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Trefor Surf Forecast
/ Wales – Lleyn (14 surf breaks) /
Surf Forecasts:
Trefor surfForecast / Wales – Lleyn / UK
12 Day Weather and Surf, issued 6 am Wednesday 27 Aug 2025 BST
Best Forecast Surf Conditions for Trefor this week:
The surf forecast for Trefor over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 31) at 10PM. The primary swell is predicted to be 1.5m and 6s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Trefor in the next 12 days are 2.3m 7s and forecast to arrive on Saturday (Aug 30) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 03) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sun 31st Aug) | 5ft (1.5m) 6s |
| Best Surf | 10PM (Sun 31st Aug) | 5ft (1.5m) 6s |
| Most Powerful | 10PM (Sat 30th Aug) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Trefor over the next 12 days.
Short Range Forecast Heavy rain (total 28mm), heaviest during Wed morning. Very mild (max 17°C on Wed afternoon, min 14°C on Wed morning). Mainly fresh winds. | Days 3-6 Weather Summary Heavy rain (total 23mm), heaviest during Sat morning. Very mild (max 17°C on Sat morning, min 13°C on Sun night). Winds decreasing (strong winds from the SSE on Sat morning, light winds from the WSW by Mon morning). | ||||||||||||||||||||
Wednesday 27 | Thursday 28 | Friday 29 | Saturday 30 | Sunday 31 | Monday 01 | Tuesday 02 | |||||||||||||||
| 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) (?) | 6 | 5 | 7 | 6 | 5 | 5 | 5 | 5 | 6 | 4 | 7 | 7 | 7 | 6 | 6 | 6 | 5 | 7 | 7 | 7 | 6 |
Wave (?)Graph  | |||||||||||||||||||||
| Energy (?) | 210 | 0 | 215 | 116 | 0 | 0 | 0 | 11 | 49 | 0 | 422 | 473 | 373 | 0 | 122 | 110 | 0 | 99 | 35 | 25 | 14 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- on | cross- off | cross | off | cross | cross | cross- off | cross- off | off | off | on | cross- on | cross- on | cross- on | off |
High Tide / height (m) | 11:46AM 3.42 | 12:02AM 3.63 | 12:19PM 3.28 | 12:36AM 3.37 | 12:52PM 3.08 | 1:11AM 3.07 | 1:28PM 2.86 | 1:51AM 2.77 | 2:14PM 2.62 | 2:48AM 2.50 | 3:33PM 2.43 | 4:38AM 2.35 | 5:39PM 2.46 | ||||||||
Low Tide / height (m) | 6:33PM 0.46 | 6:58AM 0.52 | 7:03PM 0.67 | 7:27AM 0.79 | 7:37PM 0.90 | 8:01AM 1.06 | 8:17PM 1.15 | 8:44AM 1.31 | 9:13PM 1.39 | 9:50AM 1.50 | 10:42PM 1.52 | 11:31AM 1.53 | 12:30AM 1.43 | ||||||||
Wednesday 27 | Thursday 28 | Friday 29 | Saturday 30 | Sunday 31 | Monday 01 | Tuesday 02 | |||||||||||||||
| Sunrise | 6:18 | - | - | 6:18 | - | - | 6:20 | - | - | 6:22 | - | - | 6:24 | - | - | 6:26 | - | - | 6:28 | - | - |
| Sunset | - | 8:19 | - | - | 8:16 | - | - | 8:14 | - | - | 8:12 | - | - | 8:09 | - | - | 8:07 | - | - | 8:05 | - |
 | |  |  | | |  | |  |  | |  |  | | | | |  | | | | |
Rain (mm) | 9 | 1 | 6 | 4 | 3 | 4 | - | 1 | - | 6 | 4 | - | - | - | 4 | 3 | 3 | 3 | 4 | - | 1 |
| Temp. °C | 16 | 17 | 15 | 15 | 15 | 14 | 16 | 16 | 16 | 17 | 17 | 16 | 16 | 16 | 14 | 15 | 15 | 14 | 15 | 15 | 14 |
| Feels °C (?) | 11 | 12 | 11 | 12 | 11 | 11 | 14 | 13 | 14 | 10 | 12 | 8 | 10 | 11 | 11 | 14 | 12 | 12 | 12 | 12 | 12 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Wales - Lleyn
The wind is still offshore at Trefor (fresh winds from the S at Caernarfon Airport 13 km from Trefor). 1.3m 4s local chop from the S with a 0.4m 9s swell from the WSW. 2 swells combining to make bigger set waves.
1 h 43 min ago
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Trefor 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 Trefor Surf forecast
The above surf forecast table for Trefor provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Trefor can be found by selecting the local surf guide option on the grey menu. Our Trefor 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 (Trefor) 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 Trefor 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 Trefor, camping, hotels and holiday cottages in Lleyn Peninsula, consider staying in Porthmadog which is 21 km (13 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 29 km (18 miles) away, Bangor, Holyhead and Llandudno.
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