Porth Dinllaen surfForecast / Wales – Lleyn / UK

information circle16 Day Weather and Surf, issued 6 pm Tuesday 19 May 2026 BST
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
11.8° C
(Which is slightly warmer than usual)

Best Forecast Surf Conditions for Porth Dinllaen this week:

The most powerful waves expected at Porth Dinllaen in the next 16 days are 2.3m 8s and forecast to arrive on Tuesday (May 19) 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 1.4m 6s period and expected on Thursday (May 21) at 4AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10PM (Tue 19th May)7.5ft (2.3m) 8s

Table - best surf conditions forecast for Porth Dinllaen over the next 16 days.


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Light rain (total 4mm), mostly falling on Wed night. Very mild (max 17°C on Thu night, min 11°C on Tue afternoon). Winds decreasing (strong winds from the SSW on Tue night, light winds from the SE by Thu night).

Days 5-7 Weather Summary

Mostly dry. Very mild (max 17°C on Sun afternoon, min 13°C on Fri night). Wind will be generally light.

Tue
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
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
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.8
SW
7
2.1
SW
8
1.8
SW
6
1.6
SW
6
0.6
WSW
8
1.3
SW
6
1.1
SW
6
0.7
SW
7
0.4
WSW
9
0.8
SW
6
0.8
SW
10
0.5
SW
10
0.4
SW
9
0.4
SW
9
0.3
SW
8
0.3
SW
8
0.3
SW
8
0.2
WSW
8
0.1
W
13
0.1
W
12
0.1
W
12
Wave Graph
Metric surfscale
Energy kJ
317
575
231
206
47
120
94
52
35
49
120
47
31
20
11
10
10
6
3
3
3
Wind (km/h)
40
SSW
35
SW
35
SW
35
SW
25
SSE
30
S
25
SSW
20
SSE
20
S
15
SSW
10
S
10
S
10
SW
10
SSE
10
S
10
SW
10
S
10
S
15
SSW
5
SSE
15
N
cross-off
cross
cross
cross
cross-off
cross-off
cross-off
off
cross-off
cross-off
cross-off
cross-off
cross
off
cross-off
cross
cross-off
cross-off
cross-off
cross-off
cross-on
High Tide
11:17PM3.95m
11:47AM3.57m
00:07AM3.78m
12:42PM3.26m
1:03AM3.55m
1:44PM2.95m
2:08AM3.33m
2:59PM2.73m
3:23AM3.17m
4:24PM2.68m
4:40AM3.11m
5:34PM2.76m
5:45AM3.13m
Low Tide
6:08PM0.30m
6:39AM0.09m
6:59PM0.49m
7:35AM0.25m
7:53PM0.69m
8:35AM0.43m
8:51PM0.88m
9:39AM0.58m
9:55PM1.01m
10:47AM0.67m
11:05PM1.05m
11:54AM0.69m
00:13AM1.01m
12:54PM0.66m
cloud
rain showers
part cloud
clear
rain showers
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:13
5:11
5:09
5:09
5:07
5:07
5:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:15
9:15
9:17
9:19
9:21
9:22
9:23
9:24
1
3
Temp °C
13
12
12
13
13
15
16
17
16
16
15
14
15
15
16
17
16
16
16
16
13
6
4
5
6
8
10
11
15
13
14
13
13
14
14
14
14
13
13
13
13
9
Swell 1
Height (m)
Direction
Period (s)
0.6
WSW
8
0.1
W
15
0.1
W
15
0.7
SW
7
0.4
WSW
9
0.4
SW
10
0.8
SW
10
0.5
SW
10
0.4
SW
9
0.4
SW
9
0.3
SW
8
0.3
SW
8
0.3
SW
8
0.2
WSW
8
0.1
SW
7
0.1
SW
7
0.1
SW
7
Energy kJ
47
5
4
52
35
26
120
47
31
20
11
10
10
6
2
2
2
Swell 2
Height (m)
Direction
Period (s)
0.4
WSW
8
0.1
W
15
0.1
SW
8
0.3
SW
8
0.4
SW
4
0.1
SW
13
0.1
SW
13
0.1
W
14
0.1
W
14
0.1
W
13
0.1
W
13
0.1
W
13
Energy kJ
28
4
2
9
4
7
7
4
4
3
3
3
Swell 3
Height (m)
Direction
Period (s)
0.1
W
12
0.1
W
12
Energy kJ
3
3
Wind waves
Height (m)
Direction
Period (s)
1.8
SW
7
2.1
SW
8
1.8
SW
6
1.6
SW
6
1.3
SW
6
1.3
SW
6
1.1
SW
6
0.2
SSE
2
0.8
SSW
6
0.8
SW
6
Energy kJ
317
575
231
206
116
120
94
1
41
49
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
4
1
1
2
2
1
1
2
1
1
1
1
1
1
1
1
1
1
Distance (km)
328
308
282
343
273
76
169
151
31
149
13
13
13
13
13
127
127
127
127
154
282
Best forecast wave conditions in Lleyn Peninsula
Rating
(10 max)
2
1
1
1
1
Best forecast wave conditions in United Kingdom
Rating
(10 max)
1
1
3
4
4
4
2
3
3
3
2
3
2
1
2
1
2
1
2
2
3
Header Global
Rating
(10 max)
4
5
5
4
4
4
4
5
5
7
5
5
9
6
5
5
4
4
4
4
4
  • 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 16 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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