Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 9 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 1.1m 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 | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
G’day, Rusty here, and I’ve got to be straight with you – the outlook for Cable Bay (Porth Trecastell) over the next 16 days is a flat spell of bummers. We’re looking at a long drought of real surf, so don’t be in a rush to grab your board.
The water temp is sitting around 60°, which is a touch warmer than normal for this time of year, but that’s about the only thing that’s even slightly interesting. The whole forecast period kicks off with nothing worth paddling out for. From Thursday the 9th right through to Wednesday the 22nd, it’s a total write-off – days and days of tiny, gutless waves or zero swell at all. The combined energy is mostly laughable, with values like 7 (weak), 2, or 0 (zero). The wind is often offshore, but without any real swell to work with, it’s just a clean, flat lake.
There’s a tiny glimmer way out on Wednesday the 22nd afternoon, when a bit of swell shows up: 3 ft from the WNW with a period of only 4 seconds – that’s a short, weak windswell, with combined energy of 24 (still weak). It’s not gonna do much. Thursday the 23rd morning offers a glassy session with 2 ft from the NW, period 4 seconds, and energy of 18 (weak). The glassy wind is a nice touch, but the waves are too small and weak to get excited about. This place is a fairly consistent spot exposed to SW swells, so it tends not to stay this poor for long – forecasts can change. But for now, I’d call it a solid two-week stretch of nothing.
Rusty, signing off.
Short Range ForecastLight rain (total 5mm), mostly falling on Sat night. Warm (max 24°C on Sat morning, min 15°C on Thu morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Tue afternoon, min 15°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | |||||||||||||||
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 | — | N 3 | N 4 | N 5 | NNW 5 | NNW 5 | N 4 | NE 5 | NE 4 | NE 5 | NE 5 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | S 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | off | off | cross-off | cross-off | cross | off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | off | off | off | off | off | off |
High Tide | 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 | 10:35AM4.00m | 10:51PM4.43m | ||||||||
Low Tide | 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 | 5:04AM-0.20m | 5:21PM0.05m | ||||||||
 | |  | | |  |  | | | | | | | |  | | | |  |  | | |
 | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — |
 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 |
mm | — | — | — | — | — | 1 | — | — | 4 | — | — | — | — | — | — | — | — | — | 1 | 3 | 1 |
Temp °C | 16 | 20 | 18 | 22 | 23 | 21 | 24 | 24 | 22 | 21 | 22 | 22 | 20 | 21 | 22 | 22 | 24 | 24 | 23 | 24 | 23 |
Feels °C | 15 | 19 | 17 | 20 | 21 | 21 | 25 | 24 | 21 | 18 | 17 | 18 | 15 | 15 | 18 | 18 | 21 | 20 | 23 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 3 | WNW 3 | — | — | — | — | NNW 5 | NNW 5 | N 4 | — | — | — | — | S 19 | S 15 | S 18 | SW 18 | N 5 | SW 16 | SW 16 | SW 13 |
| kJ | 1 | 1 | — | — | — | — | 21 | 8 | 14 | — | — | — | — | 7 | 4 | 6 | 12 | 4 | 10 | 10 | 7 |
Swell 2 Height (m) Direction Period (s) | S 11 | SW 4 | — | — | — | — | NE 4 | — | — | — | — | — | NE 5 | — | — | — | — | SW 14 | S 13 | S 5 | S 16 |
| kJ | 3 | 1 | — | — | — | — | 1 | — | — | — | — | — | 1 | — | — | — | — | 7 | 3 | 1 | 5 |
Swell 3 Height (m) Direction Period (s) | S 11 | — | — | — | — | — | — | — | — | — | — | — | — | S 15 | — | ESE 3 | S 14 | S 6 | S 6 | S 13 | — |
| kJ | 3 | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | 1 | 4 | 1 | 1 | 3 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | N 3 | N 4 | N 5 | — | NE 4 | — | NE 5 | NE 4 | NE 5 | NE 5 | NE 4 | NE 5 | NE 5 | NE 4 | ENE 4 | NE 4 | NE 4 | NE 5 |
| kJ | — | — | — | 1 | 6 | 69 | — | 3 | — | 13 | 21 | 17 | 17 | 31 | 21 | 20 | 16 | 12 | 11 | 29 | 42 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 233 | 243 | 233 | 158 | 172 | 180 | 258 | 258 | 258 | 297 | 211 | 306 | 414 | 178 | 259 | 256 | 158 | 283 | 298 | 317 | 109 |
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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