Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 2 Jul 2026:
- Most powerful swell: Friday 3 Jul, 10PM (local time) - 4ft (1.2m), 6s period, SW swell with 88 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 1.2m 6s and forecast to arrive on Friday (Jul 03) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 4s period and expected on Friday (Jul 03) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Fri 3rd Jul) | 4ft (1.2m) 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 folks, Rusty here. Gotta be straight with you – it’s a tough watch for the next couple of weeks at Cable Bay (Porth Trecastrell). The forecast is a long, flat spell with only a few tiny glimmers that aren't really worth paddling out for.
Right now, and for the next few days, it’s all small, weak, and messy. Thursday afternoon we’ve got a tiny 2ft SW swell, but it’s being chopped up by a 12 mph cross-shore wind. The wave energy is a feeble 74, and the water is a very warm 61°, which is much warmer than normal for this time of year. It’s just poor surf conditions. Friday and Saturday see a bit more size, with Saturday morning pushing 4ft from the SW, but that’s onshore and lumpy, with a combined energy of 65. Not what you want.
Then we hit a real dry spell. From Sunday, July 6th, right through to Wednesday, July 16th, it’s basically flat. There are days with absolutely zero swell energy in the water. You’ll see a few tiny bumps of 0.3ft showing up mid-week, but they’re on long-period groundswell (14 to 18 seconds), which is too straight for a beach break and not enough push to actually ride. The wind is often clean or offshore, but there’s just nothing to catch.
The only real hope is Friday, July 17th, and it’s a long way off. That morning we finally see a little pulse of 2ft from the WNW, and it’s glassy. The combined energy jumps to 23, which is still weak, but it’s the best we’ll see. By the afternoon, it’s a 2ft WSW swell with a clean offshore wind. That’s the standout window, but it’s over a week away, so keep your fingers crossed. For now, the board stays in the car.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sat afternoon, min 14°C on Thu night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 22°C on Wed morning, min 16°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thu 2 | Friday 3 | Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | |||||||||||||||
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 7 | SW 6 | SW 5 | SSW 4 | SW 6 | SW 5 | SW 5 | SW 5 | SW 4 | SW 4 | SSW 4 | SW 5 | SW 3 | SW 4 | WNW 4 | NW 3 | S 12 | — | — | — | S 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 38 | 9 | 4 | 16 | 59 | 63 | 45 | 28 | 9 | 5 | 6 | 5 | 4 | 4 | 5 | 2 | 3 | 0 | 0 | 0 | 3 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross-on | cross-on | on | on | on | on | on | on | cross-on | cross-on | on | on | on | on | on | cross-off | cross-off | off | off |
High Tide | 11:54PM3.86m | 12:14PM3.41m | 00:28AM3.84m | 12:48PM3.35m | 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 | ||||||||
Low Tide | 6:18PM0.59m | 6:48AM0.47m | 6:54PM0.64m | 7:25AM0.52m | 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 | |||||||
 |  | | | | | | | |  |  | | | | | | | | | | | |
 | — | — | 4:56 | — | — | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:01 |
 | — | 9:47 | — | — | 9:46 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | 9:43 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 15 | 15 | 17 | 19 | 21 | 19 | 18 | 19 | 17 | 18 | 20 | 19 | 19 | 20 | 21 | 22 | 22 | 20 | 23 |
Feels °C | 12 | 14 | 11 | 9 | 16 | 15 | 18 | 17 | 16 | 17 | 15 | 15 | 17 | 17 | 17 | 19 | 20 | 20 | 20 | 17 | 22 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SW 6 | SW 5 | — | — | NW 4 | — | SW 5 | NW 4 | NW 4 | SSW 4 | NW 4 | WNW 3 | SW 4 | SSW 4 | NW 3 | S 12 | — | — | — | — |
| kJ | 36 | 9 | 4 | — | — | 2 | — | 28 | 4 | 2 | 6 | 4 | 1 | 4 | 2 | 2 | 3 | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | SW 7 | — | NNW 4 | — | — | — | — | — | — | SW 5 | — | — | — | — | SW 4 | — | — | — | — | — | S 11 |
| kJ | 38 | — | 1 | — | — | — | — | — | — | 1 | — | — | — | — | 3 | — | — | — | — | — | 3 |
Swell 3 Height (m) Direction Period (s) | — | SW 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 5 | NW 4 | W 3 | SSW 4 | SW 6 | SW 5 | SW 5 | WNW 4 | SW 4 | SW 4 | WNW 3 | SW 5 | SW 3 | — | WNW 4 | SSW 4 | WSW 3 | — | — | — | — |
| kJ | 28 | 7 | 1 | 16 | 59 | 63 | 45 | 16 | 9 | 5 | 1 | 5 | 4 | — | 5 | 2 | 1 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 172 | 173 | 256 | 261 | 299 | 412 | 185 | 261 | 299 | 270 | 302 | 333 | 261 | 302 | 352 | 256 | 233 | 287 | 233 | 246 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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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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