Trefor surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 6 am Wednesday 02 Jul 2025 BST
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
16.3° C
(Which is 2.1°C warmer than normal for this time of year)


Best Forecast Surf Conditions for Trefor this week:

The most powerful waves expected at Trefor in the next 12 days are 1.8m 7s and forecast to arrive on Friday (Jul 04) at 10PM. 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 Friday (Jul 04) at 4PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10PM (Fri 4th Jul)6ft (1.8m) 7s

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

Updates in  hr  min  s Forecast update imminent
Wednesday
02
Thursday
03
Friday
04
Saturday
05
Sunday
06
Monday
07
Tuesday
08
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.2
WSW
0.1
W
0.1
SW
0.4
SW
0.1
W
0.1
W
0.7
SW
1.5
SW
1.5
SW
1.1
SW
1.3
SW
1.2
WSW
1.2
NW
0.9
NW
1.3
NW
1.4
NW
0.8
NW
0.2
W
0.3
WNW
0.2
WNW
0.6
SW
0.6
SW
1.1
SW
0.9
SW
0.6
SW
1
SW
0.8
SW
0.6
SW
0.4
SW
0.6
SW
0.4
SW
0.1
NW
0.7
SW
0.1
NW
0.7
SSW
0.4
SW
Period(s) (?)10910588467667556673344456656664445444
Wave
Graph
(?)Metric surfscale
Energy (?)13479110019294118121112741321555423200000043261311610104
Wind
(km/h)
15
NNW
10
NW
10
WNW
10
WSW
20
SW
15
WSW
25
SSW
35
SSW
30
SW
20
SW
25
SSW
30
WSW
35
WNW
30
NW
35
NW
35
NW
25
NW
15
N
15
WNW
15
SSW
10
SW
20
WSW
15
WSW
20
WSW
15
WSW
20
SW
10
SSE
15
S
20
S
15
S
15
SW
20
SSW
10
NW
10
NW
5
NW
5
SSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
oncross-
on
cross-
on
crosscross-
off
crosscross-
off
cross-
off
cross-
off
cross-
off
cross-
off
crosscross-
on
oncross-
on
oncross-
on
oncross-
on
cross-
off
cross-
off
crosscrosscrosscross-
off
cross-
off
offcross-
off
cross-
off
offcross-
off
cross-
off
cross-
on
onglassglass
High Tide
/ height (m)
2:43PM
2.71
3:02AM
3.03
3:45PM
2.63
4:05AM
2.86
4:51PM
2.62
5:11AM
2.77
5:51PM
2.69
6:11AM
2.78
6:44PM
2.80
7:04AM
2.84
7:31PM
2.95
7:51AM
2.95
8:12PM
3.11
8:32AM
3.06
8:51PM
3.28
9:09AM
3.16
9:27PM
3.44
9:45AM
3.25
10:03PM
3.59
10:21AM
3.31
10:39PM
3.71
10:59AM
3.33
11:16PM
3.78
Low Tide
/ height (m)
9:17PM
1.07
10:01AM
0.95
10:09PM
1.22
10:54AM
1.09
11:12PM
1.30
11:55AM
1.16
12:25AM
1.29
1:00PM
1.15
1:32AM
1.18
1:57PM
1.07
2:26AM
1.02
2:45PM
0.93
3:12AM
0.83
3:27PM
0.78
3:54AM
0.65
4:07PM
0.62
4:35AM
0.49
4:46PM
0.50
5:15AM
0.35
5:24PM
0.42
5:54AM
0.26
6:02PM
0.40
Wednesday
02
Thursday
03
Friday
04
Saturday
05
Sunday
06
Monday
07
Tuesday
08
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
Sunrise4:56--4:56--4:58--4:58--4:58--5:00--5:01--5:01--5:03--5:03--5:05--5:07--
Sunset-9:45--9:45--9:45--9:44--9:44--9:43--9:43--9:42--9:40--9:39--9:38--9:37-
clearclearclearpart cloudpart cloudpart cloudpart cloudlight rainlight rainlight rainrain showerslight rainpart cloudlight rainpart cloudclearclearclearpart cloudpart cloudcloudlight rainlight rainlight rainpart cloudpart cloudpart cloudclearpart cloudpart cloudpart cloudclearclearclearclearclear
Rain (mm)
-------23111-1-------112------------
Temp. °C131514131515151415161614141513141514131516161617171817171716171917141616
Feels °C (?)9121311111311812141310810781011111216141416151516161514151718131615

Short Range Forecast: Light rain (total 5mm), mostly falling on Fri night. Very mild (max 15°C on Wed afternoon, min 12°C on Wed night). Winds increasing (calm on Wed night, fresh winds from the SSW by Fri afternoon).

Days 3-6 Weather Summary Light rain (total 4mm), mostly falling on Sat morning. Very mild (max 16°C on Sat morning, min 12°C on Sun night). Winds decreasing (strong winds from the NW on Sun night, light winds from the N by Mon night).

Days 6-9 Weather Summary Light rain (total 4mm), mostly falling on Wed morning. Very mild (max 18°C on Thu afternoon, min 12°C on Tue morning). Wind will be generally light.

Long Range Forecast: Mostly dry. Very mild (max 19°C on Sat afternoon, min 12°C on Sat night). Wind will be generally light.

  • 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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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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