10°C on Tue morning, min 7°C on Wed night). Winds increasing (light winds from the SSW on Tue night, strong winds from the WNW by Wed night). | Days 3-6 Weather Summary Heavy rain (total 27mm), heaviest during Fri morning. Very mild (max 12°C on Fri afternoon, min 7°C on Fri morning). Winds decreasing (gales from the SE on Fri morning, moderate winds from the SW by Sat night). | ||||||||||||||||||||
Tuesday 02 | Wednesday 03 | Thursday 04 | Friday 05 | Saturday 06 | Sunday 07 | Monday 08 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 10 | 9 | 9 | 18 | 13 | 7 | 8 | 15 | 8 | 9 | 8 | 10 | 12 | 9 | 6 | 6 | 7 | 7 | 7 | 10 | 9 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 424 | 307 | 65 | 31 | 17 | 352 | 306 | 22 | 100 | 32 | 1176 | 1596 | 1299 | 1318 | 292 | 293 | 530 | 434 | 542 | 580 | 1236 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | off | off | cross- off | off | cross | cross | cross- off | off | off | cross- off | cross | cross | cross- off | cross | cross | cross- off | cross- off | off | cross- off |
High Tide / height (m) | 6:04PM 3.60 | 6:35AM 3.57 | 6:55PM 3.80 | 7:22AM 3.82 | 7:44PM 3.93 | 8:07AM 3.99 | 8:32PM 3.95 | 8:53AM 4.07 | 9:21PM 3.85 | 9:40AM 4.06 | 10:09PM 3.66 | 10:28AM 3.95 | 10:59PM 3.39 | ||||||||
Low Tide / height (m) | 12:43PM 0.64 | 1:13AM 0.27 | 1:37PM 0.38 | 2:04AM 0.15 | 2:29PM 0.14 | 2:53AM 0.10 | 3:19PM -0.02 | 3:41AM 0.12 | 4:09PM -0.08 | 4:29AM 0.20 | 5:00PM -0.04 | 5:16AM 0.35 | 5:51PM 0.09 | ||||||||
Tuesday 02 | Wednesday 03 | Thursday 04 | Friday 05 | Saturday 06 | Sunday 07 | Monday 08 | |||||||||||||||
| Sunrise | 8:07 | - | - | 8:10 | - | - | 8:11 | - | - | 8:12 | - | - | 8:14 | - | - | 8:15 | - | - | 8:15 | - | - |
| Sunset | - | 4:05 | - | - | 4:04 | - | - | 4:04 | - | - | 4:02 | - | - | 4:02 | - | - | 4:01 | - | - | 4:01 | - |
 |  |  |  | |  | | | | |  |  | |  | | |  | |  | | | |
Rain (mm) | 1 | 2 | 5 | 1 | 1 | 16 | 2 | 4 | 1 | 5 | 8 | 5 | 2 | - | 4 | 1 | - | 2 | - | 1 | 8 |
| Temp. °C | 10 | 10 | 9 | 10 | 10 | 10 | 8 | 8 | 8 | 8 | 12 | 11 | 11 | 11 | 11 | 12 | 10 | 10 | 11 | 11 | 12 |
| Feels °C (?) | 3 | 4 | 3 | 4 | 3 | 2 | 0 | 0 | 1 | -4 | 3 | 1 | 1 | -1 | 5 | 4 | 0 | 1 | 6 | 6 | 2 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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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 Nefyn 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 Nefyn Surf forecast
The above surf forecast table for Porth Nefyn provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Porth Nefyn can be found by selecting the local surf guide option on the grey menu. Our Porth Nefyn 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 Nefyn) 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 Nefyn 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 Nefyn, camping, hotels and holiday cottages in Lleyn Peninsula, consider staying in Porthmadog which is 27 km (17 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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