Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 4 Jul 2026:
- Most powerful swell: Sunday 5 Jul, 4AM (local time) - 2.5ft (0.8m), 6s period, SW swell with 36 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 6s and forecast to arrive on Sunday (Jul 05) at 4AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Saturday (Jul 11) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Sun 5th Jul) | 2.5ft (0.8m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, fellow surfers, Rusty here. Gotta be straight with you – it’s gonna be a long, quiet wait for any proper waves at Cable Bay (Porth Trecastell).
Right now, and for the foreseeable future, there’s just nothing doing. The water is sitting at about 61°, which is a touch warmer than normal for this time of year, but you won’t care about that because there’s no surf to enjoy it in. The combined swell energy is basically zero (0-41), with weak, short-period windswell and a chop that’s just not worth paddling out into. It’s all "poor surf conditions" on the charts.
You’re looking at a solid, silent run of flatness. From Saturday the 4th right through to Saturday the 18th of July, there’s nothing that could even be called a wave. A few mornings might glass off, like Wednesday the 8th or Friday the 10th, but with no swell to speak of, it’s just a flat, oily ocean. There’s a tiny blip of a long-period south swell around Tuesday the 14th and Wednesday the 15th, but at 0.3 ft and with onshore or cross-onshore winds, it’s a tease, not a session.
The best of a bad lot, and I mean that lightly, is Thursday morning the 9th of July. It’s the only time we get a clean, offshore wind (NNE at 9 mph) with any swell at all – a tiny 0.3 ft south groundswell with an 11-second period. The combined energy is only 3, so it’s whisper-thin, but if you’re desperate for a clean, empty lineup and a longboard, that’s your only window. It’s not a standout by any stretch, it’s just the least poor.
After that, the second week is just more of the same – mostly flat, variable winds, and no energy. Honestly, the whole 16-day stretch looks more interesting for a kayak than a surfboard. Forecasts can change though, so don't give up hope just yet.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Sat afternoon, min 15°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Thu morning, min 18°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Sat 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SW 5 | WSW 5 | SW 4 | SW 4 | SW 4 | NW 4 | SSW 3 | SSW 4 | NW 4 | NW 4 | S 12 | — | — | — | S 11 | — | NNE 2 | S 10 | WNW 3 | N 5 | NNW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 41 | 33 | 10 | 10 | 14 | 4 | 3 | 13 | 8 | 2 | 3 | 0 | 0 | 0 | 3 | 0 | 0 | 2 | 1 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | cross-on | cross-on | on | on | cross-on | glassy | cross-on | off | off | off | off | glassy | cross-on | cross-off | cross-off |
High Tide | 1:02AM3.78m | 1:25PM3.28m | 1:39AM3.69m | 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 | ||||||||
Low Tide | 7:31PM0.73m | 8:04AM0.60m | 8:10PM0.86m | 8:45AM0.69m | 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 | ||||||||
 |  | | |  | | | | |  | | | | | | | | | | | | |
 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 |
 | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | 9:42 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 19 | 17 | 19 | 19 | 17 | 18 | 17 | 18 | 20 | 19 | 20 | 21 | 21 | 23 | 23 | 19 | 20 | 22 | 20 | 21 |
Feels °C | 18 | 18 | 15 | 17 | 18 | 15 | 15 | 16 | 16 | 17 | 17 | 20 | 21 | 21 | 21 | 21 | 17 | 20 | 22 | 19 | 19 |
Swell 1 Height (m) Direction Period (s) | — | — | NW 4 | — | — | NW 4 | WNW 3 | SSW 4 | NW 4 | NW 4 | S 12 | — | — | — | S 11 | — | — | S 10 | — | — | — |
| kJ | — | — | 4 | — | — | 3 | 1 | 13 | 8 | 2 | 3 | — | — | — | 3 | — | — | 2 | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | NW 4 | — | — | NW 4 | — | — | SW 4 | — | S 12 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 2 | — | — | 2 | — | — | 4 | — | 3 | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 5 | WSW 5 | SW 4 | SW 4 | SW 4 | SW 4 | SSW 3 | WNW 3 | — | SSW 4 | SSW 3 | — | — | — | — | — | NNE 2 | WNW 3 | WNW 3 | N 5 | NNW 6 |
| kJ | 41 | 33 | 10 | 10 | 14 | 4 | 3 | 1 | — | 2 | 2 | — | — | — | — | — | 1 | 1 | 1 | 50 | 50 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 412 | 185 | 185 | 299 | 294 | 302 | 261 | 261 | 261 | 350 | 246 | 246 | 246 | 246 | 246 | 320 | 246 | 158 | 172 | 180 | 178 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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