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 14 Jul 2026 (local time)

Forecast update in  hr  min

Today's Cable Bay (Porth Trecastell) sea temperature is
16.9° 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 14 Jul 2026:

  • Most powerful swell: Tuesday 14 Jul, 7PM (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 7PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Saturday (Jul 18) at 1PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 7PM (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, let’s talk Cable Bay (Porth Trecastell). I’m not gonna sugarcoat it, mate – the outlook is a tough one. We’ve got a long stretch of nothing to start, with the first real chance coming on the 22nd of July. That’s a long gap of quiet water.

From now until the 21st of July, it’s a flat spell. The swell is all but gone, and while the wind is often offshore, there’s no energy to push. The combined swell energy is stuck in the single digits or low teens – that’s a dead ocean. The water temp on the 14th is 62°, which is 4° warmer than the usual for this time of year, so it’s notably warm.

The 22nd of July morning brings a weak 0.3m (1ft) south swell, with a period of only 4 seconds. Light offshore wind from the NE will keep it clean, but it’s just small, messy slop. The combined energy is 2 (weak). Not worth the paddle.

The 25th of July morning is a bit better. A 0.4m (1ft) SSW swell, 7-second period, with clean cross-offshore winds from the NNW. The combined energy is 16 (weak). Still tiny, but it’s the pick of the litter. Sunday morning the 26th of July is the standout. The wind goes glassy, dead calm, and we get a 0.6m (2ft) WNW swell. The period is short at 4 seconds, so it’s windswell, but a glassy surface makes it the cleanest wave of the whole 16 days. The combined energy is 14 (weak). It’s a small day, but for a longboard or a soft top, it’s your best bet.

The 28th of July morning also has glassy conditions, with a 0.4m (1ft) SW swell and 6-second period. The energy is 9 (weak). Once again, tiny and clean.

The standout is the morning of the 26th of July. The glassy conditions and the 0.6m (2ft) swell (WNW) make it the only real window to get a clean ride. The 25th is next best. For the rest of the run, it’s flat or too small to bother. Crowds at Cable Bay can be “sometimes” a problem, but with this little swell, you’ll be alone.

Rusty

Short Range Forecast

Mostly dry. Warm (max 23°C on Wed morning, min 18°C on Tue morning). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 23°C on Fri morning, min 12°C on Fri night). Wind will be generally light.

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
14
0.2
SSW
6
0.2
SSW
6
0.1
SW
12
0.1
S
11
0.1
S
11
0.1
S
11
0.1
S
11
0.1
S
10
0.1
S
10
0.7
N
5
0.6
N
5
0.5
N
4
Wave Graph
Metric surfscale
Energy kJ
6
12
7
10
10
7
1
8
8
4
6
6
2
2
2
2
2
2
0
0
0
Wind (km/h)
25
ENE
25
NE
20
ENE
20
ENE
25
NE
15
ENE
10
NE
20
NNE
15
NE
10
NNE
20
N
10
N
20
NNW
20
N
15
NNE
10
WNW
15
NNW
10
NNE
20
N
20
NNW
10
NE
Wind State
off
off
off
off
off
off
off
off
off
off
cross-off
cross-off
cross-off
cross-off
off
cross
cross-off
cross-off
cross-off
cross-off
off
High Tide
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
4:35PM0.16m
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
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
cloud
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
21
23
23
23
23
23
20
23
22
18
16
18
16
18
18
16
14
17
19
Feels °C
14
16
16
21
19
20
20
19
17
20
18
16
13
15
14
16
15
13
10
14
17
  • 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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