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Surf Forecasts:

Porth Dinllaen surfForecast / Wales – Lleyn / UK

information circle12 Day Weather and Surf, issued 11 am Saturday 17 Jan 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
8.0° C
 (Which is slightly cooler than normal)

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 (Jan 23) at 6PM. The primary swell is predicted to be 1.6m and 9s period. 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 2.5m 8s and forecast to arrive on Friday (Jan 23) at 12AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Wednesday (Jan 21) at 12PM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Fri 23rd Jan)5ft (1.6m) 9s
Best Surf 6PM (Fri 23rd Jan)5ft (1.6m) 9s
Most Powerful12AM (Fri 23rd Jan)8ft (2.5m) 8s

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 Mostly dry. Mild temperatures (max 9°C on Sat afternoon, min 7°C on Sat morning). Winds increasing (light winds from the SE on Sun night, fresh winds from the S by Mon night).

Days 3-6 Weather Summary Moderate rain (total 12mm), heaviest on Thu night. Very mild (max 10°C on Tue afternoon, min 6°C on Thu night). Winds increasing (light winds from the SSW on Thu morning, near gales from the SE by Thu night).

Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1
SSW
0.9
SW
0.7
SW
0.6
SSW
0.4
SW
0.4
SW
0.3
SW
0.1
W
0.2
WSW
0.9
SW
0.1
SW
1.3
SW
1.6
SSW
1.7
SSW
1.9
SSW
1.1
SW
1.1
SW
2.5
WSW
2.2
WSW
1.7
SW
1.3
SW
Period(s) (?)887667418166169968868769
Wave
Graph
(?)Metric surfscale
Energy kJ (?)13691502615113725461030044322743014269926516191266
Wind
(km/h)
25
SE
20
SE
15
SE
10
SE
15
SE
15
S
10
SE
10
SE
30
SSE
35
SE
35
SE
35
SE
30
SE
30
SSE
35
S
15
SSW
35
SSE
55
SE
30
WSW
25
S
10
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffoffoffoffcross-
off		offoffoffoffoffoffoffoffcross-
off		cross-
off		cross-
off		offcrosscross-
off		cross-
off
High Tide
/ height (m)
8:05PM
3.14
8:22AM
3.45
8:39PM
3.25
8:55AM
3.62
9:11PM
3.33
9:27AM
3.75
9:44PM
3.38
10:00AM
3.84
10:18PM
3.41
10:34AM
3.87
10:54PM
3.39
11:11AM
3.83
11:34PM
3.33
Low Tide
/ height (m)
2:46PM
0.66
2:56AM
0.63
3:23PM
0.47
3:31AM
0.47
3:59PM
0.32
4:06AM
0.37
4:35PM
0.23
4:41AM
0.33
5:11PM
0.19
5:16AM
0.35
5:48PM
0.22
5:52AM
0.45
6:26PM
0.31
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
Sunrise8:22--8:21--8:19--8:18--8:17--8:15--8:15--
Sunset-4:34--4:36--4:37--4:38--4:40--4:43--4:45-
clear
clear
clear
cloud
cloud
part cloud
cloud
part cloud
part cloud
clear
cloud
rain showers
clear
cloud
rain showers
clear
part cloud
mod rain
part cloud
rain showers
clear
Rain (mm)
-----------2--4--6-2-
Temp. °C89878888891010999888765
Feels °C (?)24334456413322210-30-10
  • 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:
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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