Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 12 Sep 2026:
- Best quality surf: Sunday 13 Sep, 1AM (local time) - 3ft (0.9m), 7s period, SSW swell with glassy winds.
- Most powerful swell: Friday 18 Sep, 10PM (local time) - 8ft (2.5m), 7s period, SW swell with 640 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 1AM (local time) - 3ft (0.9m), 7s 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 7s period with a secondary swell of 0.3m and 4s. 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 2.5m 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 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sun 13th Sep) | 3ft (0.9m) 7s |
| Best Surf | 1AM (Sun 13th Sep) | 3ft (0.9m) 7s |
| Most Powerful | 10PM (Fri 18th Sep) | 8ft (2.5m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Right, let’s have a proper look at what’s coming up for Cable Bay (Porth Trecastell). I’ll be straight with you – it’s a grim run for the next 16 days. There’s not a single session in that whole window that I’d get excited about, so I’ll talk you through what’s actually happening.
The forecast opens on Saturday the 12th with a bit of a tease – a 6ft swell rolling in from the SW, but it’s blowing a solid 22 mph onshore, straight into your face. That’s 314 of combined swell energy (moderate), but with that wind it’s just messy. No good. Then we drop off hard. Sunday the 13th sees tiny 2ft leftovers with a cross-onshore wind and a period of only 6 seconds – weak energy around 25. It stays poxy through Monday and Tuesday, with heights barely cracking 4ft and wind always on the wrong side. The water temperature is about 63°, which feels a touch warmer than normal for this time of year – not that it helps.
Midweek, Wednesday the 16th morning has a slightly better push: 5ft from the NW, period of 5 seconds, cross-shore wind at 19 mph. Combined energy hits 124 (moderate), but it’s lumpy and cross-chop. Still not rideable with any joy. Thursday and Friday are more of the same – onshore winds, short-period slop. Friday afternoon the 18th sees 6ft from the SW and 176 energy, but it’s blowing 22 mph onshore again. Too rough.
Into the second week, Saturday the 19th still has 5ft from the WSW with 149 energy, but wind is a strong 25 mph cross-onshore. That’s kite-surf territory, not paddle. Sunday the 20th drops back to 2ft, and from Monday the 21st onward it’s all under 2ft, often with onshore winds, rain, and combined energy in the single digits. Wednesday the 23rd afternoon goes glassy with a 2ft swell from the SW, period of 4 seconds – but it’s just not enough to push through. The very tail end of the run, Sunday the 27th, shows a 0.3ft swell with a period of 14 seconds, combined energy of just 5 – that’s a long-period ghost, not a wave you can surf.
There are no standouts. No hidden gems. This is one of those blank runs where the area just isn’t delivering. It tends not to stay this poor forever, but for now, leave the board in the van.
Rusty.
Short Range ForecastModerate rain (total 19mm), heaviest on Mon night. Very mild (max 18°C on Sat afternoon, min 14°C on Mon night). Winds increasing (calm on Sat night, fresh winds from the SSW by Mon afternoon). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Tue afternoon. Very mild (max 16°C on Tue afternoon, min 13°C on Tue night). Mainly fresh winds. | |||||||||||||||||||
Sat 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||
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 7 | SSW 7 | SSW 6 | SW 6 | SSW 6 | SSW 4 | SSW 5 | SSW 6 | WSW 6 | WNW 5 | SW 6 | NW 5 | W 4 | WSW 4 | WNW 5 | W 5 | W 4 | SW 5 | SW 6 | SW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 314 | 76 | 25 | 17 | 18 | 30 | 86 | 309 | 90 | 37 | 9 | 114 | 18 | 21 | 48 | 46 | 38 | 28 | 176 | 503 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross | cross | cross-on | on | cross | cross-on | cross-on | on | on | on |
High Tide | 10:54PM4.52m | 11:16AM4.11m | 11:30PM4.39m | 11:50AM4.02m | 00:07AM4.16m | 12:24PM3.85m | 00:44AM3.84m | 1:00PM3.60m | 1:24AM3.48m | 1:40PM3.31m | 2:09AM3.11m | 2:30PM3.01m | 3:16AM2.79m | |||||||
Low Tide | 5:22PM-0.06m | 5:48AM-0.24m | 5:59PM0.01m | 6:23AM-0.01m | 6:35PM0.19m | 6:58AM0.30m | 7:12PM0.44m | 7:33AM0.66m | 7:49PM0.75m | 8:09AM1.03m | 8:30PM1.08m | 8:52AM1.36m | 9:24PM1.38m | |||||||
 |  | | | | |  |  | |  | | | | | | | | | |  | |
 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — |
 | 7:42 | — | — | 7:38 | — | — | 7:37 | — | — | 7:35 | — | — | 7:31 | — | — | 7:30 | — | — | 7:27 | — |
mm | — | — | — | — | — | — | — | 19 | — | 1 | — | — | — | 2 | — | — | — | — | — | 6 |
Temp °C | 18 | 18 | 17 | 17 | 17 | 16 | 17 | 17 | 15 | 16 | 14 | 13 | 15 | 15 | 14 | 15 | 14 | 15 | 15 | 16 |
Feels °C | 14 | 18 | 17 | 17 | 16 | 13 | 13 | 12 | 12 | 12 | 8 | 8 | 11 | 11 | 8 | 11 | 9 | 9 | 9 | 10 |
Swell 1 Height (m) Direction Period (s) | — | SSW 7 | SSW 6 | SW 6 | — | — | — | — | — | SW 6 | SW 6 | SW 6 | N 5 | NNW 5 | SW 6 | — | — | NW 4 | — | — |
| kJ | — | 76 | 25 | 17 | — | — | — | — | — | 24 | 9 | 5 | 19 | 4 | 38 | — | — | 9 | — | — |
Swell 2 Height (m) Direction Period (s) | — | NW 4 | — | — | — | — | — | — | — | — | S 11 | SW 11 | SW 5 | — | — | — | — | — | — | — |
| kJ | — | 2 | — | — | — | — | — | — | — | — | 2 | 5 | 1 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SW 11 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 5 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 7 | — | — | — | SSW 6 | SSW 4 | SSW 5 | SSW 6 | WSW 6 | WNW 5 | NW 5 | NW 5 | W 4 | WSW 4 | WNW 5 | W 5 | W 4 | SW 5 | SW 6 | SW 7 |
| kJ | 314 | — | — | — | 18 | 30 | 86 | 309 | 90 | 37 | 63 | 114 | 18 | 21 | 48 | 46 | 38 | 28 | 176 | 503 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 333 | 0 | 44 | 173 | 256 | 256 | 256 | 294 | 44 | 541 | 187 | 173 | 181 | 256 | 282 | 284 | 592 | 381 | 495 | 783 |
Best forecast wave conditions in Anglesy | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
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‘Porth Neigwl: Choppy waves hadn't tidied much (from what I could see in the dark.’
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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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