Porth Dinllaen surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 5 am Friday 19 Dec 2025 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
10.2° C
(Which is normal for this time of year)


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 Sunday (Dec 21) at 6AM. The primary swell is predicted to be 1.1m and 10s period with a secondary swell of 0.4m and 16s. 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 1.9m 10s and forecast to arrive on Sunday (Dec 21) at 12AM. 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 5s period and expected on Saturday (Dec 20) at 9PM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Sun 21st Dec)3.5ft (1.1m) 10s
Best Surf 6AM (Sun 21st Dec)3.5ft (1.1m) 10s
Most Powerful12AM (Sun 21st Dec)6ft (1.9m) 10s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 9mm), mostly falling on Sat night. Very mild (max 10°C on Fri morning, min 8°C on Sat night). Winds decreasing (strong winds from the SE on Sat afternoon, calm by Sun afternoon).

Days 3-6 Weather Summary Mostly dry. Mild temperatures (max 9°C on Mon morning, min 4°C on Wed night). Winds decreasing (fresh winds from the SSE on Mon afternoon, light winds from the ENE by Wed night).

Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
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 (?)
2.4
WSW
2
WSW
1.6
SW
1.4
SW
1.5
SW
1.9
SSW
1
SW
0.8
SW
0.7
SW
0.5
SW
0.4
SW
0.4
SW
0.6
SW
0.4
SW
0.4
SW
0.4
SW
0.3
SW
0.2
WSW
0.1
SW
0.1
SW
0.1
SW
Period(s) (?)8768910999888789998988
Wave
Graph
(?)Metric surfscale
Energy kJ (?)723342154221328726163957635241532152820127332
Wind
(km/h)
40
WSW
35
SW
35
S
45
SSE
45
SE
40
SSE
20
E
20
E
10
SE
20
SE
30
SSE
20
SE
20
ESE
15
ENE
15
ENE
20
ENE
15
ENE
10
ENE
10
ENE
10
ENE
10
E
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscrosscross-
off
offoffoffcross-
off
cross-
off
offoffoffoffcross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
High Tide
/ height (m)
8:17PM
3.28
8:33AM
3.48
8:52PM
3.30
9:07AM
3.55
9:25PM
3.28
9:42AM
3.58
9:59PM
3.24
10:16AM
3.58
10:34PM
3.17
10:53AM
3.55
11:12PM
3.08
11:32AM
3.49
11:56PM
2.99
Low Tide
/ height (m)
2:59PM
0.61
3:11AM
0.65
3:36PM
0.53
3:47AM
0.60
4:14PM
0.49
4:23AM
0.58
4:52PM
0.49
4:59AM
0.60
5:32PM
0.52
5:37AM
0.65
6:12PM
0.57
6:16AM
0.75
6:55PM
0.63
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Sunrise8:26--8:27--8:27--8:29--8:29--8:30--8:30--
Sunset-4:01--4:01--4:02--4:02--4:04--4:04--4:05-
part cloud
clear
part cloud
clear
part cloud
rain showers
cloud
light rain
light rain
cloud
cloud
clear
part cloud
clear
cloud
cloud
clear
clear
clear
clear
clear
Rain (mm)
-----5-31------------
Temp. °C101010999999998889775456
Feels °C (?)123-1-1-1345421444221012
  • 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 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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