Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 10 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 10AM (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 10AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 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 | 10AM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Alright, folks, Rusty here. Let’s have a look at what’s going on for the next couple of weeks. Straight up, I gotta be honest with you – this is gonna be a tough stretch. We’re looking at a long, dry spell before anything even thinks about showing up.
For the first week and a half, from now right through until the 20th of July, it’s flat. Totally flat. The waves are basically a no-show. We’ve got clear skies and some decent offshore winds through a lot of it, which is a real kick in the teeth – all that clean, glassy potential with nothing to ride. That’s just the way it goes sometimes.
Then things start to stir. The first tiny pulses of swell creep in around the 21st of July, but it's weak and sloppy. Short-period windswell, mostly from the west and southwest, with a lot of cross-onshore and onshore wind. The wave energy is dismal, barely cracking a moderate reading on the 21st morning. That's not surf, that's a washing machine.
The best bet in this whole outlook is the morning of the 25th of July. That Saturday, we finally see a bump in size. Swell heights hit around 4ft from the southwest, with period stretching to 7 seconds. The combined energy gets up to a moderate 109. Now, the winds are cross-onshore from the WNW at 15 mph, so it'll be a bit lumpy, but it's the biggest we've seen. At Cable Bay (Porth Trecastell), this is the one to set your alarm for. The water's running about a touch warmer than normal for the time of year, if you were wondering.
It’s not a perfect day by any stretch, but after all that flatness, it’s the only game in town. Ride what you can, where you find it.
Stay salty.
– Rusty
Short Range ForecastMostly dry. Warm (max 24°C on Sat morning, min 14°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Tue night, min 16°C on Mon morning). Mainly fresh winds. | ||||||||||||||||||||
Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | |||||||||||||||
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) | NNE 2 | NNW 3 | N 5 | NNW 5 | NNW 5 | NE 4 | NE 5 | NE 4 | NE 5 | NE 5 | S 19 | S 15 | S 18 | SW 18 | SSW 7 | SW 16 | SW 16 | S 16 | SW 14 | SW 14 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 4 | 12 | 12 | 7 | 10 | 10 | 5 | 8 | 8 | 8 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | glassy | off | cross-off | off | off | off | off | off | off | off | off | cross-off | off | off | cross-off | cross-off | cross-off | off |
High Tide | 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 | 11:24AM3.99m | 11:39PM4.50m | ||||||||
Low Tide | 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 | 5:52AM-0.33m | 6:06PM0.03m | ||||||||
 | |  | | |  | | | | | | | |  | | | | | | | | |
 | 5:01 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — |
 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:37 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 23 | 20 | 24 | 24 | 22 | 22 | 23 | 21 | 20 | 21 | 22 | 22 | 22 | 25 | 23 | 25 | 25 | 25 | 26 | 23 |
Feels °C | 22 | 22 | 18 | 25 | 23 | 19 | 19 | 19 | 16 | 15 | 16 | 18 | 17 | 17 | 20 | 23 | 23 | 20 | 24 | 24 | 19 |
Swell 1 Height (m) Direction Period (s) | — | — | — | NNW 5 | NNW 5 | NNW 4 | — | — | — | — | S 19 | S 15 | S 18 | S 7 | SSW 7 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SW 6 |
| kJ | — | — | — | 37 | 13 | 6 | — | — | — | — | 7 | 4 | 6 | 1 | 5 | 4 | 4 | 3 | 3 | 4 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NE 6 | — | — | — | SW 18 | SW 14 | SW 16 | SW 16 | S 13 | — | SW 14 | S 12 |
| kJ | — | — | — | — | — | — | — | — | — | 1 | — | — | — | 12 | 7 | 10 | 10 | 3 | — | 8 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | S 15 | — | SW 18 | — | SW 14 | S 13 | S 13 | S 16 | SW 14 | — | SW 14 |
| kJ | — | — | — | — | — | — | — | — | — | — | 4 | — | 12 | — | 7 | 3 | 3 | 5 | 8 | — | 8 |
Wind waves Height (m) Direction Period (s) | NNE 2 | NNW 3 | N 5 | — | NE 4 | NE 4 | NE 5 | NE 4 | NE 5 | NE 5 | NE 5 | NE 5 | NE 4 | NNE 4 | NE 4 | NE 4 | NE 4 | NE 4 | NE 4 | NE 4 | NE 4 |
| kJ | 1 | 3 | 51 | — | 5 | 9 | 21 | 31 | 29 | 30 | 47 | 21 | 20 | 12 | 14 | 9 | 9 | 9 | 4 | 12 | 10 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 172 | 172 | 180 | 258 | 256 | 258 | 297 | 313 | 306 | 414 | 313 | 272 | 259 | 158 | 297 | 298 | 298 | 327 | 221 | 211 | 317 |
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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