Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 8 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 7PM (local time) - 8ft (2.4m), 7s period, SW swell with 606 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 2.4m 7s and forecast to arrive on Thursday (Sep 10) 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 1.8m 6s period and expected on Wednesday (Sep 09) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Thu 10th Sep) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Right then, let’s have a look at what’s cookin' for Cable Bay (Porth Trecastell). I’ve gotta be straight with you—this is a tough one. The whole 16-day window is a bit of a write-off for any decent paddle surfing. The water’s hangin' in at around 63°, which is a touch warmer than average for this time of year, but that’s small comfort when there’s barely a wave worth paddling for.
The first few days are a no-go. Tuesday the 8th and Wednesday the 9th are a complete mess with strong winds and tiny, weak swell—combined energy is pretty much non-existent. Towards the end of the first week, Thursday the 10th sees a bump in swell height, hitting 8ft, but the wind is a strong cross-onshore and the period is a short, choppy 7 seconds, so it’s just a lumpy, blown-out mess. The combined energy does jump right up to 480, but it’s all noise and no shape. Honestly, that setup looks more interesting for kite surfing than for a paddle surfer.
Saturday the 12th offers a bit more size, with 6ft to 7ft, but again, the onshore wind from the SSW is strong, and the period is a poor 5-6 seconds. It’s messy and hard work. For a break that’s exposed to a SW swell, the direction is off, and the conditions are just not cooperating.
There is a tiny glimmer of hope on Sunday the 14th, where the morning gives a 2ft swell with a light cross-onshore breeze. It’s marked as marginal, but it’s the best of a bad bunch. The rest of the second week is a story of flat, tiny waves and clean, glassy conditions, but with no swell to ride. The 20th and 21st of September have some glassy, clean conditions with a 0.3ft, 14-second period swell, but that’s not enough to get excited about.
So, what’s the best on offer? Honestly, nothing stands out as a true winner. The only one that gets a mention is Sunday morning the 13th, with a tiny 2ft swell and light wind, but it’s barely a ripple. Cable Bay is a fairly consistent spot, so this blank run is a bit of a bummer, but forecasts can change. For now, I’d leave the board in the car and maybe take a long walk on the beach instead.
Rusty
Short Range ForecastLight rain (total 9mm), mostly falling on Thu afternoon. Very mild (max 17°C on Thu morning, min 13°C on Tue morning). Winds increasing (light winds from the WSW on Wed afternoon, strong winds from the SSW by Thu afternoon). | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Sat night. Very mild (max 17°C on Sat night, min 13°C on Fri morning). Winds increasing (calm on Fri afternoon, strong winds from the SSW by Sat morning). | ||||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | |||||||||||||||
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) | W 5 | W 5 | SW 6 | SW 8 | SW 8 | SW 4 | SSW 5 | SSW 7 | SSW 7 | NW 5 | SW 7 | SSW 6 | SSW 5 | SSW 6 | SW 7 | SW 7 | SSW 6 | SSW 6 | SSW 4 | SSW 4 | SW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 100 | 110 | 9 | 15 | 14 | 7 | 92 | 480 | 173 | 42 | 22 | 26 | 157 | 330 | 204 | 44 | 27 | 13 | 25 | 11 | 9 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | 11:16AM4.11m | 11:30PM4.39m | 11:50AM4.02m | 00:07AM4.16m | ||||||||
Low Tide | 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 | 5:48AM-0.24m | 5:59PM0.01m | 6:23AM-0.01m | 6:35PM0.19m | ||||||||
 |  |  |  | | | |  |  | | |  |  |  | | | | | | | | |
 | 6:37 | — | — | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — | 6:48 | — | — |
 | — | 7:52 | — | — | 7:49 | — | — | 7:46 | — | — | 7:44 | — | — | 7:42 | — | — | 7:38 | — | — | 7:37 | — |
mm | — | 1 | — | — | — | — | — | 6 | 2 | — | — | — | — | 2 | 3 | — | — | — | — | — | 1 |
Temp °C | 14 | 15 | 14 | 13 | 14 | 15 | 17 | 15 | 17 | 14 | 15 | 14 | 15 | 15 | 17 | 16 | 16 | 17 | 16 | 17 | 17 |
Feels °C | 7 | 9 | 7 | 8 | 11 | 11 | 10 | 8 | 15 | 11 | 14 | 12 | 8 | 8 | 16 | 16 | 16 | 15 | 13 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 11 | SW 11 | SW 6 | SW 8 | N 5 | SSW 7 | — | — | SSW 7 | SW 7 | SW 7 | — | — | — | — | SW 7 | SSW 6 | N 4 | — | — | SW 4 |
| kJ | 5 | 5 | 9 | 15 | 19 | 5 | — | — | 173 | 42 | 22 | — | — | — | — | 44 | 27 | 3 | — | — | 9 |
Swell 2 Height (m) Direction Period (s) | — | — | SW 11 | — | SW 8 | N 4 | — | — | — | — | NNW 4 | — | — | — | — | — | NNW 4 | — | — | S 12 | — |
| kJ | — | — | 4 | — | 14 | 1 | — | — | — | — | 6 | — | — | — | — | — | 11 | — | — | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | NW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 5 | W 5 | NW 6 | NNW 6 | W 4 | SW 4 | SSW 5 | SSW 7 | W 4 | NW 5 | WNW 4 | SSW 6 | SSW 5 | SSW 6 | SW 7 | NW 4 | NW 4 | SSW 6 | SSW 4 | SSW 4 | — |
| kJ | 100 | 110 | 224 | 100 | 4 | 7 | 92 | 480 | 7 | 35 | 3 | 26 | 157 | 330 | 204 | 12 | 4 | 13 | 25 | 11 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 187 | 1079 | 333 | 181 | 44 | 231 | 342 | 283 | 167 | 173 | 173 | 172 | 231 | 256 | 283 | 44 | 244 | 256 | 179 | 261 | 276 |
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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