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 am 24 Aug 2026 (local time)

Forecast update in  hr  min

Today's Cable Bay (Porth Trecastell) sea temperature is
17.8°C
2.1° 

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 24 Aug 2026:

  • Best quality surf: Friday 28 Aug, 10PM (local time) - 2.5ft (0.7m), 7s period, SW swell with cross-offshore winds.
  • Most powerful swell: Friday 28 Aug, 1AM (local time) - 4ft (1.2m), 10s period, SSW swell with 272 kJ wave energy.
  • Next surfable swell (1★+): Friday 28 Aug, 10PM (local time) - 2.5ft (0.7m), 7s period with SW swell.

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

The surf forecast for Cable Bay (Porth Trecastell) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 28) at 10PM. The primary swell is predicted to be 0.7m and 7s period with a secondary swell of 1.1m and 4s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 1.2m 10s and forecast to arrive on Friday (Aug 28) at 1AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Saturday (Aug 29) at 7AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Fri 28th Aug)2.5ft (0.7m) 7s
Best Surf10PM (Fri 28th Aug)2.5ft (0.7m) 7s
Most Powerful 1AM (Fri 28th Aug)4ft (1.2m) 10s

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


The Lowdown

Right then, let’s have a look at what’s on the cards for Cable Bay (Porth Trecastell). I’ll be honest with you, this is a tough stretch to call. The next sixteen days are pretty quiet for most of it, but there’s a spike of something proper on the horizon, if you can wait.

The pattern is a long, drawn-out lull. From now through the end of August and into early September, the swell is tiny. You’re looking at maybe 0.3ft to 1ft for days on end, with a bit of a blip up to 4ft on the 27th and 28th of August, but that’s accompanied by poor conditions. The combined wave energy is pitiful – you’ll see numbers like 12 and 20 – nothing to get excited about. The wind is all over the place, and most of the time it’s cross-on or onshore.

Honestly, for most of the first week and a half, it’s a write-off. There’s a big gap of nothing surfable. Then, around the 2nd of September, things change. We get a proper pulse of swell. Wednesday the 2nd of September sees 7ft from the SW, and the combined energy jumps right up to 400 and then 474 – that’s proper power for sure. The problem is it’s being hammered by a fresh cross-onshore wind right through that day, so it’ll be lumpy as hell. Not clean.

The real standout, the one to pencil in, is the next morning. Thursday the 3rd of September. The swell is still sizeable, holding around 7ft from the W, with energy at 286. The wind swings around to a light onshore from the SW at 6 mph, but that’s manageable. It’s a big, powerful groundswell with a short period of 6 seconds, so expect a bit of a mess at the sandbanks. This is pretty clean for the area, and for the experienced surfer, those 6-7ft sets will be there to be had.

Later that afternoon, the swell actually pushes to 7ft from the WNW, with 308 energy, but the wind turns cross-onshore again. So, Thursday morning is your best chance. It’s a bit too big for beginners, but for the rest of you, it’s the only real window of quality in this whole 16-day run.

From there, it drops off sharp again. The 4th and 5th of September are back to poor, small conditions. The long period swells at the very end, on the 5th and 6th of September, are too small to do anything at this exposed beach break – they’d just be lining up too straight.

So, you’ve got a long wait. Be patient. Mark your calendar for Thursday morning, the 3rd of September. That’s your chance. The rest is a waiting game.

Rusty.

Short Range Forecast

Light rain (total 3mm), mostly falling on Tue night. Warm (max 22°C on Tue afternoon, min 13°C on Mon night). Winds increasing (calm on Mon morning, fresh winds from the E by Tue night).

Days 4-6 Weather Summary

Moderate rain (total 10mm), heaviest on Sat afternoon. Very mild (max 19°C on Wed night, min 14°C on Fri night). Wind will be generally light.

Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
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
1
2
0
1
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)
0.1
SW
14
0.1
SW
13
0.1
SW
13
0.1
SW
13
0.1
SW
13
0.2
SSW
8
0.4
SW
8
0.3
SSW
8
0.2
SSW
7
0.3
SSW
7
1.1
SSW
5
1.2
SSW
10
1.1
SSW
8
1
SSW
8
1.4
WNW
5
0.9
W
4
0.9
SW
4
0.7
SW
5
0.4
SW
6
0.5
SSW
8
0.7
SSW
8
Wave Graph
Metric surfscale
Energy kJ
8
7
7
7
7
7
17
12
5
10
50
272
164
119
98
31
28
25
10
35
50
Wind (km/h)
5
SE
10
NE
20
E
20
E
20
ENE
15
ENE
10
E
5
NNE
10
ENE
5
SE
10
SW
10
SW
10
WSW
20
SW
5
NNW
15
S
20
S
25
WSW
30
SW
50
SSW
30
WSW
Wind State
glassy
off
cross-off
cross-off
off
off
cross-off
glassy
cross-off
cross
on
on
cross-on
on
cross-off
cross-on
cross-on
cross-on
on
cross-on
cross-on
High Tide
8:05AM2.99m
8:24PM3.28m
8:49AM3.20m
9:03PM3.55m
9:25AM3.40m
9:35PM3.81m
9:55AM3.58m
10:04PM4.02m
10:23AM3.73m
10:32PM4.18m
10:51AM3.84m
11:00PM4.28m
11:19AM3.92m
11:30PM4.30m
Low Tide
2:33PM1.20m
3:02AM0.96m
3:12PM0.93m
3:39AM0.68m
3:47PM0.67m
4:13AM0.41m
4:20PM0.46m
4:45AM0.20m
4:53PM0.30m
5:18AM0.06m
5:26PM0.21m
5:52AM0.00m
6:01PM0.20m
clear
clear
part cloud
cloud
part cloud
light rain
part cloud
thunderstorm
rain showers
rain showers
cloud
clear
clear
part cloud
clear
cloud
mod rain
rain showers
rain showers
thunderstorm
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:13
6:16
6:16
6:18
6:20
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:27
8:23
8:22
8:20
8:16
8:15
8:13
 mm
1
2
1
2
7
5
1
2
2
Temp °C
18
21
19
20
22
21
20
21
19
19
19
17
17
18
16
16
17
16
16
16
15
Feels °C
17
18
15
17
18
14
21
22
18
18
18
17
14
14
14
12
14
15
11
8
8
  • 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 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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