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Surf Forecasts:

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

information circle16 Day Weather and Surf, issued 5 pm Sunday 15 Mar 2026 GMT
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
8.5° C
 (Which is 1.0°C warmer than normal for this time of year)

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

The surf forecast for Cable Bay (Porth Trecastell) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Mar 18) at 6AM. The primary swell is predicted to be 1.1m and 7s period with a secondary swell of 0.1m and 19s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 3.0m 8s and forecast to arrive on Tuesday (Mar 17) at 12PM. 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 Sunday (Mar 22) at 9AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Wed 18th Mar)3.5ft (1.1m) 7s
Best Surf 6AM (Wed 18th Mar)3.5ft (1.1m) 7s
Most Powerful12PM (Tue 17th Mar)10ft (3.0m) 8s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast Light rain (total 5mm), mostly falling on Mon afternoon. Very mild (max 15°C on Wed morning, min 5°C on Sun night). Winds decreasing (strong winds from the SSW on Mon night, light winds from the ENE by Wed morning).

Days 3-6 Weather Summary Mostly dry. Very mild (max 17°C on Wed afternoon, min 6°C on Sat morning). Wind will be generally light.

Sun
15
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Saturday
21
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.8
WSW
2.4
W
2
WSW
2.5
SW
3
SSW
3
SSW
2.5
SSW
1.7
SSW
0.9
SSW
0.7
SSW
0.3
SW
0.2
SSW
0.1
SW
0.1
SW
0.1
SW
0.2
SSW
0.2
SSW
0.3
SSW
0.2
SSW
0.2
SSW
0.3
SW
Period(s) (?)6767788777767798998109
Wave
Graph
(?)Metric surfscale
Energy kJ (?)26249230967082987676228684439422378167914
Wind
(km/h)
30
W
40
W
40
SW
45
SSW
40
S
45
S
35
S
20
SSE
10
ENE
5
NNE
5
E
5
ENE
5
NNE
5
E
5
SE
5
N
10
ENE
25
ENE
25
NE
20
ENE
25
ENE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		ononcross-
on		cross-
on		cross-
on		cross-
on		offglasscross-
off		cross-
off		glasscross-
off		glasscross-
off		cross-
off		offoffcross-
off		cross-
off
High Tide
/ height (m)
7:40PM
3.18
7:48AM
3.57
8:11PM
3.45
8:17AM
3.88
8:40PM
3.71
8:46AM
4.16
9:09PM
3.94
9:17AM
4.38
9:39PM
4.11
9:50AM
4.50
10:12PM
4.21
10:26AM
4.51
10:47PM
4.20
11:05AM
4.37
Low Tide
/ height (m)
1:55AM
0.94
2:23PM
0.60
2:32AM
0.63
2:58PM
0.26
3:07AM
0.35
3:33PM
-0.02
3:43AM
0.13
4:08PM
-0.20
4:20AM
-0.00
4:45PM
-0.25
4:59AM
-0.04
5:24PM
-0.15
5:39AM
0.04
Sun
15
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sunrise--6:31--6:28--6:26--6:24--6:20--6:18--6:16
Sunset6:21--6:22--6:23--6:25--6:28--6:30--6:31--
rain showers
rain showers
light rain
light rain
cloud
cloud
cloud
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
cloud
part cloud
clear
clear
part cloud
part cloud
Rain (mm)
1112-----------------
Temp. °C878991011111517161313131112117887
Feels °C (?)1-210115613161411111191080132
  • 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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View detailed surf forecast for Cable Bay (Porth Trecastell) at:
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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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