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

information circle12 Day Weather and Surf, issued 12 pm Sunday 14 Sep 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
16.4° C
(Which is 1.1°C warmer than normal for this time of year)


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

The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 12 days are 4.0m 9s and forecast to arrive on Monday (Sep 15) at 10AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 7s period and expected on Tuesday (Sep 16) at 10AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10AM (Mon 15th Sep)13ft (4.0m) 9s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 42mm), heaviest during Tue night. Very mild (max 16°C on Sun afternoon, min 13°C on Sun morning). Winds decreasing (near gales from the SW on Mon morning, light winds from the SW by Tue night).

Days 3-6 Weather Summary Moderate rain (total 10mm), heaviest on Fri morning. Very mild (max 18°C on Fri afternoon, min 13°C on Wed night). Winds decreasing (strong winds from the SW on Wed afternoon, light winds from the S by Thu night).

Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1.2
SSW
2.3
S
3
SW
4
SW
3.5
WSW
3
W
2
W
1.4
WSW
1.1
SW
2.2
SW
2.4
SW
2.3
SW
2
SW
1.3
SW
1
SSW
0.8
SSW
0.7
SSW
0.9
SSW
0.8
SSW
1.4
SSW
2.2
SW
Period(s) (?)578987665787667775657
Wave
Graph
(?)Metric surfscale
Energy kJ (?)614671195261914257892931267450165755831614110870464637105412
Wind
(km/h)
30
S
50
SSE
45
SW
60
SW
50
W
50
W
35
W
25
WSW
25
SW
40
SW
50
SW
45
SW
30
SW
20
SW
10
S
35
S
35
S
30
S
30
SSW
30
SSW
35
SSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
cross-
on
ononcross-
on
cross-
on
cross-
on
cross-
on
ononononononcross-
on
cross-
on
cross-
on
cross-
on
oncross-
on
cross-
on
High Tide
/ height (m)
2:38PM
3.35
3:24AM
3.17
4:01PM
3.11
5:15AM
2.95
5:51PM
3.10
7:04AM
3.04
7:18PM
3.33
8:09AM
3.25
8:14PM
3.62
8:51AM
3.46
8:54PM
3.88
9:23AM
3.65
9:29PM
4.09
Low Tide
/ height (m)
9:52PM
0.94
10:32AM
1.24
11:20PM
1.09
12:02PM
1.31
12:51AM
0.98
1:23PM
1.13
2:02AM
0.70
2:22PM
0.85
2:54AM
0.40
3:09PM
0.58
3:37AM
0.16
3:49PM
0.37
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunrise6:48--6:50--6:52--6:54--6:54--6:56--6:58--
Sunset-7:37--7:35--7:31--7:30--7:27--7:24--7:22-
light rain
rain showers
thunderstorm
rain showers
light rain
part cloud
part cloud
part cloud
heavy rain
rain showers
part cloud
part cloud
part cloud
part cloud
rain showers
light rain
part cloud
rain showers
light rain
part cloud
thunderstorm
Rain (mm)
33532---263----24-13-6
Temp. °C141615141414141515171615141515171818151514
Feels °C (?)8873548101211878111412131411108
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Wales - Anglesy

  1. weather stationWind Update Still cross-shore at Cable Bay (Porth Trecastell) (strong winds from the SSE at Valley RAF Airport 4 km from Cable Bay (Porth Trecastell)). A 2.0m windswell from the S

    Cable Bay (Porth Trecastell)
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1 h 31 min ago

43 km/h
SSE
Cross-Shore
Please reload the page to see if there are any updates.

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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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