Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 15 Sep 2026:
- Best quality surf: Sunday 20 Sep, 7AM (local time) - 2.5ft (0.7m), 6s period, SW swell with glassy winds.
- Most powerful swell: Friday 18 Sep, 10PM (local time) - 8ft (2.4m), 7s period, SW swell with 490 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 7AM (local time) - 2.5ft (0.7m), 6s period with SW 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 20) at 7AM. The primary swell is predicted to be 0.7m and 6s period with a secondary swell of 0.1m and 14s. Another secondary swell of 0.5m and 4s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 2.4m 7s and forecast to arrive on Friday (Sep 18) at 10PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Wednesday (Sep 16) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Sun 20th Sep) | 2.5ft (0.7m) 6s |
| Best Surf | 7AM (Sun 20th Sep) | 2.5ft (0.7m) 6s |
| Most Powerful | 10PM (Fri 18th Sep) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
G’day, I’m Rusty.
Alright, mate, let’s be straight with you. Looking over the next 16 days at Cable Bay (Porth Trecastell), I’m not gonna sugar-coat it – it’s a grim run. There’s no good surf to be had in this whole window. Every single session is flagged as poor surf conditions, and with scores that low, you’re better off leaving the board at home.
We’ve got a bit of swell pushing in from the 15th through the 19th of September, with heights reaching up to 5 to 6 feet on the Saturday morning and afternoon, coming from the SW with moderate energy (230 and 296). But the wind is the killer. Fresh cross-onshore breezes up to 19 mph are chopping everything to pieces, so it’s just messy, lumpy lines with no shape. The period is short too, only around 5 to 7 seconds, so it’s all wind-slop and no punch. For the 19th, the combined energy climbs a bit into the moderate range, but with the wind messing it up, it’s not worth paddling out. That combination of onshore wind and short-period chop honestly looks more interesting for a kite surfer than a paddle surfer.
After the 20th, the swell drops right off. You’ve got a good 7 days of tiny, weak waves (combined energy dropping to 21, 33, even just 42 for the morning of the 23rd), with a few glassy moments late in the run on the 27th and 29th of September. On the 27th afternoon, you’ll see glassy conditions with a tiny 1 foot wave, but it’s so small you’d be floating more than surfing. The 28th and 29th have glassy mornings and a little 2-foot pulse late on the 29th, but again, not enough to do anything with. The combined energy never cracks 15 on those days.
Water temp here is sitting about average for the time of year, so no worries on that front, but it won’t help with the lack of waves.
There’s no standout, no hidden gem. This is a proper blank run for the area – the kind of stretch where the forecast can only get better, but for now, it’s a hard pass all the way to the end of the month.
Stay dry,
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Mon night. Very mild (max 17°C on Mon night, min 13°C on Tue night). Mainly strong winds. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Fri night. Very mild (max 18°C on Sat morning, min 13°C on Thu night). Winds decreasing (strong winds from the SSW on Fri afternoon, calm by Sat night). | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
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) | WSW 5 | W 5 | SW 6 | NW 5 | W 4 | SW 5 | WSW 5 | W 5 | W 5 | W 5 | SW 5 | SW 7 | SW 7 | SW 7 | SW 6 | SSW 6 | SW 6 | SW 5 | SSW 5 | SSW 5 | SSW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 111 | 75 | 17 | 100 | 19 | 102 | 128 | 120 | 126 | 54 | 76 | 335 | 230 | 296 | 85 | 26 | 17 | 55 | 46 | 33 | 44 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross-on | on | cross-on | cross-on | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 12:24PM3.85m | 00:44AM3.84m | 1:00PM3.60m | 1:24AM3.48m | 1:40PM3.31m | 2:09AM3.11m | 2:30PM3.01m | 3:16AM2.79m | 3:54PM2.78m | 5:10AM2.63m | 5:52PM2.79m | 6:48AM2.73m | 7:09PM3.00m | ||||||||
Low Tide | 6:58AM0.30m | 7:12PM0.44m | 7:33AM0.66m | 7:49PM0.75m | 8:09AM1.03m | 8:30PM1.08m | 8:52AM1.36m | 9:24PM1.38m | 9:52AM1.62m | 10:46PM1.58m | 11:27AM1.71m | 00:33AM1.54m | 1:01PM1.56m | 1:44AM1.28m | |||||||
 |  |  | | | | | |  | |  | | | | | |  | | | | | |
 | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:58 | — | — | 7:01 | — | — |
 | — | 7:35 | — | — | 7:31 | — | — | 7:30 | — | — | 7:27 | — | — | 7:24 | — | — | 7:22 | — | — | 7:20 | — |
mm | — | 2 | 1 | — | — | 4 | — | — | — | — | 3 | 5 | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 15 | 14 | 15 | 15 | 14 | 15 | 14 | 14 | 14 | 16 | 18 | 17 | 17 | 14 | 16 | 17 | 17 | 17 | 17 |
Feels °C | 10 | 12 | 11 | 9 | 10 | 9 | 8 | 9 | 7 | 9 | 7 | 11 | 14 | 13 | 15 | 10 | 13 | 15 | 17 | 15 | 16 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 6 | SW 6 | N 5 | — | — | — | — | — | — | — | — | — | SW 6 | SSW 6 | SW 6 | — | S 13 | — | — |
| kJ | — | — | 17 | 5 | 19 | — | — | — | — | — | — | — | — | — | 85 | 26 | 17 | — | 3 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | SW 11 | SW 11 | W 11 | — | — | — | — | — | — | — | — | — | — | NW 4 | NNW 3 | — | — | — | — |
| kJ | — | — | 5 | 5 | 2 | — | — | — | — | — | — | — | — | — | — | 3 | 1 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 14 | S 14 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 4 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 5 | W 5 | NW 5 | NW 5 | W 4 | SW 5 | WSW 5 | W 5 | W 5 | W 5 | SW 5 | SW 7 | SW 7 | SW 7 | — | — | — | SW 5 | SSW 5 | SSW 5 | SSW 5 |
| kJ | 111 | 75 | 66 | 100 | 19 | 102 | 128 | 120 | 126 | 54 | 76 | 335 | 230 | 296 | — | — | — | 55 | 46 | 33 | 44 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 541 | 541 | 173 | 187 | 261 | 283 | 283 | 541 | 173 | 261 | 302 | 261 | 381 | 44 | 44 | 150 | 181 | 172 | 172 | 256 | 158 |
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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