Porth Dinllaen surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 11 am Friday 05 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
10.8° 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 Tuesday (Dec 09) at 12PM. The primary swell is predicted to be 3.5m and 11s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Porth Dinllaen in the next 12 days are 3.5m 11s and forecast to arrive on Tuesday (Dec 09) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 5s period and expected on Tuesday (Dec 09) at 3AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)12PM (Tue 9th Dec)11ft (3.5m) 11s
Best Surf12PM (Tue 9th Dec)11ft (3.5m) 11s
Most Powerful12PM (Tue 9th Dec)11ft (3.5m) 11s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 36mm), heaviest during Fri afternoon. Very mild (max 13°C on Sun afternoon, min 9°C on Fri morning). Winds decreasing (gales from the SSE on Fri afternoon, moderate winds from the S by Sat night).

Days 3-6 Weather Summary Heavy rain (total 28mm), heaviest during Tue night. Very mild (max 13°C on Mon afternoon, min 10°C on Tue night). Mainly strong winds.

Friday
05
Saturday
06
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
2
3
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.5
WSW
2.5
S
2.5
SW
3
WSW
3
WSW
2
WSW
1.2
SW
1.9
SW
1.8
SW
2.1
SW
1.8
SW
1.3
SW
3.5
SW
2.5
SW
2
WSW
2.1
WSW
2.5
WSW
1.7
WSW
1.9
SW
2.5
SW
1.4
SW
Period(s) (?)981012810107117111011121267117911
Wave
Graph
(?)Metric surfscale
Energy kJ (?)489231260211310088102573516984667783502536212412163206746723351094506
Wind
(km/h)
45
SSE
75
SSE
45
SW
45
WSW
50
WSW
30
SW
35
SE
40
SSW
35
SSW
35
SW
35
SSW
25
SSE
20
S
10
SE
45
WNW
30
W
25
W
15
SW
40
S
45
S
50
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
offcross-
off
crosscrosscrossoffcross-
off
cross-
off
crosscross-
off
cross-
off
cross-
off
offoncross-
on
cross-
on
crosscross-
off
cross-
off
cross-
off
High Tide
/ height (m)
8:32PM
3.95
8:53AM
4.07
9:21PM
3.85
9:40AM
4.06
10:09PM
3.66
10:28AM
3.95
10:59PM
3.39
11:18AM
3.76
11:51PM
3.10
12:12PM
3.52
12:50AM
2.84
1:12PM
3.27
2:00AM
2.66
Low Tide
/ height (m)
3:19PM
-0.02
3:41AM
0.12
4:09PM
-0.08
4:29AM
0.20
5:00PM
-0.04
5:16AM
0.35
5:51PM
0.09
6:05AM
0.53
6:44PM
0.28
6:54AM
0.73
7:39PM
0.50
7:47AM
0.93
8:37PM
0.70
Friday
05
Saturday
06
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Sunrise8:12--8:14--8:15--8:15--8:18--8:18--8:19--
Sunset-4:02--4:02--4:01--4:01--4:01--4:00--4:00-
light rain
mod rain
mod rain
rain showers
part cloud
rain showers
mod rain
rain showers
rain showers
cloud
light rain
light rain
light rain
mod rain
heavy rain
light rain
clear
part cloud
cloud
part cloud
light rain
Rain (mm)
11083-1643-2127124----1
Temp. °C91111111111121312121312121210101010101111
Feels °C (?)-1102136635689112345221
  • 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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