Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 7 Sep 2026:
- Best quality surf: Saturday 12 Sep, 10PM (local time) - 3ft (0.9m), 6s period, SW swell with offshore winds.
- Most powerful swell: Monday 7 Sep, 10PM (local time) - 8ft (2.4m), 7s period, SW swell with 511 kJ wave energy.
- Next surfable swell (1★+): Saturday 12 Sep, 10PM (local time) - 3ft (0.9m), 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 Saturday (Sep 12) at 10PM. The primary swell is predicted to be 0.9m and 6s period. The wind is predicted to be offshore 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 Monday (Sep 07) 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 1.8m 6s period and expected on Wednesday (Sep 09) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sat 12th Sep) | 3ft (0.9m) 6s |
| Best Surf | 10PM (Sat 12th Sep) | 3ft (0.9m) 6s |
| Most Powerful | 10PM (Mon 7th Sep) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, folks, Rusty here, and I’ve gotta be straight with you – the next couple of weeks ain’t looking like a party for the paddle crew. Let’s break it down for Cable Bay (Porth Trecastell).
The start of this period is a write-off. We’re looking at a solid run of poor surf conditions right through the first week, with not a single standout session. The swell is mostly short-period, wind-affected junk, and the winds are cross-on or onshore from every angle. The first real glimmer of hope doesn’t even show up until the morning of Wednesday, September 16th, but even then it’s marginal.
That morning, the swell bumps up to 8 ft from the SW with a period of 7 seconds, and the combined energy is a solid 508 (moderate-strong), but it’s a cross-shore wind from the WNW and the forecast says “marginal surf conditions or questionable tide.” That’s a big caveat – the short period (7 seconds) and lumpy cross-shore mean it’s unlikely to be clean. The wind is moderate, so it’s not a total blowout, but it’s far from the glassy perfection we dream of. Afternoon holds 7 ft from the SW, period still 7 seconds, energy at 403, with an onshore wind from the SW. Still messy.
The following morning, Thursday, September 17th, sees a 6 ft from the WNW, period 6 seconds, and a stiff cross-onshore from the SSW. Energy is 349, but it’s lumpy and fresh. Not a day to get excited about.
Honestly, if you’re a kite surfer, the setup on the 16th with that 8 ft+ swell and strong cross-shore winds might look interesting, but for a paddle surfer, there’s just nothing to recommend. The rest of the window into the second week is more of the same: small, short-period, wind-battered slop or strong onshores. The water is a touch warmer than normal for this time of year at 63°, but that’s small comfort when the waves are a mess.
So the outlook is grim. No standout breaks, no clean windows. The best you can say is that the 16th and 17th have some size, but the quality just isn’t there. A blank run like this is more normal for the area when the wind sets in from the wrong angles. Forecasts change, but right now, there’s nowhere to go.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Mon night. Very mild (max 19°C on Sun afternoon, min 12°C on Mon night). Winds decreasing (strong winds from the SW on Mon night, light winds from the NW by Wed morning). | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Wed night. Very mild (max 18°C on Thu night, min 13°C on Wed night). Winds increasing (light winds from the SW on Fri afternoon, strong winds from the SSW by Sat morning). | |||||||||||||||||||
Sun 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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) | SSW 6 | SSW 6 | SW 14 | SSW 5 | SW 7 | WSW 6 | W 6 | NW 7 | SW 6 | SW 8 | SW 4 | SW 6 | SSW 6 | SW 6 | NW 5 | SW 6 | SSW 4 | SSW 5 | SW 6 | SW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 181 | 159 | 33 | 59 | 428 | 181 | 239 | 411 | 10 | 9 | 32 | 237 | 176 | 106 | 43 | 19 | 13 | 109 | 77 | 42 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | on | cross-on | on | cross-on | cross | cross-on | cross-on | cross-on | on | cross-off |
High Tide | 5:48PM3.13m | 6:46AM3.12m | 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 | |||||||
Low Tide | 00:57AM0.99m | 1:29PM1.03m | 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 | ||||||||
 |  |  | | | |  |  | |  |  | | | | | | |  | | | |
 | — | — | 6:35 | — | — | 6:37 | — | — | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — |
 | 7:55 | — | — | 7:53 | — | — | 7:52 | — | — | 7:49 | — | — | 7:46 | — | — | 7:44 | — | — | 7:42 | — |
mm | — | 1 | — | — | 4 | — | 2 | — | — | — | 1 | 2 | — | 1 | — | — | — | 2 | 1 | — |
Temp °C | 19 | 17 | 15 | 16 | 15 | 14 | 15 | 14 | 14 | 14 | 15 | 15 | 17 | 18 | 14 | 15 | 15 | 16 | 17 | 14 |
Feels °C | 13 | 14 | 11 | 11 | 7 | 6 | 8 | 6 | 9 | 10 | 10 | 10 | 13 | 15 | 11 | 13 | 8 | 8 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 13 | — | SW 14 | WNW 4 | SW 12 | — | — | SW 6 | SW 6 | N 5 | N 4 | — | — | — | SW 6 | SW 6 | NNW 4 | — | SW 6 | SW 6 |
| kJ | 6 | — | 33 | 1 | 6 | — | — | 27 | 10 | 28 | 2 | — | — | — | 39 | 19 | 1 | — | 77 | 42 |
Swell 2 Height (m) Direction Period (s) | — | SW 17 | — | — | — | — | — | — | WSW 8 | SW 8 | — | — | — | — | — | NNW 4 | SW 8 | — | — | — |
| kJ | — | 11 | — | — | — | — | — | — | 6 | 9 | — | — | — | — | — | 12 | 2 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NW 4 | — | — | — | — | — | — | NW 4 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | 1 | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 6 | SSW 6 | WSW 4 | SSW 5 | SW 7 | WSW 6 | W 6 | NW 7 | NW 6 | W 4 | SW 4 | SW 6 | SSW 6 | SW 6 | NW 5 | WNW 4 | SSW 4 | SSW 5 | — | NW 3 |
| kJ | 181 | 159 | 20 | 59 | 428 | 181 | 239 | 411 | 152 | 8 | 32 | 237 | 176 | 106 | 43 | 3 | 13 | 109 | — | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 341 | 283 | 44 | 319 | 283 | 283 | 604 | 541 | 173 | 44 | 256 | 285 | 495 | 168 | 172 | 44 | 172 | 256 | 356 | 47 |
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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