Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 22 Jul 2026:
- Most powerful swell: Monday 27 Jul, 10PM (local time) - 4.5ft (1.3m), 6s period, SSW swell with 108 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 1.3m 6s and forecast to arrive on Monday (Jul 27) 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 1.3m 6s period and expected on Wednesday (Jul 22) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Mon 27th Jul) | 4.5ft (1.3m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Right, grab a coffee, let’s have a look at the next 16 days for Cable Bay. I’ll be straight with you—this is a tough stretch. The forecast shows a whole lot of nothing for the first week, and even when some swell tries to show up, the wind is going to mess it up.
Right off the bat, there’s a big gap. From Wednesday the 22nd right through to the end of the month, it’s a write-off. We’ve got a few days of clean, glassy looking water, but with zero swell energy, it’s just a flat lake. The combined energy is sitting at 0, so don’t even bother bringing the board. The first hint of anything comes on Friday the 24th, but it’s a pathetic 0.3ft from the south with a 13-second period—that’s a long period for such a tiny wave, and it’s not going to break properly. Wind is onshore or cross-onshore most of the time, so it’s choppy and messy.
The situation doesn’t improve until we get into the second week. On Friday the 31st of July, we finally see some real size. The swell height jumps to 6ft in the morning and 6ft in the afternoon, coming from the south-southwest with a period of 6 seconds—that’s short period, windswell, so it’ll be a bit dumpy. The wind is a cross-onshore at 16 mph, so it’s going to be choppy and lumpy. The wave energy is moderate to strong, at 184 and 270, but with that wind, it’s not going to be clean. At 6ft, this is getting big for beginners, but it’s not a quality wave.
The only real standout, if you can call it that, is Saturday the 1st of August. The swell holds at 5ft from the southwest, but the wind swings onshore from the southwest in the afternoon at 9 mph. The combined energy is still moderate at 124. It’s still not great, but it’s the best of a bad lot.
Honestly, for Cable Bay, this is a blank run. The consistency is just not there. The swell direction is from the south and southwest, but the optimum swell is from the southwest, so that’s a match. The wind is just never in the right place to make it good. If you’re desperate, the 31st of July and the 1st of August offer the biggest waves, but the quality is poor. It’s more of a windsurfing or kiting day than a paddling day.
Keep an eye on the forecast, but I wouldn’t be making any plans.
Rusty
Short Range ForecastMostly dry. Very mild (max 18°C on Wed afternoon, min 11°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Mon afternoon, min 14°C on Sat night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | |||||||||||||||
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) | NNW 6 | NNW 5 | N 6 | N 6 | N 5 | N 4 | S 13 | S 13 | WSW 3 | S 12 | SW 4 | NW 4 | NW 4 | NW 4 | SW 3 | SW 4 | SSW 5 | SW 6 | SSW 5 | SSW 4 | SW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3 | 1 | 3 | 16 | 7 | 15 | 9 | 4 | 23 | 64 | 72 | 18 | 11 | 27 |
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-on | on | on | on | on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | on |
High Tide | 4:30PM3.04m | 4:56AM3.09m | 5:37PM2.97m | 6:08AM2.98m | 6:44PM3.01m | 7:16AM2.99m | 7:44PM3.13m | 8:13AM3.09m | 8:35PM3.31m | 9:01AM3.24m | 9:19PM3.52m | 9:41AM3.38m | 9:56PM3.72m | ||||||||
Low Tide | 10:38AM1.10m | 11:03PM1.32m | 11:45AM1.31m | 00:23AM1.40m | 1:01PM1.37m | 1:39AM1.32m | 2:06PM1.28m | 2:38AM1.14m | 2:56PM1.10m | 3:23AM0.93m | 3:37PM0.90m | 4:03AM0.71m | 4:13PM0.71m | ||||||||
 |  |  | | |  | | | |  | | | | | | | | | | | | |
 | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — |
 | — | — | 9:29 | — | — | 9:28 | — | — | 9:25 | — | — | 9:24 | — | — | 9:22 | — | — | 9:22 | — | — | 9:20 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 18 | 15 | 17 | 18 | 17 | 15 | 18 | 17 | 16 | 17 | 17 | 16 | 17 | 17 | 17 | 18 | 17 | 18 | 19 | 18 |
Feels °C | 13 | 14 | 13 | 14 | 14 | 16 | 14 | 16 | 16 | 12 | 15 | 17 | 11 | 14 | 14 | 12 | 13 | 13 | 15 | 16 | 16 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | N 5 | — | N 4 | NNW 4 | — | S 12 | S 12 | SW 4 | SW 6 | SW 4 | NNW 5 | NW 4 | — | — | SSW 5 | NW 4 | SW 5 |
| kJ | — | — | — | — | 25 | — | 3 | 1 | — | 3 | 3 | 4 | 5 | 3 | 4 | 1 | — | — | 18 | 1 | 27 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | S 13 | S 13 | — | — | — | S 11 | — | SW 6 | — | — | — | — | NW 4 | — | — |
| kJ | — | — | — | — | — | — | 3 | 3 | — | — | — | 2 | — | 1 | — | — | — | — | 4 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 6 | NNW 5 | N 6 | N 6 | — | N 4 | — | — | WSW 3 | W 3 | SW 4 | NW 4 | NW 4 | NW 4 | SW 3 | SW 4 | SSW 5 | SW 6 | — | SSW 4 | — |
| kJ | 86 | 62 | 82 | 62 | — | 6 | — | — | 1 | 3 | 16 | 7 | 15 | 9 | 4 | 23 | 64 | 72 | — | 11 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 272 | 881 | 277 | 277 | 294 | 260 | 420 | 1078 | 258 | 393 | 381 | 521 | 541 | 541 | 294 | 256 | 261 | 118 | 261 | 244 | 44 |
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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