Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 7 Jul 2026:
- Most powerful swell: Tuesday 7 Jul, 7AM (local time) - 2.5ft (0.7m), 4s period, NW swell with 19 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 0.7m 4s and forecast to arrive on Tuesday (Jul 07) at 7AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s 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 | 7AM (Tue 7th Jul) | 2.5ft (0.7m) 4s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Updates in hr min s Forecast update imminent
Right then, let’s have a look at what’s on offer around Cable Bay (Porth Trecastell). I’ll be straight with you – the outlook for the next 16 days is a flat spell, no two ways about it. There’s simply no surf to get excited about. The water temp is sitting about average for the time of year, nothing unusual there.
From Tuesday, July 7th, right through until Wednesday, July 22nd, we’re looking at a long, dry gap with no recommendations coming through. The swell energy barely registers – most days showing a combined energy of just 17 (weak) or less, often dropping to zero. There’s a tiny pulse of very long-period groundswell from the SW around the 14th and 15th, with a period of 16-18 seconds and energy up to 23 (still weak), but the wave height is a pathetic 0.3 ft. That’s not surf, that’s a lake ripple.
Even when the wind goes offshore – like the solid 19 mph NE offshore on Monday the 13th – there’s zero swell to work with. And on the 16th and 17th we get glassy conditions, but again, with 0.3 ft of swell it’s just a flat, clean ocean. For a spot that’s fairly consistent, this is a proper let-down. A setup like this, with no paddleable surf for days on end, is more normal for a sheltered area in a quiet spell, but it still stings.
The only tiny glimmer is right at the end, on Sunday July 19th morning, where it’s glassy and you might see a 0.7 ft ripple. But let’s be real, that’s not worth getting the board wet for.
It’s a blank run. Forecasts can change, but for now, save the wax.
Rusty
Short Range ForecastMostly dry. Warm (max 21°C on Thu afternoon, min 14°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 23°C on Fri morning, min 15°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | |||||||||||||||
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) | WNW 4 | NW 4 | S 12 | SSW 4 | — | — | S 11 | S 11 | — | NNE 3 | N 3 | N 5 | NNW 5 | N 5 | N 4 | NE 5 | NE 4 | NE 4 | NE 3 | NNE 4 | S 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 12 | 3 | 3 | 1 | 0 | 0 | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | on | cross-on | cross | cross | off | off | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | off | off | off | off |
High Tide | 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 | 8:48AM3.79m | 9:12PM4.02m | ||||||||
Low Tide | 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 | 3:45PM0.34m | ||||||||
 |  |  | | | | | | | | |  | | | | | | | | | | |
 | 4:58 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — |
 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 19 | 18 | 19 | 20 | 20 | 19 | 21 | 20 | 23 | 23 | 18 | 21 | 21 | 22 | 21 | 21 | 19 | 18 | 21 | 20 |
Feels °C | 13 | 17 | 17 | 19 | 20 | 20 | 18 | 20 | 19 | 21 | 20 | 16 | 20 | 19 | 20 | 19 | 18 | 13 | 13 | 16 | 14 |
Swell 1 Height (m) Direction Period (s) | WNW 4 | NW 4 | S 12 | SSW 4 | — | — | S 11 | — | — | — | — | — | NNW 5 | — | N 4 | NNW 4 | — | — | — | — | S 15 |
| kJ | 12 | 3 | 3 | 1 | — | — | 3 | — | — | — | — | — | 29 | — | 12 | 2 | — | — | — | — | 4 |
Swell 2 Height (m) Direction Period (s) | SW 4 | — | — | — | — | — | — | S 11 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 5 | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NE 5 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SSW 3 | SW 3 | — | — | — | — | — | — | NNE 3 | N 3 | N 5 | — | N 5 | — | NE 5 | NE 4 | NE 4 | NE 3 | NNE 4 | NE 3 |
| kJ | — | 3 | 3 | — | — | — | — | — | — | 1 | 5 | 51 | — | 11 | — | 6 | 15 | 17 | 3 | 11 | 4 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 244 | 244 | 260 | 246 | 302 | 246 | 233 | 243 | 233 | 158 | 232 | 246 | 263 | 264 | 258 | 297 | 298 | 283 | 414 | 306 | 294 |
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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