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Surf Forecasts:

Porth Dinllaen surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 5 pm Thursday 12 Mar 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
8.5° C
 (Which is slightly warmer than usual)

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 Wednesday (Mar 18) at 3AM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.4m and 11s. 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 4.0m 10s and forecast to arrive on Friday (Mar 13) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Sunday (Mar 15) at 6AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Wed 18th Mar)3.5ft (1.1m) 8s
Best Surf 3AM (Wed 18th Mar)3.5ft (1.1m) 8s
Most Powerful 6AM (Fri 13th Mar)13ft (4.0m) 10s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast Moderate rain (total 18mm), heaviest on Fri afternoon. Very mild (max 11°C on Thu afternoon, min 4°C on Thu night). Winds decreasing (gales from the SW on Thu afternoon, light winds from the W by Sat night).

Days 3-6 Weather Summary Light rain (total 3mm), mostly falling on Sun afternoon. Very mild (max 12°C on Wed morning, min 5°C on Sun night). Winds decreasing (strong winds from the S on Mon night, light winds from the S by Wed morning).

Thu
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
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
See all maps
Wave Height (m) & direction (?)
4
SW
3
WSW
3.5
WSW
2.2
WSW
1
SW
0.6
SW
0.8
SW
0.8
WSW
1.6
SW
1.5
WSW
1.9
W
1.7
WSW
2.2
SW
2.2
SW
2.5
SW
2.2
SW
1.4
SW
0.8
SW
0.7
SW
0.5
SW
0.4
SW
Period(s) (?)101010799856676788888887
Wave
Graph
(?)Metric surfscale
Energy kJ (?)32211515199751315959802918715830920452154578465527386552814
Wind
(km/h)
65
SW
55
WSW
60
WSW
40
WSW
35
NW
20
WNW
25
WSW
15
W
35
SW
35
W
40
W
35
SW
45
SSW
45
S
50
S
40
S
25
SSE
10
SE
10
NNW
5
SE
5
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
on		cross-
on		crossoncross-
on		cross-
on		cross-
on		crosscross-
on		cross-
on		crosscross-
off		cross-
off		cross-
off		cross-
off		cross-
off		offonoffcross-
off
High Tide
/ height (m)
4:06AM
2.41
5:12PM
2.37
5:41AM
2.61
6:14PM
2.58
6:28AM
2.90
6:51PM
2.83
7:01AM
3.21
7:22PM
3.09
7:31AM
3.53
7:52PM
3.36
8:02AM
3.82
8:23PM
3.61
8:35AM
4.06
Low Tide
/ height (m)
9:51PM
1.62
11:06AM
1.51
11:40PM
1.48
12:27PM
1.25
12:42AM
1.19
1:15PM
0.91
1:25AM
0.87
1:53PM
0.56
2:02AM
0.57
2:29PM
0.24
2:38AM
0.31
3:04PM
-0.01
3:14AM
0.12
Thu
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Sunrise--6:37--6:35--6:33--6:31--6:28--6:26--6:24
Sunset6:15--6:16--6:19--6:21--6:22--6:24--6:25--
light rain
light rain
light rain
light rain
rain showers
part cloud
light rain
light rain
rain showers
light rain
part cloud
light rain
light rain
cloud
cloud
cloud
part cloud
part cloud
part cloud
clear
clear
Rain (mm)
42252-1111-11--------
Temp. °C11655777798789910111112121210
Feels °C (?)-2-4-9-502021-1-10011271010108
  • 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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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Porth Dinllaen surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Porth Dinllaen at:
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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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