Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 8 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 1PM (local time) - 0.5ft (0.1m), 18s period, SW swell with 12 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 0.1m 18s and forecast to arrive on Tuesday (Jul 14) at 1PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 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 | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Right, let’s be straight with you – there’s nothing on the horizon. The entire 16-day outlook is a flat spell.
For the whole stretch up to the 23rd of July, it’s a total write-off. Swell energy numbers are all under 100, which tells you the gas tank is empty. We’re looking at waves barely reaching 1 foot, coming from the south and southwest, with no consistency or power. Even though we get clean offshore winds from the northeast at times, and even a glassy calm on the afternoon of the 19th, there’s simply no wave to ride.
The only break in the game is Cable Bay (Porth Trecastrell). It’s a fairly consistent spot that needs a solid SW swell, but that swell just isn’t coming. For most of this period, with a bit of wind, it’d be more of a kiteboarding setup than a surf spot.
There’s no best day, no standout session. It’s one of those quiet spells that can happen here. Don’t lose hope – forecasts can flip – but for now, the ocean’s taking a break. I’d say hang up the board for a bit.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Fri afternoon, min 16°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sat afternoon. Warm (max 24°C on Sat morning, min 14°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
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) | — | — | — | S 11 | WNW 3 | — | NNE 2 | N 3 | W 11 | NNW 6 | N 5 | NE 5 | SSE 4 | NE 4 | NE 5 | NE 5 | S 19 | S 15 | S 18 | SW 18 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 3 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 7 | 8 | 6 | 12 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross | cross | off | off | cross-off | cross-off | off | off | off | off | off | off | off | off | off | cross-off | off | off |
High Tide | 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 | 9:43AM3.93m | 10:03PM4.26m | ||||||||
Low Tide | 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 | 4:14AM0.05m | 4:35PM0.16m | ||||||||
 | |  |  | | | | | |  | |  | | | | | | | | | | |
 | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — |
 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 |
mm | — | — | — | — | — | — | — | — | — | 1 | 3 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 20 | 19 | 18 | 20 | 19 | 22 | 23 | 18 | 24 | 20 | 18 | 19 | 20 | 18 | 18 | 20 | 20 | 22 | 23 | 24 |
Feels °C | 19 | 20 | 18 | 17 | 19 | 18 | 20 | 21 | 16 | 24 | 17 | 12 | 14 | 15 | 11 | 14 | 15 | 14 | 19 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | — | — | — | S 11 | — | — | — | — | — | NNW 6 | NW 5 | NNW 5 | — | — | — | N 4 | S 19 | S 15 | S 18 | SW 18 | SW 14 |
| kJ | — | — | — | 3 | — | — | — | — | — | 43 | 7 | 7 | — | — | — | 1 | 7 | 4 | 6 | 12 | 7 |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 11 | — | — | — | — | W 11 | — | — | — | SSE 4 | — | — | — | — | SW 15 | — | — | SW 14 |
| kJ | — | — | — | 3 | — | — | — | — | 2 | — | — | — | 1 | — | — | — | — | 8 | — | — | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | NE 6 | — | — | NE 6 | S 15 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | 4 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | WNW 3 | WNW 3 | — | NNE 2 | N 3 | N 5 | ENE 4 | N 5 | NE 5 | NE 5 | NE 4 | NE 5 | NE 5 | NE 4 | NE 5 | NE 5 | NE 4 | NE 4 |
| kJ | — | — | — | 2 | 1 | — | 1 | 5 | 59 | 1 | 22 | 21 | 15 | 26 | 25 | 22 | 26 | 21 | 10 | 21 | 14 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 246 | 302 | 256 | 233 | 286 | 233 | 158 | 172 | 233 | 258 | 272 | 258 | 298 | 313 | 298 | 211 | 339 | 294 | 259 | 158 | 297 |
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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