Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 14 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 7PM (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 7PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Saturday (Jul 18) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, let’s talk Cable Bay (Porth Trecastell). I’m not gonna sugarcoat it, mate – the outlook is a tough one. We’ve got a long stretch of nothing to start, with the first real chance coming on the 22nd of July. That’s a long gap of quiet water.
From now until the 21st of July, it’s a flat spell. The swell is all but gone, and while the wind is often offshore, there’s no energy to push. The combined swell energy is stuck in the single digits or low teens – that’s a dead ocean. The water temp on the 14th is 62°, which is 4° warmer than the usual for this time of year, so it’s notably warm.
The 22nd of July morning brings a weak 0.3m (1ft) south swell, with a period of only 4 seconds. Light offshore wind from the NE will keep it clean, but it’s just small, messy slop. The combined energy is 2 (weak). Not worth the paddle.
The 25th of July morning is a bit better. A 0.4m (1ft) SSW swell, 7-second period, with clean cross-offshore winds from the NNW. The combined energy is 16 (weak). Still tiny, but it’s the pick of the litter. Sunday morning the 26th of July is the standout. The wind goes glassy, dead calm, and we get a 0.6m (2ft) WNW swell. The period is short at 4 seconds, so it’s windswell, but a glassy surface makes it the cleanest wave of the whole 16 days. The combined energy is 14 (weak). It’s a small day, but for a longboard or a soft top, it’s your best bet.
The 28th of July morning also has glassy conditions, with a 0.4m (1ft) SW swell and 6-second period. The energy is 9 (weak). Once again, tiny and clean.
The standout is the morning of the 26th of July. The glassy conditions and the 0.6m (2ft) swell (WNW) make it the only real window to get a clean ride. The 25th is next best. For the rest of the run, it’s flat or too small to bother. Crowds at Cable Bay can be “sometimes” a problem, but with this little swell, you’ll be alone.
Rusty
Short Range ForecastMostly dry. Warm (max 23°C on Wed morning, min 18°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 23°C on Fri morning, min 12°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | |||||||||||||||
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 18 | SW 18 | SW 14 | SW 16 | SW 16 | S 16 | SW 6 | SW 14 | SW 14 | SSW 6 | SSW 6 | SW 12 | S 11 | S 11 | S 11 | S 11 | S 10 | S 10 | N 5 | N 5 | N 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 12 | 7 | 10 | 10 | 7 | 1 | 8 | 8 | 4 | 6 | 6 | 2 | 2 | 2 | 2 | 2 | 2 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | off | cross | cross-off | cross-off | cross-off | cross-off | off |
High Tide | 10:03PM4.26m | 10:35AM4.00m | 10:51PM4.43m | 11:24AM3.99m | 11:39PM4.50m | 12:11PM3.90m | 00:25AM4.44m | 12:58PM3.76m | 1:12AM4.25m | 1:45PM3.57m | 2:00AM3.97m | 2:34PM3.37m | 2:51AM3.65m | ||||||||
Low Tide | 4:35PM0.16m | 5:04AM-0.20m | 5:21PM0.05m | 5:52AM-0.33m | 6:06PM0.03m | 6:39AM-0.31m | 6:51PM0.12m | 7:25AM-0.16m | 7:35PM0.30m | 8:10AM0.10m | 8:19PM0.55m | 8:56AM0.43m | 9:06PM0.83m | ||||||||
 | |  | | | | | |  |  | | | | | | | | |  | | | |
 | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — |
 | — | — | 9:38 | — | — | 9:37 | — | — | 9:37 | — | — | 9:36 | — | — | 9:34 | — | — | 9:32 | — | — | 9:31 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 21 | 21 | 23 | 23 | 23 | 23 | 23 | 20 | 23 | 22 | 18 | 16 | 18 | 16 | 18 | 18 | 16 | 14 | 17 | 19 |
Feels °C | 14 | 16 | 16 | 21 | 19 | 20 | 20 | 19 | 17 | 20 | 18 | 16 | 13 | 15 | 14 | 16 | 15 | 13 | 10 | 14 | 17 |
Swell 1 Height (m) Direction Period (s) | S 18 | SW 18 | S 7 | S 6 | SW 6 | SSW 6 | N 4 | S 6 | SW 7 | NNW 3 | SSW 6 | SW 6 | SW 6 | SW 6 | S 11 | S 11 | S 10 | S 10 | — | — | NNW 3 |
| kJ | 6 | 12 | 1 | 1 | 2 | 4 | 1 | 1 | 2 | 2 | 4 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | — | — | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | SW 14 | SW 16 | SW 16 | SW 13 | SW 6 | SW 14 | SW 12 | SSW 6 | SW 12 | SW 12 | S 11 | S 11 | S 5 | — | — | — | — | — | — |
| kJ | — | — | 7 | 10 | 10 | 7 | 1 | 8 | 6 | 4 | 6 | 6 | 2 | 2 | 1 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 14 | — | — | S 13 | S 13 | S 16 | — | S 7 | SW 14 | S 12 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 4 | — | — | 3 | 3 | 5 | — | 1 | 8 | 3 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 4 | NE 4 | NE 4 | NE 4 | NNE 4 | — | NNE 3 | NNE 3 | — | NNW 3 | N 4 | NNW 5 | NNW 5 | N 5 | N 5 | N 4 | N 4 | N 5 | N 5 | N 4 |
| kJ | 8 | 15 | 11 | 6 | 11 | 9 | — | 4 | 3 | — | 3 | 7 | 35 | 42 | 42 | 17 | 11 | 17 | 24 | 15 | 9 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 178 | 211 | 294 | 322 | 373 | 300 | 329 | 211 | 260 | 329 | 332 | 284 | 284 | 284 | 272 | 295 | 277 | 284 | 387 | 282 | |
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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