
Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 12 Jul 2026:
- Most powerful swell: Thursday 16 Jul, 4PM (local time) - 1.5ft (0.4m), 7s period, SW swell with 14 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 0.4m 7s and forecast to arrive on Thursday (Jul 16) at 4PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Sunday (Jul 12) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Thu 16th Jul) | 1.5ft (0.4m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Rusty here. Let me level with you – this forecast for the next couple of weeks at Cable Bay is a tough pill to swallow. We’re looking at a real dry spell, my friend.
The water temperature is a touch warmer than normal for the time of year, sitting at 62°F, so that’s a small comfort if you’re keen for a swim, but for surfing? The pickings are as slim as they come.
We start off with absolutely nothing on Sunday the 12th and Monday the 13th. Just clean, offshore wind but flat as a pancake – combined energy of all swells directed here at 0. Tuesday the 14th and Wednesday the 15th whisper a tiny bit of life, with a 0.3ft swell coming from the south, but with a long period around 16-19 seconds, it’s barely enough to wrinkle the surface. The energy is weak, registering just 7 to 14. You’d be fighting for a dribble.
Thursday the 16th and Friday the 17th see a slight bump to 0.7ft and 1ft, but the period drops to a pathetic 6-7 seconds – that’s short-period windswill. The combined energy climbs into the low 20s, but that’s still nothing to write home about. The winds are offshore or cross-off, keeping the surface clean, but there’s just no power in the water.
Now, Saturday morning the 18th is a glimmer of hope that breaks your heart. The swell is only 1ft from the SW with a 6-second period, but the wind goes glassy, dead calm (5 km/h from the NE). It’s a beautiful, clean morning, but the surf is still poor. The combined energy is a measly 11. It’s a day for a longboard and a lot of patience, or just a paddle.
Sunday the 19th through to Thursday the 24th of July is mostly a write-off. We get occasional tiny 0.3ft pulses, then nothing at all. The winds stay reasonable at times, but through the 22nd and 23rd it gets ugly with fresh to strong cross-onshore winds and rain, creating choppy, messy conditions. There’s a small increase on the 24th with a 2ft W swell, but it’s a 4-second period and onshore – total junk.
Finally, on Saturday the 25th and Sunday the 26th, we see a proper bump in size. Saturday afternoon brings a 6ft swell from the SSW, and Sunday morning holds a 5ft from the same direction. The combined energy jumps to 204 and 205, so there’s definitely moderate wave energy out there. But here’s the kicker – the period is a short 5-7 seconds, so it’s going to be a messy, blown-out affair. The winds for Saturday are onshore at 35 km/h, and Sunday stays strong cross-onshore. This is more of a kite-surfing show than a paddler’s paradise. A 6ft wave with that kind of wind is a battle.
Honestly, looking at the whole 16 days, there isn’t a single standout, not one session I’d recommend paddling out for. It’s a long, bleak run. Forecasts can change, but for now, save your wax and wait for the next system.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Tue afternoon, min 14°C on Mon night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Wed night, min 17°C on Fri night). Winds decreasing (fresh winds from the ENE on Thu night, calm by Fri night). | ||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
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) | NE 5 | NE 4 | NE 5 | NE 4 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | SSW 7 | SSW 6 | SW 7 | SW 7 | SW 7 | SW 6 | SW 6 | SW 6 | SW 6 | SSW 6 |
Wave Graph | |||||||||||||||||||||
0 | 0 | 0 | 0 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 7 | 4 | 14 | 12 | 11 | 10 | 10 | 9 | 8 | 5 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | off | off | off | off | off | cross-off | cross-off | off | cross-off | cross-off | cross-off | off | off | cross-off | glassy | glassy | cross-off | off |
High Tide | 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 | 12:11PM3.90m | 00:25AM4.44m | 12:58PM3.76m | 1:12AM4.25m | ||||||||
Low Tide | 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 | 6:39AM-0.31m | 6:51PM0.12m | 7:25AM-0.16m | 7:35PM0.30m | ||||||||
5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | |
— | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:37 | — | — | 9:36 | — | — | 9:34 | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 24 | 22 | 18 | 21 | 19 | 22 | 25 | 24 | 25 | 26 | 27 | 25 | 26 | 24 | 21 | 22 | 20 | 23 | 23 | 22 |
Feels °C | 19 | 19 | 18 | 12 | 16 | 13 | 18 | 20 | 19 | 24 | 22 | 22 | 24 | 24 | 18 | 20 | 19 | 18 | 20 | 19 | 21 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | S 19 | S 15 | S 18 | SW 18 | S 7 | S 6 | SW 6 | SSW 7 | SSW 6 | SW 7 | NE 5 | SW 7 | SW 6 | SW 6 | SW 6 | SW 6 | SSW 6 |
— | — | — | — | 7 | 4 | 6 | 12 | 1 | 1 | 1 | 4 | 4 | 14 | 9 | 11 | 10 | 10 | 9 | 8 | 3 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 14 | — | SW 16 | SW 13 | — | SW 14 | SW 7 | NNE 4 | NNE 4 | SW 12 | — | S 11 | SW 11 |
— | — | — | — | — | — | — | — | 7 | — | 10 | 7 | — | 8 | 12 | 2 | 1 | 6 | — | 2 | 5 | |
Swell 3 Height (m) Direction Period (s) | NE 5 | — | — | — | — | — | W 14 | — | SW 14 | SW 16 | S 13 | — | SW 8 | — | N 5 | SSW 3 | SW 12 | — | S 11 | — | — |
1 | — | — | — | — | — | 4 | — | 7 | 10 | 3 | — | 3 | — | 4 | 1 | 6 | — | 2 | — | — | |
Wind waves Height (m) Direction Period (s) | NE 5 | NE 4 | NE 5 | NE 4 | NNE 4 | NE 4 | NE 4 | NNE 4 | NE 5 | NE 5 | NE 4 | ENE 5 | NE 5 | NE 4 | SSE 3 | — | — | — | — | N 3 | N 3 |
17 | 32 | 25 | 31 | 32 | 17 | 21 | 42 | 39 | 13 | 22 | 32 | 14 | 10 | 2 | — | — | — | — | 1 | 3 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 297 | 211 | 306 | 307 | 307 | 294 | 178 | 158 | 298 | 211 | 211 | 329 | 158 | 158 | 318 | 329 | 345 | 329 | 423 | 935 | 326 |
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.










