Cable Bay (Porth Trecastell) Surf Break

Lat Long: 53.22° N 4.51° W

Cable Bay (Porth Trecastell) Surf Forecast and Surf Report

Issued: 12 pm 11 Sep 2026 (local time)

Forecast update in  hr  min

Today's Cable Bay (Porth Trecastell) sea temperature is
16.9°C
1.5° 

Cable Bay (Porth Trecastell) surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Cable Bay (Porth Trecastell) surf forecast from 11 Sep 2026:

  • Most powerful swell: Saturday 12 Sep, 10AM (local time) - 7ft (2.1m), 7s period, SW swell with 391 kJ wave energy.

Best Forecast Surf Conditions for Cable Bay (Porth Trecastell) this week:

The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 2.1m 7s and forecast to arrive on Saturday (Sep 12) at 10AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 16) at 4AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10AM (Sat 12th Sep)7ft (2.1m) 7s

Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.


The Lowdown

Alright folks, Rusty here. Let's have a look at what the next couple of weeks are serving up for us.

Straight up, we’ve got a long, quiet stretch ahead. It’s going to be a real waiting game. There’s no surf on offer at all for the first week and a half, from Friday morning right through to late on Saturday the 19th of September. That's over a week of flat, unrideable conditions. You can leave the boards in the shed.

Looking through the doldrums, we finally get a little flicker of life on Sunday the 20th of September. Cable Bay (Porth Trecastell) is our only real option, and it’s for the morning. It’s not going to set the world on fire, but it’s the best we’ve got in this window. You’ll find some small, clean waves around 4ft from the SSW, with a short period of 5 seconds, so it’ll be a bit weak and soft. The combined swell energy is weak (87). What makes it worth a look is the clean conditions—cross-offshore wind early on, and the water’s a touch warmer than normal at 62°F. It’s a fairly consistent spot though, so you might get a couple of fun ones if you’re keen for a paddle.

Beyond that Sunday, it’s right back to flatness and tiny, useless dribble for the rest of the 16-day window. Honestly, for a stretch this long with so little to offer, this is a pretty normal blank run for the area. The forecasts can change, but right now, there’s not much to get excited about.

Rusty

Short Range Forecast

Light rain (total 8mm), mostly falling on Sat morning. Very mild (max 17°C on Sat afternoon, min 14°C on Fri afternoon). Mainly strong winds.

Days 4-6 Weather Summary

Heavy rain (total 35mm), heaviest during Mon night. Very mild (max 17°C on Mon morning, min 12°C on Tue night). Mainly fresh winds.

Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
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
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
SW
6
0.5
SW
6
0.9
SSW
4
2.1
SW
7
2
SW
7
1.1
SW
6
0.6
SSW
6
0.5
SW
6
0.7
SSW
4
1.1
SW
5
1.6
SSW
6
2
SSW
6
0.8
SSW
6
0.5
SW
5
0.1
SW
5
0.1
S
11
0.4
W
4
1.2
WSW
5
1.5
WSW
6
1.2
SW
6
0.8
SW
7
Wave Graph
Metric surfscale
Energy kJ
34
19
29
391
352
108
26
18
11
62
171
309
39
13
1
2
5
57
129
106
54
Wind (km/h)
20
WNW
10
NW
25
SSW
40
SSW
30
SW
10
SW
10
N
10
SW
20
S
25
SSW
30
SSW
30
SW
20
WNW
15
WNW
25
NW
20
NW
25
SW
35
WSW
30
WNW
25
W
30
WNW
Wind State
cross
cross
cross-on
on
on
on
cross-off
on
cross-on
cross-on
on
on
cross
cross
cross-off
cross
on
on
cross-on
cross-on
cross-on
High Tide
10:06AM4.03m
10:17PM4.51m
10:42AM4.11m
10:54PM4.52m
11:16AM4.11m
11:30PM4.39m
11:50AM4.02m
00:07AM4.16m
12:24PM3.85m
00:44AM3.84m
1:00PM3.60m
1:24AM3.48m
1:40PM3.31m
2:09AM3.11m
Low Tide
4:43PM-0.03m
5:10AM-0.34m
5:22PM-0.06m
5:48AM-0.24m
5:59PM0.01m
6:23AM-0.01m
6:35PM0.19m
6:58AM0.30m
7:12PM0.44m
7:33AM0.66m
7:49PM0.75m
8:09AM1.03m
8:30PM1.08m
part cloud
clear
rain showers
light rain
part cloud
rain showers
cloud
part cloud
part cloud
heavy rain
cloud
heavy rain
part cloud
clear
part cloud
cloud
cloud
rain showers
cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:43
6:45
6:47
6:48
6:50
6:52
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:44
7:42
7:38
7:37
7:35
7:31
7:30
 mm
1
4
3
11
21
3
Temp °C
15
15
15
16
17
17
15
16
17
17
17
17
14
16
15
13
15
15
14
15
14
Feels °C
12
12
8
10
14
16
15
15
15
15
13
12
10
13
11
9
10
9
8
10
8
  • 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
How to use the Wavefinder 

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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 Cable Bay (Porth Trecastell) 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.


Information about the Cable Bay (Porth Trecastell) Surf forecast

The above surf forecast table for Cable Bay (Porth Trecastell) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cable Bay (Porth Trecastell) can be found by selecting the local surf guide option on the grey menu. Our Cable Bay (Porth Trecastell) 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 (Cable Bay (Porth Trecastell)) 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 Cable Bay (Porth Trecastell) 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 Anglesy? If you are looking for accommodation near Cable Bay, camping, hotels and holiday cottages in Anglesy, consider staying in Anglesey which is 4 km (2 miles) away. Other places in and around Anglesy where you can find information about places to rent, and car hire include Holyhead which is 14 km (9 miles) away, Bangor, Porthmadog and Llandudno.

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