Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 2 Sep 2026:
- Most powerful swell: Wednesday 9 Sep, 4AM (local time) - 8ft (2.5m), 6s period, W swell with 567 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 2.5m 6s and forecast to arrive on Wednesday (Sep 09) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Wednesday (Sep 09) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Wed 9th Sep) | 8ft (2.5m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what the next couple of weeks are serving up for us.
Straight up, I gotta be honest with you – this is a tough stretch. We're looking at a long, dry spell with barely a ripple to get excited about for most of the 16-day window. From now right through to the middle of the month, it's pretty grim. There's a solid gap of nearly two weeks where the surf is just not happening. The consistent onshore winds and short-period, weak energy swells are making a mess of things at Cable Bay (Porth Trecastell). The water temp is sitting at 63°, which is a touch warmer than normal for this time of year, but that's about the only positive spin I can put on it.
The first sniff of something remotely surfable doesn't show up until Tuesday the 15th of September. Morning at Cable Bay is looking at a tiny 4ft swell coming from the SSW, but with a short period of 5 seconds, so the energy is weak (69). The wind is a light cross-onshore from the south at only 6 mph, and while the forecast calls it "marginal," it might just be rideable for someone desperate. It's a very small window, and it's not going to be pretty.
After that, the doldrums return and we're back to practically flat conditions through the 16th and 17th, with glassy or near-calm winds but absolutely no swell to push around. It’s a blank run, plain and simple. For this area, a stretch like this isn't unheard of, so don't lose faith – forecasts can change, but for now, it's looking like a time to sort your gear or go for a paddleboard.
Stay patient.
Rusty.
Short Range ForecastHeavy rain (total 20mm), heaviest during Thu night. Very mild (max 18°C on Wed night, min 13°C on Fri night). Winds decreasing (fresh winds from the SW on Thu afternoon, light winds from the WNW by Fri night). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Mon afternoon. Warm (max 21°C on Sun afternoon, min 12°C on Mon afternoon). Winds increasing (light winds from the W on Sat morning, strong winds from the WSW by Mon night). | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
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) | SSW 5 | SSW 6 | SW 7 | SW 7 | SW 6 | SW 6 | WSW 5 | SW 5 | WNW 5 | SW 6 | SSW 3 | SSW 4 | S 4 | SSW 6 | SW 6 | SW 5 | SW 6 | WSW 6 | WSW 6 | WSW 6 | W 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 91 | 154 | 268 | 164 | 165 | 120 | 155 | 98 | 39 | 18 | 7 | 16 | 19 | 81 | 138 | 94 | 258 | 215 | 333 | 272 | 411 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 1:01PM3.73m | 1:22AM3.82m | 1:47PM3.51m | 2:14AM3.50m | 2:44PM3.26m | 3:24AM3.18m | 4:06PM3.08m | 5:04AM3.02m | 5:48PM3.13m | 6:46AM3.12m | 7:12PM3.41m | 7:58AM3.37m | 8:11PM3.77m | ||||||||
Low Tide | 7:59PM0.63m | 8:28AM0.72m | 8:50PM0.88m | 9:25AM1.02m | 9:57PM1.11m | 10:40AM1.25m | 11:26PM1.19m | 12:11PM1.26m | 00:57AM0.99m | 1:29PM1.03m | 2:07AM0.62m | 2:30PM0.70m | 3:02AM0.22m | ||||||||
 |  |  | |  |  | | |  |  | | | | | |  |  | | | | | |
 | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:35 | — | — | 6:37 | — | — |
 | — | 8:06 | — | — | 8:02 | — | — | 8:00 | — | — | 7:59 | — | — | 7:55 | — | — | 7:53 | — | — | 7:52 | — |
mm | 6 | — | — | — | 1 | 13 | — | — | — | — | — | — | — | — | — | — | 3 | — | — | 1 | — |
Temp °C | 16 | 17 | 18 | 17 | 17 | 16 | 15 | 17 | 16 | 14 | 14 | 16 | 19 | 21 | 18 | 16 | 16 | 14 | 15 | 15 | 14 |
Feels °C | 12 | 13 | 15 | 13 | 12 | 12 | 8 | 11 | 10 | 11 | 11 | 11 | 12 | 17 | 14 | 8 | 9 | 5 | 7 | 8 | 7 |
Swell 1 Height (m) Direction Period (s) | S 16 | SW 16 | SW 15 | SW 14 | — | SW 6 | SW 14 | NW 6 | SW 5 | SW 6 | N 4 | SW 13 | SW 13 | SW 13 | SW 12 | SW 13 | — | — | — | — | — |
| kJ | 5 | 10 | 9 | 8 | — | 120 | 8 | 1 | 23 | 18 | 1 | 7 | 7 | 6 | 6 | 27 | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | NW 4 | — | SW 14 | SW 7 | NNW 4 | WNW 3 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 4 | — | 8 | 12 | 8 | 1 | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SW 14 | — | — | SW 14 | SW 14 | NW 4 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 8 | — | — | 8 | 7 | 1 | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SSW 6 | SW 7 | SW 7 | SW 6 | — | WSW 5 | SW 5 | WNW 5 | WNW 4 | SSW 3 | SSW 4 | S 4 | SSW 6 | SW 6 | SW 5 | SW 6 | WSW 6 | WSW 6 | WSW 6 | W 6 |
| kJ | 91 | 154 | 268 | 164 | 165 | — | 155 | 98 | 39 | 3 | 7 | 16 | 19 | 81 | 138 | 94 | 258 | 215 | 333 | 272 | 411 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 259 | 261 | 283 | 290 | 298 | 168 | 541 | 283 | 173 | 44 | 256 | 172 | 390 | 181 | 198 | 296 | 167 | 583 | 830 | 783 | 283 |
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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