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 27 Aug 2026 (local time)

Forecast update in  hr  min

Today's Cable Bay (Porth Trecastell) sea temperature is
17.7°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 27 Aug 2026:

  • Most powerful swell: Wednesday 2 Sep, 7PM (local time) - 7ft (2.2m), 6s period, SW swell with 408 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 2.2m 6s and forecast to arrive on Wednesday (Sep 02) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Saturday (Aug 29) at 10PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 7PM (Wed 2nd Sep)7ft (2.2m) 6s

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


The Lowdown

Alright, let’s break it down for Cable Bay (Porth Trecastell). Water temp is about where it should be for this time of year – nothing unusual.

We’re looking at a long dry spell. From Thursday the 27th of August through to the 6th of September, the surf is mostly poor. Wave energy is weak to moderate, with combined energy numbers in the tens or low hundreds (like 11, 26, 38, up to 105). Swell heights are tiny, usually under 3ft, and the wind is often onshore, cross-onshore, or just messy. Thursday morning the 27th has a 0.3ft SW swell with a 12-second period and a light offshore breeze, but it’s still too small to ride. Saturday the 29th sees a 3ft SSW swell, but a fresh 30 km/h S cross-onshore wind makes it lumpy. Wednesday the 2nd of September afternoon has a 6ft SSW swell with combined energy of 235, but a fresh 30 km/h SSW cross-onshore wind spoils it.

Then Monday the 7th of September morning rolls in with a 8ft WNW swell, 7-second period, combined energy of 502 (strong energy), and a clean cross-offshore wind from the NNW at 15 km/h. That’s the standout. At 8ft, it’s only for the experienced crew – beginners should stay on the beach. The swell direction is a bit off the optimum SW, but the exposed setup and clean conditions make it the best call of the whole forecast. Crowds can be an issue here sometimes, so be ready.

After that, it fades fast. Tuesday the 8th and Wednesday the 9th are tiny or flat. Thursday the 10th has a clean 3ft SSW swell with a cross-offshore breeze, but the period is only 4 seconds – short and weak. Friday the 11th morning shows a 8ft WSW swell with a 6-second period and combined energy of 466, but the wind is cross-shore and it’s still poor surf, so don’t plan around it.

The only real shot is Monday morning the 7th of September. That’s a solid, expert-only session. The rest of the 16 days is mostly a bust.

Rusty

Short Range Forecast

Heavy rain (total 41mm), heaviest during Thu afternoon. Warm (max 21°C on Wed night, min 16°C on Wed night). Winds increasing (light winds from the SW on Thu afternoon, fresh winds from the S by Sat morning).

Days 4-6 Weather Summary

Light rain (total 6mm), mostly falling on Tue morning. Very mild (max 17°C on Sun afternoon, min 14°C on Sat night). Wind will be generally light.

Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
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)
0.2
SSW
7
0.2
SSW
7
0.3
SSW
7
0.7
SSW
4
0.7
SSW
6
0.9
SSW
7
1
SSW
7
1.1
SSW
7
0.9
SSW
8
0.6
SW
9
0.6
SSW
8
0.6
SSW
7
0.7
SW
7
0.6
SSW
7
0.6
SSW
7
0.5
SW
7
0.5
SW
7
0.7
SW
5
0.9
SSW
5
1.9
SSW
6
1.5
SW
7
Wave Graph
Metric surfscale
Energy kJ
6
4
9
16
35
76
83
105
123
59
42
33
53
35
36
22
21
23
37
235
195
Wind (km/h)
15
NE
10
ENE
5
WSW
15
WNW
15
SW
25
SSW
30
S
10
SW
30
WNW
15
SSW
15
SSW
10
SSE
20
WNW
15
W
20
SW
25
W
20
NW
15
NNW
10
SW
30
SSW
40
SSW
Wind State
off
cross-off
on
cross-on
on
cross-on
cross-on
on
cross-on
on
cross-on
cross
cross
cross-on
on
cross-on
cross
cross-off
on
cross-on
on
High Tide
9:55AM3.58m
10:04PM4.02m
10:23AM3.73m
10:32PM4.18m
10:51AM3.84m
11:00PM4.28m
11:19AM3.92m
11:30PM4.30m
11:49AM3.93m
00:03AM4.23m
12:23PM3.87m
00:40AM4.07m
1:01PM3.73m
1:22AM3.82m
Low Tide
4:13AM0.41m
4:20PM0.46m
4:45AM0.20m
4:53PM0.30m
5:18AM0.06m
5:26PM0.21m
5:52AM0.00m
6:01PM0.20m
6:27AM0.05m
6:37PM0.27m
7:03AM0.19m
7:16PM0.42m
7:43AM0.43m
7:59PM0.63m
light rain
heavy rain
mod rain
light rain
part cloud
rain showers
rain showers
part cloud
part cloud
part cloud
part cloud
rain showers
part cloud
cloud
light rain
rain showers
part cloud
clear
part cloud
cloud
mod rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:16
6:18
6:20
6:22
6:24
6:26
6:28
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:20
8:16
8:15
8:13
8:09
8:07
8:06
 mm
4
17
6
1
4
8
1
2
3
9
Temp °C
16
16
16
16
17
16
18
17
15
16
17
16
15
16
16
15
17
16
14
16
17
Feels °C
14
16
17
15
16
14
14
16
11
13
15
15
12
13
13
11
14
13
10
11
11
  • 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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