Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 6 Jul 2026:
- Most powerful swell: Tuesday 7 Jul, 1AM (local time) - 2.5ft (0.8m), 5s period, SSW swell with 33 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 0.8m 5s and forecast to arrive on Tuesday (Jul 07) at 1AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Saturday (Jul 11) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Tue 7th Jul) | 2.5ft (0.8m) 5s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, let’s get straight into it. I’m looking at Cable Bay (Porth Trecastell) here, and honestly, the whole 16-day stretch is a tough one. The water's sitting at about 60°F, which is a touch warmer than normal for this time of year, but that’s about the only positive I can squeeze out of this forecast.
We start off Monday the 6th with barely a ripple – just 2ft of weak, short-period SW windswell and a combined energy of only 13, meaning it’s weak. Winds are onshore and messy, so it’s poor. Tuesday is more of the same: tiny swell, onshore wind, no good. Wednesday the 8th goes completely flat – zero energy, zero hope. Thursday the 9th shows a tiny 0.3ft swell from the south with an 11-second period, but with only 8 units of energy and light cross-shore wind, it’s not worth getting wet.
Friday the 10th through to Sunday the 13th? Flat. Absolutely flat. No swell registered, even with some clean offshore winds. That’s a real kicker – clean conditions but nothing to ride. Monday the 13th afternoon finally sees a blip: 0.3ft of long-period groundswell from the south, 19-second period, with a moderate offshore wind. But the energy is just 7, so it’s a whisper, not a wave.
From Tuesday the 14th right through to the end on Tuesday the 21st, it’s the same sad story: tiny 0.3ft to 3ft swells, mostly from the south or southwest, with periods all over the place but very little power. The best combined energy we see is 34 on Friday the 17th afternoon, but that’s with a 2ft, 6-second windswell and cross-offshore winds – it’s still poor.
Honestly, there isn’t a single standout day here. The swell never gets above 3ft, the energy is weak throughout, and even when the wind goes offshore, there’s just nothing to push. If you’re desperate, the cleanest windows are the offshore wind days around the 11th and 12th, but with zero swell, you’re just looking at flat, glassy water.
For a spot that’s fairly consistent, this is a rough run. But don’t lose hope – forecasts can change, and it tends not to stay this poor for long. Keep an eye on it.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Tue afternoon, min 14°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Sat night. Warm (max 23°C on Fri morning, min 12°C on Fri night). Winds increasing (light winds from the WNW on Thu morning, fresh winds from the NE by Sat night). | ||||||||||||||||||||
Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | SW 4 | SSW 3 | SSW 5 | WNW 4 | NW 4 | S 12 | — | — | SW 3 | S 11 | NW 3 | NE 2 | NNE 3 | N 4 | N 6 | NNW 5 | NE 5 | NE 6 | NE 5 | NE 5 | NE 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 9 | 7 | 33 | 12 | 4 | 3 | 0 | 0 | 1 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | on | cross-on | on | on | cross-on | cross | cross-off | off | off | cross-off | cross-off | off | off | off | cross-off | off | off |
High Tide | 2:08PM3.22m | 2:23AM3.59m | 2:59PM3.16m | 3:15AM3.47m | 4:00PM3.13m | 4:19AM3.39m | 5:08PM3.17m | 5:31AM3.38m | 6:16PM3.29m | 6:42AM3.46m | 7:20PM3.49m | 7:48AM3.62m | 8:18PM3.75m | ||||||||
Low Tide | 8:52PM1.00m | 9:30AM0.79m | 9:42PM1.13m | 10:22AM0.89m | 10:42PM1.21m | 11:26AM0.95m | 11:55PM1.20m | 12:38PM0.92m | 1:12AM1.03m | 1:49PM0.78m | 2:21AM0.73m | 2:51PM0.57m | 3:21AM0.38m | ||||||||
 | |  | |  |  | | | | | | | | | | |  |  | | | | |
 | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:05 | — | — |
 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 8 | — | — | — |
Temp °C | 17 | 18 | 16 | 17 | 20 | 19 | 20 | 20 | 20 | 19 | 21 | 20 | 23 | 22 | 15 | 18 | 21 | 19 | 22 | 22 | 24 |
Feels °C | 14 | 15 | 14 | 15 | 18 | 18 | 20 | 19 | 20 | 18 | 21 | 19 | 22 | 20 | 11 | 15 | 18 | 15 | 22 | 21 | 21 |
Swell 1 Height (m) Direction Period (s) | NW 4 | WNW 3 | SSW 5 | WNW 4 | NW 4 | S 12 | — | — | — | S 11 | WNW 3 | — | — | — | N 6 | NNW 5 | NNW 5 | NNE 5 | — | — | — |
| kJ | 4 | 1 | 33 | 12 | 4 | 3 | — | — | — | 3 | 1 | — | — | — | 114 | 23 | 5 | 17 | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | SW 4 | — | — | — | — | — | S 11 | — | — | — | — | — | NE 5 | — | — | — | — | — |
| kJ | — | — | — | 5 | — | — | — | — | — | 3 | — | — | — | — | — | 6 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NE 5 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 4 | SSW 3 | WNW 4 | — | SSW 3 | SW 3 | — | — | SW 3 | WNW 3 | NW 3 | NE 2 | NNE 3 | N 4 | — | — | NE 5 | NE 6 | NE 5 | NE 5 | NE 5 |
| kJ | 9 | 7 | 5 | — | 3 | 3 | — | — | 1 | 2 | 1 | 1 | 1 | 12 | — | — | 8 | 50 | 26 | 41 | 38 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 261 | 261 | 294 | 244 | 363 | 256 | 246 | 258 | 246 | 258 | 258 | 246 | 158 | 180 | 233 | 260 | 264 | 296 | 297 | 211 | 283 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Cable Bay (Porth Trecastell) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest