Porth Dinllaen surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 11 am Tuesday 09 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
10.4° 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 (Dec 12) at 6AM. The primary swell is predicted to be 1.4m and 13s period with a secondary swell of 0.4m and 4s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Porth Dinllaen in the next 12 days are 4.5m 13s and forecast to arrive on Tuesday (Dec 09) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Fri 12th Dec)4.5ft (1.4m) 13s
Best Surf 6AM (Fri 12th Dec)4.5ft (1.4m) 13s
Most Powerful 6PM (Tue 9th Dec)15ft (4.5m) 13s

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 17mm), heaviest on Thu night. Very mild (max 14°C on Tue morning, min 8°C on Thu night). Winds decreasing (gales from the S on Tue afternoon, calm by Thu night).

Days 3-6 Weather Summary Light rain (total 5mm), mostly falling on Sat night. Very mild (max 11°C on Sat morning, min 10°C on Fri morning). Winds increasing (light winds from the SW on Fri morning, strong winds from the SSW by Sat night).

Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
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 (?)
3
SW
4
SW
3.5
SW
2.5
SW
2.1
WSW
2.2
SW
2.4
SW
2.5
SW
2.1
SSW
1.2
SW
1.5
SW
1.5
WSW
2
SW
2.3
SW
2.3
SW
2.5
SW
2.5
SW
2.5
SW
1.9
SW
1.9
SSW
2.5
SSW
Period(s) (?)101213812789913136778888779
Wave
Graph
(?)Metric surfscale
Energy kJ (?)16684914361276011774367731024739509746138352543617769834769362376992
Wind
(km/h)
50
S
70
S
50
SW
40
SW
35
SW
45
SSW
45
S
40
S
35
S
20
SW
30
SW
35
SW
45
SW
45
SW
45
SSW
50
S
45
S
45
S
45
S
20
NW
10
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
crosscrosscrosscross-
off
cross-
off
cross-
off
cross-
off
crosscrosscrosscrosscross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
oncross-
on
High Tide
/ height (m)
11:18AM
3.76
11:51PM
3.10
12:12PM
3.52
12:50AM
2.84
1:12PM
3.27
2:00AM
2.66
2:21PM
3.07
3:16AM
2.61
3:33PM
2.95
4:24AM
2.67
4:38PM
2.92
5:18AM
2.80
5:32PM
2.96
Low Tide
/ height (m)
6:44PM
0.28
6:54AM
0.73
7:39PM
0.50
7:47AM
0.93
8:37PM
0.70
8:46AM
1.10
9:38PM
0.85
9:52AM
1.19
10:42PM
0.93
11:02AM
1.20
11:42PM
0.94
12:06PM
1.12
12:34AM
0.91
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Sunrise8:18--8:18--8:19--8:21--8:22--8:22--8:23--
Sunset-4:01--4:00--4:00--4:00--4:00--4:00--4:00-
mod rain
rain showers
part cloud
part cloud
cloud
part cloud
part cloud
part cloud
rain showers
cloud
clear
part cloud
part cloud
cloud
light rain
part cloud
part cloud
part cloud
light rain
light rain
part cloud
Rain (mm)
61------10-----5---35-
Temp. °C141211111111101111101010111111101111111010
Feels °C (?)5-2-1232032533222022266
  • 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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