Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 6 Jul 2026:
- Most powerful swell: Monday 6 Jul, 10PM (local time) - 2.5ft (0.7m), 5s period, SW swell with 23 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 0.7m 5s and forecast to arrive on Monday (Jul 06) 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 1.4m 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 | 10PM (Mon 6th Jul) | 2.5ft (0.7m) 5s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Updates in hr min s Forecast update imminent
Alright mate, Rusty here. Let’s have a look at what’s cookin’ for the next couple of weeks.
Honestly, it’s a pretty grim stretch for Cable Bay (Porth Trecastell). The whole first week is a write-off, with nothing but tiny, weak, and messy conditions. You’re looking at a solid 10 days of flat or near-flat surf with poor conditions. The water is a touch warmer than normal at 60.3°, but that’s about the only positive.
Things start to stir a little around Thursday the 16th of July, but it’s still not worth getting excited about. The first real sign of life is on Friday the 17th of July morning. We get a modest SSW swell pushing 3ft, with a clean offshore wind from the NE. The energy is still weak (80), and the period is a short 6 seconds, so it’ll be a bit crumbly, but it’s the first surfable wave in over a week. The wind will be clean, but the quality is just ordinary.
The best chance of the whole period looks to be Monday the 20th of July. The swell picks up to 4.6ft from the SW, with a period of 7 seconds. The combined energy climbs into moderate territory (171), and the morning sees a light breeze from the N, keeping things clean. The wind state is cross-offshore, so it should be reasonably tidy. It’s not a world-beater, but it’s the standout window. The crowd at Cable Bay can be a problem sometimes, so expect some company.
By Tuesday the 21st of July, the swell holds at 4.9ft from the SW, but the wind swings onshore, making it a bit bumpy and less appealing. The energy is still moderate (154), but the quality will drop.
Overall, don’t hold your breath for the first ten days. The best bet is to target the morning of Monday the 20th of July for the cleanest, most consistent waves on offer.
Short Range ForecastMostly dry. Warm (max 20°C on Wed afternoon, min 14°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 22°C on Fri morning, min 14°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Mon 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | |||||||||||||||
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) | SSW 5 | SSW 5 | NW 4 | NW 4 | SW 4 | SSW 3 | — | — | S 11 | WNW 3 | — | — | N 3 | NNW 6 | NNW 6 | N 5 | N 5 | NE 5 | NE 4 | NE 4 | NE 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 14 | 21 | 16 | 4 | 3 | 1 | 0 | 0 | 3 | 1 | 0 | 0 | 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 | on | cross-on | on | on | cross-on | cross-on | on | cross-on | cross | cross | off | off | cross-off | cross-off | cross-off | off | off | off | off | off | off |
High Tide | 2:23AM3.59m | 2:59PM3.16m | 3:15AM3.47m | 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 | ||||||||
Low Tide | 8:52PM1.00m | 9:30AM0.79m | 9:42PM1.13m | 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 | ||||||||
 |  | |  |  | | | | | | | | | | | | | | | | | |
 | — | — | 4:58 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 |
 | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | 9:39 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 16 | 16 | 19 | 18 | 19 | 20 | 20 | 19 | 21 | 21 | 22 | 22 | 17 | 20 | 21 | 20 | 19 | 20 | 19 | 17 |
Feels °C | 14 | 14 | 14 | 17 | 16 | 19 | 19 | 20 | 18 | 20 | 21 | 20 | 20 | 14 | 18 | 19 | 17 | 15 | 16 | 15 | 12 |
Swell 1 Height (m) Direction Period (s) | WNW 3 | SSW 5 | NW 4 | NW 4 | S 12 | SSW 3 | — | — | S 11 | WNW 3 | — | — | — | — | NNW 6 | NW 5 | N 5 | — | — | — | — |
| kJ | 1 | 21 | 16 | 4 | 3 | 1 | — | — | 3 | 1 | — | — | — | — | 72 | 7 | 25 | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | SW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | S 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | NW 4 | — | SSW 3 | SW 4 | WNW 3 | — | — | WNW 3 | NNW 3 | — | — | N 3 | NNW 6 | — | N 5 | NE 5 | NE 5 | NE 4 | NE 4 | NE 3 |
| kJ | 14 | 3 | — | 3 | 3 | 1 | — | — | 1 | 1 | — | — | 4 | 97 | — | 45 | 17 | 14 | 20 | 12 | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 260 | 261 | 244 | 412 | 256 | 246 | 283 | 246 | 178 | 243 | 233 | 176 | 180 | 233 | 260 | 325 | 260 | 380 | 373 | 283 | 211 |
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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