Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 2 Sep 2026:
- Most powerful swell: Wednesday 2 Sep, 1PM (local time) - 6ft (1.9m), 6s period, SSW swell with 281 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 1.9m 6s and forecast to arrive on Wednesday (Sep 02) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 5s period and expected on Saturday (Sep 05) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Wed 2nd Sep) | 6ft (1.9m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
G'day, Rusty here.
Well, to be honest, it's a tough spell ahead for the next week and a half at Cable Bay (Porth Trecastell). We've got a long, quiet period staring us down, with really nothing rideable until we get towards the tail end of the forecast. The first week and a half is practically a write-off, so if you're hanging for a paddle, you'll be waiting a while.
Right now, and for the next several days, the wind is just relentless. Onshore and cross-onshore winds in the 22 to 22 mph range are just mangling the water. Swell is small and weak, with short periods, and the combined energy never gets above 195 (moderate energy at best for that brief moment). For the most part, the energy is sitting in the double digits or low triple digits, which is just too weak to push any decent shape. The winds are too strong, the swell is too short-period, and the conditions are lumpy and choppy. Not worth getting wet.
By the 10th of September, there's a little kick of swell to 5ft from the NW, but the wind is still cross-on from the WSW, and the period is a low 6 seconds, so it's going to be a messy, bumpy affair. The energy hits 154 (moderate), but the quality just isn't there.
We see the wind start to go lighter and more variable around the 12th, with a couple of clean-ish windows, but the swell drops right off to barely a ripple. The 15th sees a clean, offshore breeze from the north, but the wave heights are zero. It’s a cruel joke.
The one glimmer of hope comes on the morning of the 17th of September. A 5ft swell from the SW with a period of 6 seconds rolls in, and the combined energy is a solid 142 (moderate). Crucially, the wind is light from the NNW at just 6 mph, giving us a clean, cross-offshore breeze. This is the only real standout in the entire 16 days. It's still not perfect – the short period won't give you the most powerful walls – but after two weeks of nothing, a clean head-high wave is a blessing. Get in the water, because the crowd is likely going to be there for that one after the wait.
Hang in there.
Rusty.
Short Range ForecastHeavy rain (total 24mm), heaviest during Thu night. Very mild (max 18°C on Wed night, min 15°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Sun afternoon, min 13°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
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 | SSW 6 | SW 7 | WSW 5 | WSW 5 | W 5 | WNW 5 | SW 6 | SSW 4 | SSW 4 | SSW 5 | SW 5 | SSW 5 | SW 5 | SW 6 | WSW 4 | SW 4 | W 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 122 | 185 | 244 | 124 | 143 | 163 | 100 | 77 | 117 | 17 | 11 | 10 | 25 | 35 | 55 | 22 | 63 | 73 | 43 | 16 | 35 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | on | cross-off |
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 | 7:43AM0.43m | 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 | 8 | — | — | — | 1 | 12 | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — |
Temp °C | 16 | 17 | 18 | 17 | 17 | 15 | 15 | 17 | 15 | 13 | 14 | 13 | 17 | 19 | 18 | 15 | 16 | 17 | 14 | 15 | 15 |
Feels °C | 11 | 13 | 15 | 13 | 12 | 13 | 8 | 11 | 9 | 10 | 11 | 9 | 11 | 14 | 13 | 12 | 11 | 11 | 10 | 11 | 12 |
Swell 1 Height (m) Direction Period (s) | S 16 | SW 16 | SW 15 | NW 4 | SW 14 | SW 14 | SW 14 | SW 14 | SW 7 | NNW 5 | NNW 5 | — | SW 13 | SW 13 | SW 12 | SSW 5 | — | SW 6 | SW 11 | NW 4 | S 11 |
| kJ | 5 | 10 | 9 | 4 | 8 | 8 | 8 | 8 | 2 | 15 | 8 | — | 7 | 6 | 6 | 22 | — | 73 | 5 | 4 | 2 |
Swell 2 Height (m) Direction Period (s) | — | — | — | SW 14 | — | — | — | SW 14 | SW 14 | SW 5 | WNW 4 | SW 13 | — | — | — | SW 14 | — | SW 12 | — | SW 11 | — |
| kJ | — | — | — | 8 | — | — | — | 8 | 8 | 13 | 3 | 7 | — | — | — | 8 | — | 6 | — | 4 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SSW 7 | SW 13 | — | — | — | — | — | — | — | — | S 11 | — |
| kJ | — | — | — | — | — | — | — | — | — | 5 | 7 | — | — | — | — | — | — | — | — | 2 | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SSW 6 | SW 7 | SW 7 | SSW 6 | SW 7 | WSW 5 | WSW 5 | W 5 | WNW 5 | SW 6 | SSW 4 | SSW 4 | SSW 5 | SW 5 | WNW 3 | SW 5 | WNW 5 | WSW 4 | SW 4 | W 4 |
| kJ | 122 | 185 | 244 | 124 | 143 | 163 | 100 | 77 | 117 | 17 | 11 | 10 | 25 | 35 | 55 | 4 | 63 | 52 | 43 | 16 | 35 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 259 | 261 | 313 | 287 | 495 | 168 | 173 | 521 | 173 | 185 | 244 | 158 | 276 | 181 | 272 | 44 | 338 | 319 | 44 | 211 | 172 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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