Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 18 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 1PM (local time) - 1.5ft (0.5m), 4s period, WNW 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 0.5m 4s and forecast to arrive on Saturday (Jul 25) at 1PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Jul 22) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Sat 25th Jul) | 1.5ft (0.5m) 4s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, Rusty here, and I've gotta level with you straight up. It’s a tough watch for the next 16 days at Cable Bay. We’re looking at a long, dry spell with no real surf to speak of for the first week and a half.
We start off with a big nothing-burger. From Saturday the 18th right through to around the 25th of July, it’s flat. The water is a weirdly warm 63°F – that’s over 4°F warmer than usual for this time of year, which is proper odd, but it doesn’t help us one bit when there’s no swell. For about a week, the combined energy is hardly a whisper (0-3), so don't even bother with the wetsuit.
There’s a flicker of something on Friday the 24th, with a tiny 2ft swell from the WNW, but the cross-on wind and a period of only 4 seconds means it’s just messy and weak. Not worth the paddle.
The only real chance comes on Monday the 27th of July. We’ve got a 3ft swell from the WSW, pushing a combined energy of 29, which is still weak but at least it’s something. The wind is a gentle cross-shore, so it might be just about clean enough for a log. The period is a short 4 seconds though, so it won’t have any punch. This is the best we’ve got, and it’s only for the intermediate surfer out on a longboard. It’s the only spot in the whole window that even gets a look-in, and it’s a fairly consistent break, so it’s not a total write-off, but it’s slim pickings.
For the rest of the run into the 2nd of August, it’s back to dead flat. The wind does go offshore and even glassy on the 31st, but with zero swell, that’s just a day for a flat-water paddle, not a surf.
Honestly, this is a quiet patch. It’s a common thing for the area, so don’t stress. Forecasts can change.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Sun afternoon, min 13°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 18°C on Tue afternoon, min 11°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | ||||||||||||||
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) | S 11 | S 11 | S 11 | S 10 | N 4 | N 5 | N 5 | N 6 | NNW 5 | N 4 | N 6 | NNW 6 | NNW 6 | N 6 | NNW 5 | W 3 | NNW 5 | S 13 | S 13 | WSW 3 |
Wave Graph  | ||||||||||||||||||||
 kJ | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 3 | 2 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | on | cross-on | on | cross-on |
High Tide | 1:12AM4.25m | 1:45PM3.57m | 2:00AM3.97m | 2:34PM3.37m | 2:51AM3.65m | 3:28PM3.18m | 3:49AM3.33m | 4:30PM3.04m | 4:56AM3.09m | 5:37PM2.97m | 6:08AM2.98m | 6:44PM3.01m | ||||||||
Low Tide | 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 | 11:45AM1.31m | 00:23AM1.40m | 1:01PM1.37m | 1:39AM1.32m | |||||||
 |  |  | |  | | | | | | | | | | | | | | |  | |
 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — |
 | — | 9:34 | — | — | 9:32 | — | — | 9:31 | — | — | 9:30 | — | — | 9:29 | — | — | 9:28 | — | — | 9:25 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 16 | 16 | 16 | 18 | 16 | 14 | 16 | 15 | 18 | 18 | 14 | 15 | 16 | 15 | 13 | 17 | 17 | 14 | 16 | 16 |
Feels °C | 12 | 15 | 13 | 16 | 14 | 11 | 13 | 13 | 15 | 15 | 12 | 11 | 12 | 13 | 11 | 16 | 16 | 12 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 6 | S 11 | S 11 | S 10 | — | — | — | — | — | — | — | — | — | — | — | N 5 | NNW 5 | N 4 | N 4 | WSW 3 |
| kJ | 1 | 2 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | 18 | 8 | 4 | 1 | 2 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | S 13 | — |
| kJ | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — |
Wind waves Height (m) Direction Period (s) | N 5 | N 5 | N 4 | NNW 4 | N 4 | N 5 | N 5 | N 6 | NNW 5 | N 4 | N 6 | NNW 6 | NNW 6 | N 6 | NNW 5 | W 3 | — | — | W 3 | — |
| kJ | 57 | 33 | 10 | 9 | 7 | 25 | 18 | 77 | 25 | 15 | 106 | 160 | 108 | 62 | 36 | 1 | — | — | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 284 | 233 | 284 | 284 | 272 | 284 | 1003 | 272 | 317 | 301 | 53 | 290 | 582 | 53 | 260 | 277 | 282 | 290 | 1098 | 261 |
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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