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Surf Forecasts:

Trefor surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 5 am Thursday 15 Jan 2026 GMT
Forecast update in hr  min  s Forecast update imminent
Trefor surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Trefor sea temperature is
7.9° C
 (Which is slightly cooler than normal)

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 Thursday (Jan 15) at 12PM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.3m and 4s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Trefor in the next 12 days are 1.6m 7s and forecast to arrive on Tuesday (Jan 20) at 12PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Friday (Jan 16) at 12PM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)12PM (Thu 15th Jan)3ft (0.9m) 8s
Best Surf12PM (Thu 15th Jan)3ft (0.9m) 8s
Most Powerful12PM (Tue 20th Jan)5ft (1.6m) 7s

Table - best surf conditions forecast for Trefor over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Light rain (total 6mm), mostly falling on Thu afternoon. Mild temperatures (max 9°C on Sat afternoon, min 6°C on Thu night). Winds increasing (calm on Thu afternoon, fresh winds from the SSE by Fri morning).

Days 3-6 Weather Summary Some drizzle, heaviest during Sun night. Mild temperatures (max 9°C on Tue morning, min 6°C on Mon afternoon). Winds decreasing (fresh winds from the SSE on Mon night, light winds from the SE by Tue night).

Thursday
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.2
SW
0.9
SW
0.6
SW
0.5
SW
1.7
SSW
1.2
SW
1
SW
0.8
SSW
0.4
SW
0.4
SW
0.5
SW
0.3
SW
1.4
SW
0.8
SW
0.1
SW
1.2
SW
1.1
SW
0.7
SW
0.4
SW
0.4
SW
0.3
SW
Period(s) (?)8988788687676616777777
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1921124333257177122511413187049111471365618177
Wind
(km/h)
10
SW
5
S
15
SSE
25
SSE
35
SSE
25
SE
15
SE
20
SSE
20
SE
15
SSE
10
S
20
SSE
15
W
15
S
35
SSE
25
SSE
20
SSE
10
SE
5
SSE
0
SW
10
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		glassoffoffoffoffcross-
off		offoffoffoffoffcross-
on		offoffoffoffoffglassglasson
High Tide
/ height (m)
6:47PM
2.85
7:09AM
3.05
7:30PM
3.00
7:49AM
3.24
8:07PM
3.13
8:24AM
3.43
8:41PM
3.24
8:57AM
3.60
9:13PM
3.32
9:29AM
3.74
9:45PM
3.37
10:01AM
3.83
10:19PM
3.39
Low Tide
/ height (m)
1:25PM
1.07
1:42AM
1.00
2:09PM
0.86
2:22AM
0.80
2:47PM
0.65
2:58AM
0.62
3:24PM
0.46
3:33AM
0.46
4:00PM
0.31
4:07AM
0.36
4:36PM
0.21
4:42AM
0.32
5:13PM
0.18
Thursday
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Sunrise8:22--8:22--8:21--8:19--8:18--8:18--8:17--
Sunset-4:30--4:31--4:32--4:35--4:37--4:37--4:39-
part cloud
rain showers
rain showers
rain showers
light rain
part cloud
clear
part cloud
clear
clear
part cloud
light rain
part cloud
part cloud
part cloud
cloud
part cloud
cloud
part cloud
cloud
cloud
Rain (mm)
-1212------1---------
Temp. °C777887897777777999888
Feels °C (?)35100034334332-1346665
  • 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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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.

View detailed surf forecast for Trefor at:
surf-forecast.com

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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