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 14 Jul 2026 (local time)

Forecast update in  hr  min

Today's Cable Bay (Porth Trecastell) sea temperature is
17.0° C
2.2° 

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 14 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 1.3m 6s period and expected on Sunday (Jul 19) at 1AM.

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.


The Lowdown

Alright, it’s your boy Rusty. Let’s get into it, and I gotta be straight with you – this one’s a tough read for the next two weeks.

Right off the bat, we’re looking at a flat spell that’s gonna test your patience. For Cable Bay (Porth Trecastell), there’s nothing worth paddling out for from Monday the 13th of July all the way through most of the next week. The swell is barely a whisper, with heights hanging around 0.3 ft to 0.7 ft, and the combined wave energy is laughable – mostly single digits (7 at best early on), so it’s basically a lake. The wind is often offshore or clean, but with no swell to push, it’s all show and no go. Water temp is sitting at 63°F and that’s 4°F warmer than normal for this time of year, so it’s a warm bath, but you’ll just be floating.

The middle of the month is a total write-off. From the 16th to the 21st, the energy drops to zero on a few days, and the small pulses that show up are weak and short-period. A few cross-offshore breezes keep the surface clean, but there’s nothing to ride. The 22nd of July sees a tiny bump – 1 ft from the NW with a period of only 4 seconds – and the energy is just 7. That’s not surf, mate, that’s a ripple.

The only real window that might get your heart beating a little is toward the end of the run. Around the 24th and 25th of July, a SSW swell rolls in. Friday afternoon the 24th shows 3 ft from the SSW, period of 4 seconds, and combined energy of 32 – still weak, but it’s something. The problem is the wind: it’s onshore from the SSW at 12 to 16 mph, making it messy. Saturday the 25th is similar, with 3 ft to 2 ft and the same onshore wind, so it’s gonna be lumpy and blown out. That’s not for beginners – it’s small but choppy, and the short period means the waves are weak and crumbly.

By Sunday the 26th, the wind swings cross-shore from the SE at 16 mph, and the swell drops again. The 27th and 28th are a complete mess with near gale and fresh breeze strength cross-onshore winds, so forget about it.

Bottom line: there’s no standout session here. The best you’re looking at is the 24th and 25th, but it’s poor quality with onshore winds. If you’re desperate, a longboard might catch the tiny clean lines on the 22nd morning, but don’t expect much. This is a classic blank run for this area – it’s normal for the summer to go quiet, and forecasts can flip, but right now, I’d hang the board up for a week.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 23°C on Wed afternoon, min 16°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 22°C on Fri morning, min 12°C on Fri night). Winds increasing (light winds from the NNE on Thu night, fresh winds from the N by Sat afternoon).

Tuesday
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
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)
0.1
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
6
0.1
SW
14
0.1
SW
7
0.2
SSW
7
0.2
SSW
7
0.1
SW
12
0.1
S
11
0.1
S
11
0.1
S
11
0.1
S
11
0.1
S
10
0.5
NNE
3
0.4
NNW
4
0.4
NNW
4
0.4
N
4
Wave Graph
Metric surfscale
Energy kJ
6
12
7
10
10
7
1
8
2
5
6
6
2
2
2
2
2
0
0
0
0
Wind (km/h)
25
NE
20
NE
20
ENE
20
ENE
20
NE
15
ENE
15
NE
20
NNE
15
NNE
15
NE
20
N
15
N
20
NNW
30
NNW
20
N
20
N
20
N
10
NNE
10
NW
15
N
10
N
Wind State
off
off
off
off
off
off
off
off
off
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross-off
cross-off
High Tide
9:43AM3.93m
10:03PM4.26m
10:35AM4.00m
10:51PM4.43m
11:24AM3.99m
11:39PM4.50m
12:11PM3.90m
00:25AM4.44m
12:58PM3.76m
1:12AM4.25m
1:45PM3.57m
2:00AM3.97m
2:34PM3.37m
2:51AM3.65m
Low Tide
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
7:25AM-0.16m
7:35PM0.30m
8:10AM0.10m
8:19PM0.55m
8:56AM0.43m
9:06PM0.83m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:07
5:07
5:09
5:11
5:11
5:13
5:15
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:38
9:37
9:37
9:36
9:34
9:32
9:31
 mm
Temp °C
19
21
22
22
23
23
23
23
19
22
22
19
15
16
14
16
17
15
17
19
16
Feels °C
14
17
18
20
19
20
19
18
16
18
18
17
11
10
9
12
14
13
14
16
13
  • 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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