Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 8 Sep 2026:
- Most powerful swell: Saturday 12 Sep, 7PM (local time) - 6ft (1.9m), 6s period, SSW swell with 279 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 Saturday (Sep 12) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 09) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Sat 12th Sep) | 6ft (1.9m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’ve got the outlook for Cable Bay (Porth Trecastell). Let’s be straight with you, mate—this stretch of coast is lookin’ pretty grim for the next couple of weeks. We’ve got a big gap of poor conditions ahead, so don’t get your hopes up.
The water temperature is sitting around 63°, which is a touch warmer than normal for this time of year, so at least you won’t be freezing if you do paddle out.
The first recommendation doesn’t even appear—we’re starting on Monday the 7th of September with a 5 ft SW swell, but it’s blown out by a strong 25 mph SSW wind. That’s messy, onshore junk. The combined energy is weak at 133, and it’s just not worth it. This sets the tone for the whole period.
Tuesday the 8th is more of the same: 5 ft to 5 ft of short-period windswell, but with cross-onshore winds in the 19-22 mph range. Lumpy, choppy, and no fun. Wednesday the 9th drops right off to 1 ft, tiny and weak. Thursday the 10th kicks back up to 5 ft with a 160 combined energy, but again, cross-onshore and lumpy. Friday the 11th is small and weak again.
Saturday the 12th sees the biggest push of the whole outlook—6 ft from the SSW with a combined energy of 211, which is moderate. But with 25 mph cross-onshore wind and rain, it’s a total write-off for surfing. That kind of energy and wind setup looks way more interesting for kite surfing than paddle surfing.
Sunday the 13th to Tuesday the 15th is all small, weak, and choppy. Nothing above 3 ft. Wednesday the 16th and Thursday the 17th have some clean moments with light winds and tiny 0.3 ft to 1 ft waves—glass-like conditions but flat as a pancake.
From there, it’s a long gap of poor, onshore, and small conditions right through to the end of the outlook on Tuesday the 22nd of September. The last few days have a little pulse: 4 ft on the 22nd with a combined energy of 105, but it’s hammered by 25 mph winds again.
So honestly, there are no standout days here. If you’re desperate, the cleanest water will be on the 16th and 17th, but you’ll be lucky to catch a ripple. This is one of those stretches where the ocean just isn’t cooperating. Forecasts can change, but right now, it’s a blank run.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Mon night. Very mild (max 16°C on Mon afternoon, min 12°C on Tue night). Winds decreasing (fresh winds from the SSW on Mon afternoon, light winds from the WSW by Wed afternoon). | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Sat afternoon. Very mild (max 17°C on Thu night, min 13°C on Fri night). Winds increasing (calm on Fri afternoon, strong winds from the S by Sat morning). | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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) | SW 5 | SW 7 | W 5 | WNW 5 | SW 6 | SW 8 | SW 7 | SSW 4 | SW 5 | SSW 6 | SW 6 | SSW 6 | SW 6 | SW 6 | SSW 4 | SSW 6 | SW 6 | SW 6 | SW 6 | SW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 133 | 292 | 120 | 138 | 9 | 15 | 14 | 18 | 51 | 160 | 139 | 28 | 20 | 9 | 38 | 211 | 156 | 45 | 18 | 8 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross | cross | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on |
High Tide | 7:12PM3.41m | 7:58AM3.37m | 8:11PM3.77m | 8:48AM3.63m | 8:58PM4.11m | 9:29AM3.86m | 9:39PM4.37m | 10:06AM4.03m | 10:17PM4.51m | 10:42AM4.11m | 10:54PM4.52m | 11:16AM4.11m | 11:30PM4.39m | |||||||
Low Tide | 2:07AM0.62m | 2:30PM0.70m | 3:02AM0.22m | 3:19PM0.38m | 3:49AM-0.10m | 4:02PM0.12m | 4:31AM-0.30m | 4:43PM-0.03m | 5:10AM-0.34m | 5:22PM-0.06m | 5:48AM-0.24m | 5:59PM0.01m | ||||||||
 |  |  | |  | | |  | |  | |  | | |  | | | | | | |
 | — | — | 6:37 | — | — | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — |
 | 7:53 | — | — | 7:52 | — | — | 7:49 | — | — | 7:46 | — | — | 7:44 | — | — | 7:42 | — | — | 7:38 | — |
mm | 2 | 5 | — | 1 | — | — | — | — | — | 1 | 1 | — | — | — | — | 4 | 1 | — | — | — |
Temp °C | 16 | 15 | 14 | 16 | 14 | 13 | 14 | 15 | 16 | 16 | 17 | 14 | 15 | 14 | 15 | 16 | 17 | 14 | 15 | 16 |
Feels °C | 10 | 11 | 7 | 9 | 7 | 9 | 11 | 11 | 10 | 10 | 15 | 10 | 12 | 12 | 8 | 11 | 13 | 9 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | — | SW 12 | SW 12 | SW 11 | SW 6 | SW 8 | N 5 | N 4 | — | — | SW 6 | SSW 6 | SW 6 | SW 6 | — | — | — | SW 6 | SW 6 | SW 6 |
| kJ | — | 6 | 5 | 5 | 9 | 15 | 19 | 1 | — | — | 139 | 28 | 20 | 9 | — | — | — | 45 | 18 | 8 |
Swell 2 Height (m) Direction Period (s) | — | — | SW 11 | SW 10 | SW 11 | NW 5 | SW 7 | — | — | — | — | — | — | N 4 | — | — | — | SW 7 | — | NNW 5 |
| kJ | — | — | 5 | 4 | 4 | 4 | 14 | — | — | — | — | — | — | 1 | — | — | — | 12 | — | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | WNW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 7 | W 5 | WNW 5 | NNW 6 | NNW 6 | W 3 | SSW 4 | SW 5 | SSW 6 | — | NW 4 | NNW 4 | — | SSW 4 | SSW 6 | SW 6 | NW 5 | NNW 4 | — |
| kJ | 133 | 292 | 120 | 138 | 189 | 74 | 1 | 18 | 51 | 160 | — | 21 | 11 | — | 38 | 211 | 156 | 32 | 11 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 319 | 283 | 173 | 541 | 173 | 181 | 44 | 231 | 279 | 260 | 44 | 172 | 185 | 158 | 293 | 262 | 283 | 317 | 173 | 256 |
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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