Cable Bay (Porth Trecastell) surfForecast / Wales – Anglesy / UK

information circle12 Day Weather and Surf, issued 6 pm Thursday 10 Jul 2025 BST
Forecast update in hr  min  s Forecast update imminent
Cable Bay (Porth Trecastell) surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Cable Bay (Porth Trecastell) sea temperature is
15.1° C
(Which is slightly warmer than usual)


Best Forecast Surf Conditions for Cable Bay (Porth Trecastell) this week:

The surf forecast for Cable Bay (Porth Trecastell) over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Jul 17) at 1AM. The primary swell is predicted to be 1.0m and 5s period. The wind is predicted to be cross-onshore as the swell arrives.

The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 12 days are 1.1m 5s and forecast to arrive on Wednesday (Jul 16) 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 0.3m 4s period and expected on Tuesday (Jul 15) at 7AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Thu 17th Jul)3.5ft (1.0m) 5s
Best Surf 1AM (Thu 17th Jul)3.5ft (1.0m) 5s
Most Powerful 7PM (Wed 16th Jul)3.5ft (1.1m) 5s

Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 12 days.

Updates in  hr  min  s Forecast update imminent
Thu
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tue
22
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.4
SE
0.2
S
0.1
S
0.4
SW
0.5
SW
0.6
SSW
0.5
SW
0.4
SW
0.4
SW
0.6
SSW
1
SSW
1
SW
0.6
SSW
0.4
SW
0.3
SW
0.2
SSW
0.1
SW
0.1
SW
0.1
SW
0.1
SW
0.5
SSW
0.5
SSW
0.6
SSW
0.4
SW
0.3
NW
0.1
SW
0.8
SW
1.1
SW
Period(s) (?)--------331135666445566551099934443645
Wave
Graph
(?)Metric surfscale
Energy (?)000000005134144935175946532816865444118116441768
Wind
(km/h)
10
W
5
SSE
5
S
10
WSW
10
ENE
5
SSE
10
NW
10
ESE
5
SE
10
NE
15
SSW
25
SSW
30
SSW
10
WNW
20
WSW
15
SW
20
S
20
S
20
SSW
10
SSE
15
SSW
20
SSW
10
SSW
15
WNW
10
WSW
5
ENE
10
E
10
NW
10
E
10
E
20
WSW
15
S
25
S
20
S
15
S
15
SSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
crossglassonoffglasscrosscross-
off
crossoffcross-
on
oncross-
on
crosscross-
on
oncross-
on
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
oncross-
on
cross-
on
cross-
off
cross-
off
crosscross-
off
cross-
off
oncross-
on
cross-
on
cross-
on
cross-
on
on
High Tide
/ height (m)
10:13PM
3.74
10:32AM
3.54
10:48PM
3.89
11:08AM
3.59
11:22PM
4.01
11:43AM
3.62
11:58PM
4.08
12:21PM
3.61
12:36AM
4.09
1:02PM
3.56
1:17AM
4.04
1:48PM
3.48
2:03AM
3.91
2:40PM
3.38
2:58AM
3.73
3:40PM
3.29
4:02AM
3.54
4:49PM
3.24
5:17AM
3.41
6:01PM
3.28
6:33AM
3.39
7:10PM
3.42
7:43AM
3.48
Low Tide
/ height (m)
4:35PM
0.63
5:02AM
0.47
5:13PM
0.51
5:40AM
0.34
5:50PM
0.43
6:20AM
0.25
6:29PM
0.42
7:00AM
0.22
7:08PM
0.47
7:41AM
0.24
7:49PM
0.57
8:24AM
0.34
8:34PM
0.72
9:12AM
0.49
9:25PM
0.88
10:06AM
0.67
10:26PM
1.03
11:10AM
0.84
11:40PM
1.08
12:25PM
0.91
1:00AM
0.99
1:38PM
0.85
2:13AM
0.74
Thu
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tue
22
Sunrise--5:03--5:05--5:05--5:07--5:07--5:09--5:11--5:11--5:13--5:15--5:16--5:18
Sunset9:43--9:42--9:40--9:39--9:38--9:37--9:37--9:36--9:34--9:32--9:31--9:30--
clearclearclearclearclearclearclearclearclearpart cloudclearpart cloudclearclearclearclearpart cloudpart cloudclearpart cloudpart cloudpart cloudclearpart cloudpart cloudpart cloudpart cloudpart cloudpart cloudpart cloudpart cloudpart cloudpart cloudrain showerspart cloudlight rain
Rain (mm)
---------------------------------1-3
Temp. °C181820222223252323242316171614151616171618181715161620202022201616161514
Feels °C (?)171919222123252222232313131411121313141415151614151619181823171312131212

Short Range Forecast: Mostly dry. Warm (max 25°C on Sat afternoon, min 17°C on Thu night). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Warm (max 24°C on Sun afternoon, min 13°C on Tue morning). Winds increasing (light winds from the SSE on Sun night, fresh winds from the SSW by Mon afternoon).

Days 6-9 Weather Summary Mostly dry. Warm (max 20°C on Sat morning, min 14°C on Thu night). Wind will be generally light.

Long Range Forecast: Light rain (total 8mm), mostly falling on Tue afternoon. Warm (max 22°C on Sun morning, min 14°C on Tue morning). Wind will be generally light.

  • 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 12 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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