Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Trefor surfForecast / Wales – Lleyn / UK
48hr Weather and Surf, issued 11 pm Saturday 20 Dec 2025 GMTForecast 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
10.1° C
(Which is normal for this time of year)How big are the waves at Trefor today?
The current surf forecast for Trefor at 2AM is: 1.7m 10s primary swell from a South-southwest direction and 0.4m 16s secondary swell from a Southwest direction, 0.1m 16s secondary swell from a Southwest direction (forecast issued at 11:00pm December 20). The wind direction is predicted to be offshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Dec) | 3.5ft (1.1m) | 10s |
| Afternoon (21 Dec) | 2.5ft (0.8m) | 9s |
| Evening (21 Dec) | 2ft (0.6m) | 9s |
Table - waves today at Trefor. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sunday 21 | Monday 22 | Tuesday 23 | ||||||||||||||||||||||
| 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 11 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 9 | 9 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 505 | 406 | 622 | 353 | 217 | 125 | 99 | 78 | 62 | 47 | 36 | 35 | 24 | 17 | 16 | 10 | 10 | 10 | 9 | 6 | 5 | 3 | 2 | 2 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | off | cross- off | cross- off | cross | cross | cross | cross- on | cross- off | cross | cross- off | cross- off | glass | cross | glass | glass | glass | cross- on | cross- on | cross- on | cross- on | cross- on |
High Tide / height (m) | 8:53PM 3.28 | 9:09AM 3.53 | 9:27PM 3.27 | 9:43AM 3.57 | 10:00PM 3.22 | 10:18AM 3.57 | ||||||||||||||||||
Low Tide / height (m) | 3:49AM 0.59 | 4:15PM 0.48 | 4:25AM 0.57 | 4:54PM 0.47 | 5:01AM 0.59 | 5:33PM 0.50 | ||||||||||||||||||
Sunday 21 | Monday 22 | Tuesday 23 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 8:27 | - | - | - | - | - | - | - | 8:29 | - | - | - | - | - | - | - | 8:29 | - | - | - |
| Sunset | - | - | - | - | - | - | 4:01 | - | - | - | - | - | - | - | 4:01 | - | - | - | - | - | - | - | 4:02 | - |
 |  |  |  |  | | | | | | | |  | | |  | | | | | | | | | |
Rain (mm) | - | - | 1 | 1 | - | - | - | - | 2 | 1 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 8 | 9 | 9 | 9 | 9 | 10 | 10 | 9 | 9 | 9 | 11 | 10 | 10 | 11 | 11 | 10 | 10 | 9 | 9 | 10 | 8 | 9 | 8 | 9 |
| Feels °C (?) | 0 | 0 | 3 | 5 | 6 | 7 | 7 | 6 | 6 | 5 | 7 | 7 | 8 | 9 | 10 | 8 | 9 | 8 | 8 | 8 | 4 | 4 | 3 | 5 |
- 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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