Porth Dinllaen surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 5 pm Sunday 11 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
8.7° 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 Friday (Jan 16) at 12PM. The primary swell is predicted to be 1.0m and 8s 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 3.5m 10s and forecast to arrive on Sunday (Jan 11) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 5s period and expected on Sunday (Jan 18) at 3PM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)12PM (Fri 16th Jan)3.5ft (1.0m) 8s
Best Surf12PM (Fri 16th Jan)3.5ft (1.0m) 8s
Most Powerful 9PM (Sun 11th Jan)11ft (3.5m) 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 Moderate rain (total 19mm), heaviest on Sun afternoon. Very mild (max 11°C on Sun afternoon, min 7°C on Tue morning). Winds decreasing (gales from the S on Sun afternoon, moderate winds from the W by Tue night).

Days 3-6 Weather Summary Moderate rain (total 16mm), heaviest on Wed night. Mild temperatures (max 9°C on Wed night, min 6°C on Fri morning). Winds decreasing (near gales from the S on Wed night, calm by Sat morning).

Sun
11
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
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 (?)
2.3
SSW
3
SW
2.2
SW
1.9
SW
1.6
SW
1.1
SW
0.9
SW
0.7
SW
0.5
SW
0.4
SW
0.2
WSW
0.9
WSW
1.1
SW
0.6
SW
0.6
SW
0.4
WSW
0.4
WSW
0.5
SW
0.4
SW
0.4
SW
0.4
SW
Period(s) (?)81011111111111010109699817169887
Wave
Graph
(?)Metric surfscale
Energy kJ (?)7531729106089862929318794473486719067541139439252214
Wind
(km/h)
55
S
55
SW
35
SSW
35
SSW
35
SSW
35
NW
30
NW
25
WNW
25
SW
45
S
30
SW
20
SSE
10
NW
20
W
20
SSE
15
E
15
NE
0
NNE
20
SSE
40
SSE
50
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
crosscross-
off
cross-
off
cross-
off
ononcross-
on
crosscross-
off
crosscross-
off
oncross-
on
offcross-
off
crossglassoffcross-
off
off
High Tide
/ height (m)
3:11AM
2.61
3:38PM
2.71
4:24AM
2.61
4:51PM
2.67
5:28AM
2.71
5:54PM
2.74
6:22AM
2.87
6:46PM
2.86
7:08AM
3.06
7:28PM
3.01
7:47AM
3.26
8:05PM
3.14
8:22AM
3.45
Low Tide
/ height (m)
9:25PM
1.14
9:45AM
1.35
10:33PM
1.28
11:10AM
1.38
11:50PM
1.29
12:28PM
1.27
12:53AM
1.18
1:23PM
1.09
1:40AM
1.01
2:07PM
0.87
2:20AM
0.82
2:46PM
0.66
2:56AM
0.63
Sun
11
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunrise--8:26--8:25--8:23--8:23--8:22--8:22--8:21
Sunset4:24--4:25--4:28--4:29--4:30--4:31--4:34--
mod rain
light rain
light rain
rain showers
rain showers
rain showers
clear
clear
part cloud
light rain
rain showers
light rain
mod rain
part cloud
cloud
cloud
part cloud
part cloud
cloud
light rain
light rain
Rain (mm)
642214---1717------12
Temp. °C11111010107778898776777888
Feels °C (?)-10323-1-1-1-1-22440132611-5
  • 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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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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