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Surf Forecasts:

Porth Dinllaen surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 6 am Sunday 14 Sep 2025 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
16.8° C
 (Which is 1.4°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Porth Dinllaen this week:

The most powerful waves expected at Porth Dinllaen in the next 12 days are 3.5m 10s and forecast to arrive on Monday (Sep 15) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Sunday (Sep 14) at 4PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10AM (Mon 15th Sep)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 
12 DaysHourly
Print Table

Short Range Forecast Heavy rain (total 31mm), heaviest during Tue night. Very mild (max 17°C on Sun afternoon, min 13°C on Mon night). Winds decreasing (near gales from the WSW on Mon morning, moderate winds from the WSW by Tue night).

Days 3-6 Weather Summary Light rain (total 3mm), mostly falling on Wed morning. Very mild (max 17°C on Wed morning, min 14°C on Thu night). Winds decreasing (strong winds from the SW on Wed morning, light winds from the S by Fri afternoon).

Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
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
See all maps
Wave Height (m) & direction (?)
0.4
SW
1.2
SW
3
SW
3.5
WSW
3.5
WSW
2.5
W
1.8
W
1.5
WSW
1.1
SW
2.3
SW
2.3
SW
1.6
SW
1.5
SW
1.6
SW
1.7
WSW
1.1
WSW
0.6
SW
0.4
SW
0.6
SSW
0.6
SW
0.6
SW
Period(s) (?)7781087666887666577668
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1813110602460154359225513569650661221136175246623917222342
Wind
(km/h)
35
S
50
SSE
50
WSW
60
WSW
60
W
50
W
35
W
30
WSW
30
SW
40
SSW
45
SW
45
SW
35
SW
35
SW
35
WSW
15
W
5
S
20
SSE
15
SE
20
SSW
30
SSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		crosscrosscross-
on		cross-
on		cross-
on		cross-
on		crosscross-
off		crosscrosscrosscrosscrosscross-
on		cross-
off		offoffcross-
off		cross-
off
High Tide
/ height (m)
1:55PM
3.12
2:36AM
2.91
3:10PM
2.85
4:11AM
2.64
4:52PM
2.79
6:00AM
2.67
6:23PM
2.98
7:10AM
2.86
7:22PM
3.26
7:55AM
3.08
8:05PM
3.53
8:31AM
3.29
8:42PM
3.74
Low Tide
/ height (m)
9:23PM
0.93
10:03AM
1.21
10:53PM
1.06
11:36AM
1.26
12:26AM
0.94
12:57PM
1.08
1:37AM
0.67
1:57PM
0.80
2:29AM
0.39
2:43PM
0.54
3:12AM
0.17
3:23PM
0.35
3:49AM
0.05
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunrise6:48--6:50--6:52--6:54--6:56--6:56--6:58--
Sunset-7:37--7:35--7:31--7:30--7:27--7:24--7:22-
light rain
rain showers
thunderstorm
light rain
light rain
part cloud
part cloud
part cloud
heavy rain
rain showers
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
part cloud
part cloud
rain showers
Rain (mm)
36312---163----------3
Temp. °C141715141514141615171615151616141517191817
Feels °C (?)79624471111118781010111413161513
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Wales - Lleyn

  1. weather stationWind Update The wind is still cross-off at Porth Dinllaen (fresh winds from the S at Aberdaron 21 km from Porth Dinllaen). 0.7m 7s swell from the SW with a 0.3m 6s windswell from the WSW and a 0.3m 5s windswell from the WNW as well as a 0.3m 4s local chop from the SW. 4 swells combining to make bigger set waves.

    1 hour 32 minutes ago Porth Dinllaen
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21 km away, 1 h 32 min ago

35 km/h
S
0.0
16.8
Air / Water (°C)
Please reload the page to see if there are any updates.

FREE! Surf-Forecast.com widget for your website

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:
surf-forecast.com

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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