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Surf Forecasts:

Porth Dinllaen surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 11 pm Friday 30 Jan 2026 GMT
Forecast update in hr  min  s Forecast update imminent
Porth Dinllaen surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Porth Dinllaen sea temperature is
7.6° C
 (Which is slightly cooler than normal)

Best Forecast Surf Conditions for Porth Dinllaen this week:

The surf forecast for Porth Dinllaen over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Jan 31) at 3AM. The primary swell is predicted to be 1.1m and 15s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Porth Dinllaen in the next 12 days are 1.7m 16s and forecast to arrive on Saturday (Jan 31) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 5s period and expected on Thursday (Feb 05) at 3AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Sat 31st Jan)3.5ft (1.1m) 15s
Best Surf 9AM (Sat 31st Jan)5.5ft (1.7m) 16s
Most Powerful 9AM (Sat 31st Jan)5.5ft (1.7m) 16s

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

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

Short Range Forecast Moderate rain (total 17mm), heaviest on Sun morning. Mild temperatures (max 9°C on Sat morning, min 6°C on Sun night). Winds increasing (calm on Sun night, strong winds from the ESE by Mon afternoon).

Days 3-6 Weather Summary Heavy rain (total 29mm), heaviest during Wed night. Very mild (max 10°C on Thu morning, min 6°C on Mon night). Winds increasing (light winds from the SE on Tue afternoon, near gales from the ESE by Wed night).

Saturday
31
Sunday
01
Monday
02
Tuesday
03
Wednesday
04
Thursday
05
Fri
06
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
3
0
1
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.2
WSW
1.7
WSW
1.5
WSW
1
SW
1
WSW
0.5
SW
0.6
SW
0.4
SW
0.4
SW
0.6
SW
0.4
WSW
0.8
WSW
0.9
SW
0.9
SW
0.7
SW
0.6
SW
1.1
SW
1.1
SW
0.6
SW
0.7
SW
1.1
SW
Period(s) (?)16161614129998101816161088111010911
Wave
Graph
(?)Metric surfscale
Energy kJ (?)64913221040407299436027178712330241615069542822137690298
Wind
(km/h)
25
E
10
SSW
25
W
15
SSW
25
W
25
WNW
5
ESE
25
ESE
35
ESE
45
ESE
35
ESE
15
S
15
SE
30
SE
35
ESE
55
ESE
40
SSE
20
E
40
ENE
40
WSW
35
WSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
on		cross-
off		cross-
on		onoffoffcross-
off		cross-
off		cross-
off		cross-
off		offoffoffoffoffcross-
off		cross-
off		crosscross
High Tide
/ height (m)
7:00AM
3.49
7:30PM
3.40
7:50AM
3.78
8:19PM
3.55
8:36AM
4.01
9:02PM
3.63
9:19AM
4.15
9:43PM
3.64
9:59AM
4.16
10:22PM
3.58
10:39AM
4.05
11:01PM
3.47
11:17AM
3.83
Low Tide
/ height (m)
1:48AM
0.57
2:19PM
0.25
2:37AM
0.33
3:07PM
-0.03
3:21AM
0.15
3:51PM
-0.19
4:01AM
0.06
4:32PM
-0.23
4:39AM
0.06
5:10PM
-0.14
5:16AM
0.17
5:47PM
0.06
5:51AM
0.35
Saturday
31
Sunday
01
Monday
02
Tuesday
03
Wednesday
04
Thursday
05
Fri
06
Sunrise-8:03--8:02--8:00--7:58--7:56--7:54--7:52-
Sunset--4:59--5:00--5:02--5:05--5:07--5:08--5:10
light rain
light rain
light rain
part cloud
mod rain
rain showers
part cloud
part cloud
part cloud
heavy rain
light rain
cloud
cloud
part cloud
light rain
mod rain
rain showers
light rain
heavy rain
light rain
part cloud
Rain (mm)
522-71---142---11011123-
Temp. °C899987877789798910101099
Feels °C (?)0446216-1-2-315220045314
  • 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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View detailed surf forecast for Porth Dinllaen at:
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Information about the Porth Dinllaen Surf forecast

The above surf forecast table for Porth Dinllaen provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Porth Dinllaen can be found by selecting the local surf guide option on the grey menu. Our Porth Dinllaen 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 Dinllaen) 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 Dinllaen 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 Dinllaen, camping, hotels and holiday cottages in Lleyn Peninsula, consider staying in Porthmadog which is 29 km (18 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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