Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 27 Aug 2026:
- Most powerful swell: Wednesday 2 Sep, 7PM (local time) - 7ft (2.2m), 6s period, SW swell with 408 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 2.2m 6s and forecast to arrive on Wednesday (Sep 02) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Saturday (Aug 29) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 2nd Sep) | 7ft (2.2m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, let’s break it down for Cable Bay (Porth Trecastell). Water temp is about where it should be for this time of year – nothing unusual.
We’re looking at a long dry spell. From Thursday the 27th of August through to the 6th of September, the surf is mostly poor. Wave energy is weak to moderate, with combined energy numbers in the tens or low hundreds (like 11, 26, 38, up to 105). Swell heights are tiny, usually under 3ft, and the wind is often onshore, cross-onshore, or just messy. Thursday morning the 27th has a 0.3ft SW swell with a 12-second period and a light offshore breeze, but it’s still too small to ride. Saturday the 29th sees a 3ft SSW swell, but a fresh 30 km/h S cross-onshore wind makes it lumpy. Wednesday the 2nd of September afternoon has a 6ft SSW swell with combined energy of 235, but a fresh 30 km/h SSW cross-onshore wind spoils it.
Then Monday the 7th of September morning rolls in with a 8ft WNW swell, 7-second period, combined energy of 502 (strong energy), and a clean cross-offshore wind from the NNW at 15 km/h. That’s the standout. At 8ft, it’s only for the experienced crew – beginners should stay on the beach. The swell direction is a bit off the optimum SW, but the exposed setup and clean conditions make it the best call of the whole forecast. Crowds can be an issue here sometimes, so be ready.
After that, it fades fast. Tuesday the 8th and Wednesday the 9th are tiny or flat. Thursday the 10th has a clean 3ft SSW swell with a cross-offshore breeze, but the period is only 4 seconds – short and weak. Friday the 11th morning shows a 8ft WSW swell with a 6-second period and combined energy of 466, but the wind is cross-shore and it’s still poor surf, so don’t plan around it.
The only real shot is Monday morning the 7th of September. That’s a solid, expert-only session. The rest of the 16 days is mostly a bust.
Rusty
Short Range ForecastHeavy rain (total 41mm), heaviest during Thu afternoon. Warm (max 21°C on Wed night, min 16°C on Wed night). Winds increasing (light winds from the SW on Thu afternoon, fresh winds from the S by Sat morning). | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Tue morning. Very mild (max 17°C on Sun afternoon, min 14°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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 7 | SSW 7 | SSW 7 | SSW 4 | SSW 6 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | SW 9 | SSW 8 | SSW 7 | SW 7 | SSW 7 | SSW 7 | SW 7 | SW 7 | SW 5 | SSW 5 | SSW 6 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 4 | 9 | 16 | 35 | 76 | 83 | 105 | 123 | 59 | 42 | 33 | 53 | 35 | 36 | 22 | 21 | 23 | 37 | 235 | 195 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | on | cross-on | on | cross-on | cross-on | on | cross-on | on | cross-on | cross | cross | cross-on | on | cross-on | cross | cross-off | on | cross-on | on |
High Tide | 9:55AM3.58m | 10:04PM4.02m | 10:23AM3.73m | 10:32PM4.18m | 10:51AM3.84m | 11:00PM4.28m | 11:19AM3.92m | 11:30PM4.30m | 11:49AM3.93m | 00:03AM4.23m | 12:23PM3.87m | 00:40AM4.07m | 1:01PM3.73m | 1:22AM3.82m | |||||||
Low Tide | 4:13AM0.41m | 4:20PM0.46m | 4:45AM0.20m | 4:53PM0.30m | 5:18AM0.06m | 5:26PM0.21m | 5:52AM0.00m | 6:01PM0.20m | 6:27AM0.05m | 6:37PM0.27m | 7:03AM0.19m | 7:16PM0.42m | 7:43AM0.43m | 7:59PM0.63m | |||||||
 |  |  | |  |  |  | |  | | | | |  |  | | |  | | | | |
 | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — |
 | — | 8:20 | — | — | 8:16 | — | — | 8:15 | — | — | 8:13 | — | — | 8:09 | — | — | 8:07 | — | — | 8:06 | — |
mm | 4 | 17 | 6 | 1 | — | 4 | 8 | — | — | — | — | 1 | — | — | 2 | 3 | — | — | — | — | 9 |
Temp °C | 16 | 16 | 16 | 16 | 17 | 16 | 18 | 17 | 15 | 16 | 17 | 16 | 15 | 16 | 16 | 15 | 17 | 16 | 14 | 16 | 17 |
Feels °C | 14 | 16 | 17 | 15 | 16 | 14 | 14 | 16 | 11 | 13 | 15 | 15 | 12 | 13 | 13 | 11 | 14 | 13 | 10 | 11 | 11 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | NE 4 | SSW 7 | SSW 4 | NNW 4 | N 4 | SSW 7 | SSW 7 | SSW 8 | SW 9 | SSW 8 | SSW 7 | SW 7 | SSW 7 | SSW 7 | SW 7 | NW 4 | — | S 16 | — | SW 15 |
| kJ | 5 | 5 | 9 | 16 | 3 | 1 | 83 | 105 | 123 | 59 | 42 | 33 | 53 | 35 | 36 | 22 | 3 | — | 5 | — | 9 |
Swell 2 Height (m) Direction Period (s) | — | SSW 7 | N 4 | SW 6 | S 11 | — | — | — | — | WNW 3 | — | W 11 | W 11 | N 4 | N 4 | — | NW 4 | — | — | — | W 15 |
| kJ | — | 4 | 1 | 10 | 3 | — | — | — | — | 1 | — | 3 | 2 | 4 | 1 | — | 3 | — | — | — | 4 |
Swell 3 Height (m) Direction Period (s) | SW 12 | S 12 | S 12 | — | — | — | — | — | — | N 4 | — | — | — | SW 11 | — | — | — | — | — | — | — |
| kJ | 6 | 3 | 3 | — | — | — | — | — | — | 1 | — | — | — | 4 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 5 | — | SSW 3 | — | SSW 6 | SSW 7 | — | — | NNW 4 | — | SSW 3 | — | NW 2 | WNW 4 | WNW 3 | NW 4 | SW 7 | SW 5 | SSW 5 | SSW 6 | SW 7 |
| kJ | 18 | — | 1 | — | 35 | 76 | — | — | 16 | — | 2 | — | 1 | 5 | 6 | 7 | 21 | 23 | 37 | 235 | 195 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 258 | 211 | 211 | 221 | 272 | 96 | 106 | 44 | 167 | 44 | 44 | 44 | 44 | 44 | 261 | 287 | 286 | 172 | 45 | 495 | 261 |
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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