Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 9 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 4PM (local time) - 6.5ft (2.0m), 6s period, WNW swell with offshore winds.
- Most powerful swell: Thursday 10 Sep, 4PM (local time) - 7ft (2.2m), 7s period, SSW swell with 424 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 1AM (local time) - 3ft (0.9m), 6s period with SSW swell.
Best Forecast Surf Conditions for Cable Bay (Porth Trecastell) this week:
The surf forecast for Cable Bay (Porth Trecastell) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 13) at 1AM. The primary swell is predicted to be 0.9m and 6s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 2.2m 7s and forecast to arrive on Thursday (Sep 10) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Sunday (Sep 13) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sun 13th Sep) | 3ft (0.9m) 6s |
| Best Surf | 4PM (Wed 16th Sep) | 6.5ft (2.0m) 6s |
| Most Powerful | 4PM (Thu 10th Sep) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, let’s get down to it. If you’re checking Cable Bay over the next couple of weeks, you’re going to want to temper those expectations. It’s looking bleak, real bleak. The swell window is there, but the wind is just going to screw it up time and time again. We’re in for a long, quiet patch.
Water’s running at about 63° right now, which is a touch above the norm for this part of the year. Makes a difference when you’re sitting out there waiting for a set that never comes.
Through Thursday the 10th, we’ve got some size coming in, 6ft to 7ft, but it’s messy. That cross-onshore wind is going to have it all chopped up. It’s the kind of day you watch from the car, not paddle out into. The energy is there (424), but it’s all over the place. Not worth it.
Friday the 11th afternoon looks like the pick of a bad bunch early on. The wind dies right off, going light offshore, and there’s a small 2ft wave. It’s tiny, but if you’re desperate, it will be clean. You might get a few knee-high rollers on a longboard. That’s about the size of it.
The next real chance is Wednesday the 16th. The morning is clean with a cross-offshore breeze, but it’s small. The afternoon is the main event though: proper offshore wind at 25 km/h and the swell pushes up to 7ft from the WNW, with energy building nicely (319). That’s a proper wave, and that offshore wind is going to hold it up. This is the standout of the entire stretch. Still, at that size, it’s for the experienced crew only. Don’t be taking the soft-top out in that.
After that, it just drops away. A few tiny pulses here and there, but nothing that’s going to get you out of bed. There’s a long-period groundswell showing early on Monday the 21st, but it’s knee-high – all that period and no size. Then on Wednesday the 23rd, there’s a 5ft wave with light east winds and a clean face, but the energy is still only moderate (106) and the period is short. It’ll be there, but it won’t have any punch.
So, bottom line: if you can make Wednesday the 16th afternoon, that’s your session. It’s the only time the planets align for some proper, wind-blown offshore surf. The rest of the time, it’s a waiting game. And for the bigger, wind-affected days, this beach setup is going to be more fun for the kite crew than us paddle guys.
Stay patient, check the charts, and don’t force it. This could be one of those flat spells that hangs around. I’m off.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Thu afternoon. Very mild (max 17°C on Thu night, min 13°C on Fri morning). Winds decreasing (strong winds from the S on Thu morning, light winds from the WSW by Fri afternoon). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Sat morning. Very mild (max 19°C on Sat afternoon, min 13°C on Sat night). Winds decreasing (fresh winds from the SW on Sat morning, light winds from the N by Sat night). | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
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) | SW 8 | SW 8 | SW 4 | SSW 6 | SSW 7 | SW 7 | SW 7 | SW 6 | SSW 5 | SW 6 | SSW 6 | SSW 6 | SSW 6 | SW 6 | SSW 6 | SSW 5 | SSW 5 | SW 6 | SSW 5 | SSW 5 | SSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 15 | 14 | 26 | 163 | 424 | 103 | 35 | 20 | 80 | 269 | 216 | 71 | 26 | 9 | 12 | 56 | 64 | 123 | 64 | 41 | 91 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | on | cross-on | on | on | cross-off | cross | on | cross-on | cross-on | on | cross-on | cross-on | on | cross-off |
High Tide | 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 | 11:50AM4.02m | 00:07AM4.16m | 12:24PM3.85m | 00:44AM3.84m | ||||||||
Low Tide | 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 | 6:23AM-0.01m | 6:35PM0.19m | 6:58AM0.30m | 7:12PM0.44m | ||||||||
 |  |  |  | |  | | | | |  | | | |  | | | | |  |  | |
 | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — |
 | — | 7:49 | — | — | 7:46 | — | — | 7:44 | — | — | 7:42 | — | — | 7:38 | — | — | 7:37 | — | — | 7:35 | — |
mm | — | — | — | 1 | 3 | 1 | — | — | 1 | 6 | — | — | — | — | — | 2 | — | — | — | 2 | 12 |
Temp °C | 14 | 14 | 15 | 16 | 16 | 17 | 13 | 14 | 16 | 16 | 19 | 17 | 14 | 14 | 17 | 17 | 17 | 17 | 18 | 19 | 15 |
Feels °C | 10 | 11 | 10 | 10 | 12 | 14 | 10 | 13 | 10 | 11 | 17 | 16 | 13 | 13 | 15 | 14 | 13 | 13 | 17 | 19 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 8 | N 5 | N 4 | — | — | SW 7 | SW 7 | SW 6 | — | — | — | SSW 6 | SSW 6 | SW 6 | N 4 | — | — | SW 12 | — | — | SSW 6 |
| kJ | 15 | 19 | 1 | — | — | 103 | 35 | 20 | — | — | — | 71 | 26 | 9 | 1 | — | — | 6 | — | — | 91 |
Swell 2 Height (m) Direction Period (s) | SW 6 | SW 8 | — | — | — | — | — | NNW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 5 | 14 | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | NW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 6 | W 4 | SW 4 | SSW 6 | SSW 7 | WNW 4 | NW 4 | WNW 3 | SSW 5 | SW 6 | SSW 6 | NNW 3 | N 5 | N 4 | SSW 6 | SSW 5 | SSW 5 | SW 6 | SSW 5 | SSW 5 | — |
| kJ | 111 | 4 | 26 | 163 | 424 | 7 | 18 | 2 | 80 | 269 | 216 | 4 | 32 | 10 | 12 | 56 | 64 | 123 | 64 | 41 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 173 | 44 | 172 | 307 | 471 | 44 | 173 | 181 | 276 | 261 | 244 | 0 | 157 | 150 | 179 | 256 | 287 | 231 | 179 | 45 | 49 |
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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