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 22 Jul 2026 (local time)

Forecast update in  hr  min

Today's Cable Bay (Porth Trecastell) sea temperature is
17.0° C
1.8° 

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 22 Jul 2026:

  • Most powerful swell: Tuesday 28 Jul, 10PM (local time) - 4.5ft (1.4m), 6s period, SW swell with 128 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 1.4m 6s and forecast to arrive on Tuesday (Jul 28) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Thursday (Jul 23) at 1AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10PM (Tue 28th Jul)4.5ft (1.4m) 6s

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 the next couple of weeks around Cable Bay (Porth Trecastell). I’ll be straight with you – it’s a bit of a tough stretch. The forecast is pretty bleak for a good while, with no real surf to speak of for the first week and a half, and even when something pops up, it’s not looking great. We’ve got a long gap of nothing from the start, and the first real chance of a wave doesn’t come until the tail end of the period.

The water here is sitting at about 63°, which is a touch warmer than normal for this time of year – a bit of a nice surprise, but it won’t make up for the lack of waves.

Right, from the get-go, Wednesday the 22nd through to the end of July, it’s a dead loss. Wednesday morning you’ve got a cloudy sky and a 12 mph north wind blowing cross-offshore, but the swell is a flat zero. Same story for the afternoon, and the rest of that week. Thursday and Friday are clear and sunny, but still no swell – just a whisper of 0.3 ft from the south on Friday, with a period of 13 seconds, but the combined energy is only 3 – that’s practically nothing. You’d be better off having a beach day. Saturday the 25th brings a bit of a pulse – 3 ft from the west-southwest, but with a short, choppy period of just 4 seconds. The wind is onshore and strong, making it messy. The combined energy is a weak 29. Honestly, not worth paddling out.

Sunday the 26th is even worse – 1 ft with a fresh 19 mph cross-onshore wind. It’s lumpy and horrible. Monday and Tuesday continue the story of small, short-period swell with fresh, onshore winds. The combined energy never gets above 54. This is all poor surf.

Now, we start to see a bit of a shift as we head into the end of the month. On Friday the 31st of July, the morning still looks poor, but the afternoon brings a 5 ft swell from the south-southwest, with a period of 6 seconds. The combined energy jumps to 160 – that’s moderate. But the wind is a moderate 12 mph cross-onshore, so it’s going to be choppy. The wave comment is still “poor surf conditions” – it’s not clean.

The first real, albeit marginal, spot comes on Sunday the 2nd of August. The afternoon shows a 6 ft swell from the south-southwest, with a period of 6 seconds, and the combined energy is 209 – that’s moderate energy. The wind is a gentle 9 mph onshore. The wave comment finally says “marginal surf forecast or questionable tide conditions.” This is the best we’ve got in the whole 16 days, and it’s still not a standout. It’s the only time the score crept up to a 1 out of 10. The swell is over 5 ft, so it’s a bit much for beginners, and the onshore wind won’t help. It’s a bit of a messy one, but it’s the only window where you might get a wave.

After that, Monday the 3rd and Tuesday the 4th of August are back to small, choppy, and poor conditions. The rest of the forecast is a washout – tiny swell, strong winds, and nothing to get excited about.

So, the honest truth is there’s no standout session here. The only date that might be worth a look is Sunday the 2nd of August, but go in with low expectations. The break is fairly consistent, but the forecasts just aren’t lining up for it. The surf is poor, and the wind is mostly onshore or cross-onshore, so it’s not going to be clean. For the first 10 days, it’s a solid blank run. It’s a bummer, but it happens. The forecasts can change, so keep an eye on it, but for now, I’d leave the boards in the car.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 17°C on Wed afternoon, min 13°C on Wed morning). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 8mm), mostly falling on Sat night. Very mild (max 17°C on Sat afternoon, min 13°C on Sun night). Mainly fresh winds.

Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
Monday
27
Tuesday
28
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
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1
N
6
0.9
NNW
5
1.2
N
6
1
N
6
0.8
N
5
0.6
N
5
0.1
S
13
0.1
S
13
0.4
WSW
3
0.9
WSW
4
0.9
SW
5
0.5
SW
6
0.4
SW
5
0.4
SW
6
0.1
SW
6
0.5
NW
4
0.8
SSW
4
0.6
SSW
4
0.7
SSW
4
1.1
SSW
5
1.2
SW
6
Wave Graph
Metric surfscale
Energy kJ
0
0
0
0
0
0
3
3
4
23
31
18
7
11
1
7
18
12
11
54
89
Wind (km/h)
20
N
20
NNW
20
N
20
N
20
NNW
10
N
10
WNW
10
WSW
15
SW
25
SW
20
WSW
10
W
30
WNW
20
WNW
25
WNW
20
SSW
30
SSW
20
S
30
SSW
35
SSW
10
SW
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
on
on
on
cross-on
cross-on
cross-on
cross
cross
on
cross-on
cross-on
cross-on
cross-on
on
High Tide
4:30PM3.04m
4:56AM3.09m
5:37PM2.97m
6:08AM2.98m
6:44PM3.01m
7:16AM2.99m
7:44PM3.13m
8:13AM3.09m
8:35PM3.31m
9:01AM3.24m
9:19PM3.52m
9:41AM3.38m
9:56PM3.72m
Low Tide
10:38AM1.10m
11:03PM1.32m
11:45AM1.31m
00:23AM1.40m
1:01PM1.37m
1:39AM1.32m
2:06PM1.28m
2:38AM1.14m
2:56PM1.10m
3:23AM0.93m
3:37PM0.90m
4:03AM0.71m
4:13PM0.71m
part cloud
clear
part cloud
clear
clear
clear
clear
clear
cloud
light rain
part cloud
light rain
light rain
part cloud
clear
part cloud
part cloud
part cloud
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:18
5:18
5:20
5:22
5:24
5:24
5:26
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:29
9:28
9:25
9:24
9:22
9:22
9:20
 mm
2
5
1
Temp °C
16
17
15
16
17
17
15
17
16
16
17
15
15
17
16
15
17
16
17
18
16
Feels °C
13
14
13
13
13
16
14
15
14
13
14
14
11
14
12
9
11
13
12
13
15
  • 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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