Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 16 Jul 2026:
- Most powerful swell: Thursday 16 Jul, 10PM (local time) - 0.5ft (0.1m), 15s period, SW swell with 8 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 15s and forecast to arrive on Thursday (Jul 16) at 10PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s 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 | 10PM (Thu 16th Jul) | 0.5ft (0.1m) 15s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Right, let’s take a look at what’s on offer. I’m gonna be straight with you – this is a rough run for Cable Bay (Porth Trecastrell). The next 16 days are looking pretty bleak, with barely a ripple worth getting wet for. The first week and a half is a write-off, filled with tiny, weak swell and poor surf conditions. The water temp is sitting at 63°, which is 4° warmer than usual for this time of year – that’s notable, but it’s not going to help the waves.
The first real sign of any life doesn’t show up until Tuesday the 28th afternoon, when we see a pulse of 5 ft swell from the SSW, with a period of 6 seconds. That’s short-period windswell, with moderate energy (148). That’s big enough to be a handful for beginners, but it’s not going to be anything special. It’s clean with cross-off winds from the NNW at 12 mph, but the quality is still poor. The following mornings are onshore and messy.
Looking further ahead, Wednesday the 30th has some swell, but it’s getting blown out by strong onshore winds, making it lumpy and messy. Honestly, there’s not a single standout session in the whole 16-day window. The overall energy is weak, and the consistency is poor. For a spot that’s exposed to SW swell, this is a dry spell. It might get interesting for kite surfers when the wind picks up, but for paddle surfing, there’s nothing to get excited about.
Keep an eye on the forecasts, though – it tends not to stay this flat forever.
Rusty
Short Range ForecastMostly dry. Warm (max 21°C on Thu morning, min 12°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Sun afternoon, min 12°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | |||||||||||||||
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) | SW 14 | SW 14 | SSW 7 | SSW 6 | SSW 6 | SW 12 | S 11 | S 11 | S 11 | S 11 | S 10 | S 10 | NNW 5 | NNW 5 | NNW 5 | N 5 | NNW 4 | N 4 | N 5 | NNW 5 | NNW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 8 | 8 | 4 | 6 | 6 | 2 | 2 | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 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 | 3:28PM3.18m | 3:49AM3.33m | 4:30PM3.04m | ||||||||
Low Tide | 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 | 9:44AM0.78m | 9:59PM1.11m | 10:38AM1.10m | 11:03PM1.32m | ||||||||
 |  |  | | |  | | | | | | | | | | | | | | | | |
 | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:18 | — | — |
 | — | — | 9:37 | — | — | 9:36 | — | — | 9:34 | — | — | 9:32 | — | — | 9:31 | — | — | 9:30 | — | — | 9:29 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 21 | 20 | 20 | 21 | 19 | 14 | 18 | 18 | 17 | 18 | 16 | 14 | 18 | 17 | 15 | 17 | 15 | 15 | 16 | 15 |
Feels °C | 21 | 20 | 17 | 18 | 16 | 16 | 10 | 15 | 15 | 15 | 14 | 13 | 10 | 15 | 15 | 13 | 15 | 13 | 9 | 11 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | SSW 7 | SSW 6 | SSW 6 | SW 6 | SW 6 | SW 6 | N 5 | S 11 | S 10 | S 10 | — | — | — | N 5 | — | — | — | — | — |
| kJ | 1 | 1 | 5 | 4 | 4 | 1 | 1 | 1 | 17 | 2 | 2 | 2 | — | — | — | 15 | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | SW 14 | SW 12 | S 12 | SW 12 | SW 12 | S 11 | S 11 | S 11 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 8 | 6 | 3 | 6 | 6 | 2 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SW 14 | SW 7 | SW 14 | — | — | — | — | — | S 5 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 8 | 2 | 8 | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | NNE 3 | NNE 3 | N 4 | N 4 | N 4 | NNW 6 | NNW 6 | — | NNW 4 | NNW 4 | N 4 | NNW 5 | NNW 5 | NNW 5 | — | NNW 4 | N 4 | N 5 | NNW 5 | NNW 6 |
| kJ | — | 1 | 2 | 7 | 10 | 17 | 104 | 126 | — | 6 | 4 | 13 | 35 | 19 | 24 | — | 5 | 5 | 27 | 35 | 130 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 212 | 211 | 233 | 329 | 284 | 332 | 284 | 261 | 284 | 284 | 277 | 284 | 387 | 260 | 300 | 352 | 277 | 1023 | 393 | 233 | |
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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