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 Sep 2026 (local time)

Forecast update in  hr  min

Today's Cable Bay (Porth Trecastell) sea temperature is
16.8°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 14 Sep 2026:

  • Most powerful swell: Monday 14 Sep, 10PM (local time) - 6.5ft (2.0m), 6s period, SSW swell with 309 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 2.0m 6s and forecast to arrive on Monday (Sep 14) at 10PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Sep 16) at 4AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10PM (Mon 14th Sep)6.5ft (2.0m) 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 Cable Bay (Porth Trecastell) has got cooking for us over the next couple of weeks. I'll be straight with you, it's a bit of a tough stretch.

We're kicking off Sunday the 13th with pretty much nothing going on. A tiny 2 ft SW swell with a short, weak 6-second period, and the wind is light but onshore. The water's sitting at 62°, which is a touch warmer than normal for this time of year, but that's about the only highlight. The combined energy is a measly 18 – that's barely a ripple.

Monday the 14th and Tuesday the 15th see a bit more size, with the swell bumping up to around 4 ft to 5 ft from the SSW and WSW, but the period is still a poor 5 seconds. The problem is the wind. It's howling from the south and west at 12 to 22 mph, blowing straight onshore and making a complete mess of it. The energy climbs to a moderate 101 to 109, but it's all chop and no shape. Not worth getting wet for.

We get a bit more push on Thursday the 17th and Friday the 18th, with the swell hitting 5 ft from the WSW and W, period stretching to 6 seconds, and energy in the moderate 138 to 169 range. But again, that wind is a killer. Moderate to fresh cross-onshore breezes keep it lumpy and poor. Friday afternoon does see a brief window of onshore wind, but the swell drops to 4 ft, so it's a no-go.

Now, Saturday the 19th is the first day that gets a sniff of a chance. We've got a 6 ft to 6 ft SW swell with a 6 to 7-second period and a solid 255 to 314 combined energy. The wind eases to a gentle breeze, but it's still cross-onshore and fairly choppy. It's only a marginal call at best. For a spot like Cable Bay that is fairly consistent, this is a frustrating run.

From Sunday the 20th right through to Sunday the 27th, it's a long, bleak gap. Swell drops right off into the tiny stuff, below 3 ft, and for a few days there's literally no swell at all. The wind does go clean, with some glassy conditions and light offshore breezes on the 24th and 27th, but there's simply no wave energy to work with.

The one faint glimmer in this whole outlook lands on the 22nd and 23rd of September. On Tuesday the 22nd, we get a 4 ft WSW swell, period 6 seconds, and 120 combined energy, with a moderate cross-offshore breeze. The guidance says clean, which is a big positive. Then Wednesday the 23rd is the standout. The swell builds to 7 ft from the NW, with a 6-second period and strong energy of 308. The wind is a moderate cross-offshore, and the guidance is calling it clean. Now, 7 ft is getting up there, probably better for the more experienced crew, and with a short period it'll be a bit crumbly, but if you're an intermediate or above, that Wednesday morning and afternoon is your best shot by a mile. It's the only real stand out in the whole two weeks.

To be honest, for most of this period, the setup is so blown out and weak that a kitesurfer would have a better time of it than a paddle surfer.

So there you have it. A long, quiet spell with one clean, punchy day on the 23rd to keep hope alive. The forecasts can always change, so keep an eye on it.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Mon night. Very mild (max 17°C on Sun night, min 13°C on Tue night). Winds increasing (light winds from the S on Sun night, fresh winds from the SSW by Mon night).

Days 4-6 Weather Summary

Light rain (total 4mm), mostly falling on Wed night. Very mild (max 17°C on Sat afternoon, min 13°C on Wed night). Winds decreasing (fresh winds from the WSW on Wed night, light winds from the WSW by Sat afternoon).

Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
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
1
0
1
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
SSW
5
1.4
SSW
5
1.9
SW
6
1.6
WSW
5
1.1
WSW
5
0.5
SW
6
0.3
SW
6
0.6
W
4
1.2
SW
5
1.6
WSW
5
1.5
WSW
5
1.7
W
6
1.6
W
6
1.3
SW
5
1.4
SW
6
1.8
SW
6
1.6
SW
7
1
SW
7
1
NW
5
0.7
NW
5
0.6
SSW
3
Wave Graph
Metric surfscale
Energy kJ
23
117
269
138
69
16
6
12
60
138
112
178
152
96
147
282
221
91
51
25
7
Wind (km/h)
20
S
35
S
30
SW
30
W
20
W
30
NW
30
NW
20
W
30
SW
30
W
25
W
30
WNW
20
WSW
30
SSW
20
WSW
20
WSW
15
WSW
20
W
5
WNW
5
W
25
S
Wind State
cross-on
cross-on
on
cross-on
cross-on
cross
cross
cross-on
on
cross-on
cross-on
cross-on
cross-on
on
on
on
cross-on
cross-on
cross-on
glassy
cross-on
High Tide
11:50AM4.02m
00:07AM4.16m
12:24PM3.85m
00:44AM3.84m
1:00PM3.60m
1:24AM3.48m
1:40PM3.31m
2:09AM3.11m
2:30PM3.01m
3:16AM2.79m
3:54PM2.78m
5:10AM2.63m
5:52PM2.79m
Low Tide
6:23AM-0.01m
6:35PM0.19m
6:58AM0.30m
7:12PM0.44m
7:33AM0.66m
7:49PM0.75m
8:09AM1.03m
8:30PM1.08m
8:52AM1.36m
9:24PM1.38m
9:52AM1.62m
10:46PM1.58m
11:27AM1.71m
00:33AM1.54m
cloud
part cloud
rain showers
clear
part cloud
part cloud
cloud
part cloud
rain showers
part cloud
rain showers
part cloud
clear
light rain
rain showers
part cloud
part cloud
part cloud
cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:48
6:50
6:52
6:54
6:54
6:56
6:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:37
7:35
7:31
7:30
7:27
7:24
7:22
 mm
4
1
1
1
1
Temp °C
17
17
17
14
16
15
14
15
15
14
15
14
14
15
16
15
17
15
13
13
16
Feels °C
16
12
12
8
12
10
8
10
10
8
10
8
10
9
13
12
14
11
12
12
12
  • 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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How to use the Wavefinder 

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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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