Cable Bay (Porth Trecastell) Surf Break

Lat Long: 53.22° N 4.51° W

Cable Bay (Porth Trecastell) Surf Forecast and Surf Report

Issued: 6 am 11 Jul 2026 (local time)

Forecast update in  hr  min

Today's Cable Bay (Porth Trecastell) sea temperature is
16.1° 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 Jul 2026:

  • Most powerful swell: Tuesday 14 Jul, 1PM (local time) - 0.5ft (0.1m), 18s period, SW swell with 12 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 0.1m 18s and forecast to arrive on Tuesday (Jul 14) at 1PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Sunday (Jul 12) at 7PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 1PM (Tue 14th Jul)0.5ft (0.1m) 18s

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


Alright crew, Rusty here. Let’s cut to the chase – this forecast is a desert. We’ve got a solid 13-day gap with no surf worth mentioning before anything even tries to show up. The first real chance of a wave doesn’t come until the 24th of July.

The water at Cable Bay (Porth Trecastell) is 61°F, a touch warmer than normal for this time of year, so that’s one small blessing.

The afternoon of the 24th is our first glimmer: a 5ft swell from the SSW, with a short 5-second period. The wind is offshore from the NE, so it’ll be clean. The combined energy is moderate (104), so it’s surfable, but it’s nothing to write home about – just ordinary.

The 25th of July, Saturday morning, sees a 8ft swell from the west. That’s a big one, but it’s coming with onshore wind and strong energy (461). That’s for experts only, and with the wind, it’s a messy, lumpy mess. The afternoon is plain ugly.

That’s the whole story. No standout days, just a long wait for a couple of average windows. Forecasts can change, but right now, it’s a waiting game.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 24°C on Sat morning, min 14°C on Sun night). Winds increasing (light winds from the N on Sat morning, fresh winds from the ENE by Mon night).

Days 4-6 Weather Summary

Heavy rain (total 33mm), heaviest during Thu night. Warm (max 24°C on Tue afternoon, min 17°C on Tue morning). Winds decreasing (fresh winds from the NE on Tue afternoon, calm by Thu night).

Saturday
11
Sunday
12
Monday
13
Tuesday
14
Wednesday
15
Thursday
16
Friday
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)
0.7
NNW
5
0.7
N
5
0.7
N
5
0.7
NE
5
0.9
NE
4
0.8
NE
5
0.1
SE
4
0.1
S
19
0.1
S
15
0.1
S
18
0.1
SW
18
0.1
SW
14
0.1
SW
16
0.1
SW
16
0.1
S
16
0.1
SW
14
0.1
SW
14
0.2
SSW
6
0.2
SSW
6
0.2
SSW
6
0.2
SSW
6
Wave Graph
Metric surfscale
Energy kJ
0
0
0
0
0
0
1
7
4
6
12
7
10
10
7
8
8
3
4
6
6
Wind (km/h)
15
NNW
15
NNE
20
ENE
25
ENE
30
NE
25
ENE
30
ENE
30
NE
25
ENE
25
ENE
30
NE
25
ENE
25
NE
20
NE
25
NE
5
E
5
NNE
10
ESE
10
N
10
N
10
NNW
Wind State
cross-off
cross-off
cross-off
off
off
off
off
off
off
off
off
off
off
off
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
7:20PM3.49m
7:48AM3.62m
8:18PM3.75m
8:48AM3.79m
9:12PM4.02m
9:43AM3.93m
10:03PM4.26m
10:35AM4.00m
10:51PM4.43m
11:24AM3.99m
11:39PM4.50m
12:11PM3.90m
00:25AM4.44m
Low Tide
1:49PM0.78m
2:21AM0.73m
2:51PM0.57m
3:21AM0.38m
3:45PM0.34m
4:14AM0.05m
4:35PM0.16m
5:04AM-0.20m
5:21PM0.05m
5:52AM-0.33m
6:06PM0.03m
6:39AM-0.31m
6:51PM0.12m
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
rain showers
rain showers
rain showers
thunderstorm
heavy rain
part cloud
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:03
5:05
5:05
5:07
5:07
5:09
5:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:42
9:40
9:39
9:38
9:37
9:37
9:36
 mm
3
12
1
2
15
Temp °C
24
24
22
23
23
22
20
21
19
22
24
23
24
24
20
21
23
20
19
21
18
Feels °C
25
23
19
20
18
18
14
15
13
19
20
19
23
22
18
22
24
20
17
19
17
  • 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
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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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