Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 3 Aug 2026:
- Most powerful swell: Wednesday 5 Aug, 1PM (local time) - 6ft (1.9m), 6s period, WSW swell with 275 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 1.9m 6s and forecast to arrive on Wednesday (Aug 05) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Thursday (Aug 06) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Wed 5th Aug) | 6ft (1.9m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, let's have a look at what's cookin'. Rusty here, and I've got to tell you, the crystal ball is showing a pretty flat picture for a long stretch. We've got a 16-day window, and honestly, the first week or so is going to test your patience. There's no proper swell on the horizon for a good while, and what little shows up is either tiny or blown to bits.
We start on Monday, August 3rd, and it's a bit of a non-starter. The surf is tiny, maybe 2ft at best from the SE with a short, weak period of just 4 seconds. The combined energy is barely a whisper (11). The morning starts glassy, which is a cruel tease, but the water is a touch warmer than normal for this time of year at 62°. It's a flat spell, plain and simple.
Tuesday the 4th sees a bump in size to about 4ft from the SSW, but the wind is already up, a cross-onshore breeze that chops it up. It's a no-go.
Wednesday the 5th is the only period that offers any kind of real size, with a solid 6ft swell from the WSW. The combined energy jumps up to moderate (209). But here's the kicker – we're looking at a strong, messy cross-onshore wind. The wave comment is "poor surf conditions". For the experienced crew, that size is doable, but the quality is just not there. It's more of a windy, lumpy mess than a surfer's paradise. Honestly, on a beach setup like this, it looks like it might be more interesting for the kite surfers than for us.
From Thursday the 6th right through to the middle of the second week, it's a painful run of flatness or tiny, weak swell. The wind shifts around, giving us a few moments of offshore flow on Monday the 10th and Tuesday the 11th, but the swell is virtually non-existent – we're talking 0.3ft to 0.7ft with next to no energy. It's clean, but you can't surf what isn't there.
Around the 15th of August, there's a flicker of life with a 2ft SSW swell, but it's onshore and messy again.
To be honest, looking at this entire 16-day run, there isn't a single standout day. There are no windows where decent swell, clean wind, and good conditions line up. It's one of those classic flat spells for the area. It tends not to stay poor for long, and forecasts can change, but right now, we're looking at a long, quiet period. Keep the board in the car just in case, but don't get your hopes up.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Mon night. Warm (max 22°C on Mon morning, min 13°C on Wed night). Winds increasing (calm on Mon morning, strong winds from the WSW by Wed morning). | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Fri morning, min 13°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||
Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | |||||||||||||||
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) | SE 4 | SW 8 | SW 8 | SSW 5 | SSW 5 | SW 6 | WSW 6 | WSW 6 | WNW 6 | SW 6 | SW 6 | SSW 6 | SW 5 | S 12 | SW 4 | SW 4 | SSW 5 | SW 5 | SW 8 | SW 7 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 11 | 10 | 57 | 80 | 135 | 209 | 179 | 246 | 23 | 9 | 6 | 6 | 3 | 17 | 12 | 77 | 48 | 12 | 13 | 6 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross-off | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | on | on | cross-on | cross-on | on | cross-on | on | cross-on | off |
High Tide | 12:54PM3.59m | 1:07AM3.94m | 1:32PM3.51m | 1:48AM3.77m | 2:18PM3.37m | 2:39AM3.55m | 3:15PM3.22m | 3:44AM3.33m | 4:28PM3.12m | 5:06AM3.20m | 5:53PM3.16m | 6:34AM3.25m | 7:10PM3.38m | ||||||||
Low Tide | 7:41PM0.62m | 8:12AM0.50m | 8:22PM0.79m | 8:55AM0.70m | 9:10PM0.99m | 9:47AM0.92m | 10:11PM1.16m | 10:55AM1.10m | 11:32PM1.22m | 12:19PM1.13m | 1:01AM1.07m | 1:38PM0.97m | 2:14AM0.73m | ||||||||
 |  |  |  |  |  | | |  | | |  | | | | | |  | | | | |
 | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — | 5:47 | — | — |
 | — | — | 9:09 | — | — | 9:07 | — | — | 9:06 | — | — | 9:04 | — | — | 9:01 | — | — | 9:00 | — | 8:58 | — |
mm | — | — | 2 | 2 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 21 | 17 | 19 | 18 | 17 | 15 | 17 | 15 | 14 | 15 | 15 | 17 | 17 | 16 | 16 | 17 | 16 | 19 | 20 | 18 |
Feels °C | 20 | 18 | 16 | 16 | 13 | 13 | 7 | 10 | 8 | 9 | 12 | 12 | 14 | 14 | 13 | 12 | 13 | 14 | 18 | 20 | 16 |
Swell 1 Height (m) Direction Period (s) | SSE 4 | SW 8 | SW 8 | SW 8 | — | SW 6 | — | S 13 | SW 6 | SW 6 | NNW 5 | N 4 | SW 5 | — | SW 12 | SW 11 | — | SW 5 | SW 4 | SW 7 | SW 6 |
| kJ | 2 | 11 | 10 | 9 | — | 135 | — | 3 | 45 | 23 | 19 | 1 | 6 | — | 5 | 5 | — | 48 | 3 | 13 | 6 |
Swell 2 Height (m) Direction Period (s) | NE 4 | S 4 | — | NE 4 | — | — | — | — | S 13 | S 13 | SW 6 | SSW 6 | NW 3 | S 12 | — | — | — | W 8 | SW 8 | — | — |
| kJ | 3 | 1 | — | 1 | — | — | — | — | 3 | 3 | 9 | 3 | 3 | 3 | — | — | — | 1 | 10 | — | — |
Swell 3 Height (m) Direction Period (s) | SW 9 | NE 4 | — | — | — | — | — | — | — | — | S 12 | SW 12 | — | — | — | — | — | S 11 | — | S 12 | — |
| kJ | 3 | 1 | — | — | — | — | — | — | — | — | 3 | 6 | — | — | — | — | — | 2 | — | 3 | — |
Wind waves Height (m) Direction Period (s) | SE 4 | — | — | SSW 5 | SSW 5 | — | WSW 6 | WSW 6 | WNW 6 | NW 5 | W 4 | SW 3 | — | SW 3 | SW 4 | SW 4 | SSW 5 | — | NW 4 | WNW 4 | NW 3 |
| kJ | 6 | — | — | 57 | 80 | — | 209 | 179 | 246 | 77 | 5 | 2 | — | 2 | 17 | 12 | 77 | — | 12 | 10 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 179 | 185 | 150 | 277 | 277 | 277 | 306 | 466 | 541 | 283 | 272 | 282 | 256 | 260 | 256 | 261 | 352 | 158 | 150 | 201 | 256 |
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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