Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 8 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 1PM (local time) - 0.5ft (0.1m), 18s period, SW swell with 12 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 0.1m 18s and forecast to arrive on Tuesday (Jul 14) at 1PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Saturday (Jul 11) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Alright friends, let's chew the fat about Cable Bay (Porth Trecastell). I've been staring at the numbers, and to be perfectly honest, it's a grim outlook for the foreseeable future. We're in for a proper dry spell, so don't go getting your hopes up.
Right from the get-go, from this Wednesday morning all the way through to the 23rd of July, there's just nothing to get excited about. The swell is tiny, often flat, and when there is a blip, the energy is weak. The combined energy numbers are all under 100, mostly single or low double digits, meaning there's barely a breath of life in the water. The first hint of something doesn't show up until the morning of the 23rd of July, and even then, it's a rough one.
Let's break it down. From Wednesday the 8th of July through the 22nd, we're looking at a lot of zero readings for swell height. There are a few sessions with tiny 0.3 ft to 1.0 ft waves, but they're coming from all sorts of directions—S, NW, SE, SW—and with periods that are either super short, like 3 or 4 seconds, or crazy long like 16 to 19 seconds. That long-period groundswell from the south would normally be a treat, but with no size behind it, it's just a long wait between barely-ridable bumps. The winds are all over the place too, sometimes offshore or glassy which would be perfect, but with no swell to clean up, it's all wasted. It's a tough pill to swallow.
Now, on Thursday the 23rd of July, things finally change. The morning brings a 4 ft swell from the SSW with a short 5-second period, but the wind is screaming from the south at 19 mph, making it a lumpy, cross-onshore mess. The combined energy is still only 79—weak. The afternoon gets worse: the swell bumps up to 5 ft from the same direction, period still short at 6 seconds, and the onshore wind is still a fresh 19 mph. The combined energy finally hits 133, which is moderate, but with that wind and chop, it's going to be a washing machine. This one is strictly for the hardcore crew, if anyone at all.
Honestly, for the entire 16-day window, there isn't a single standout day. The conditions are consistently poor, and the forecast is that the surf just won't show up. It’s one of those blank runs that’s pretty normal for this spot when the swell windows don't line up. Keep an eye on it, forecasts can change, but right now, I’d be finding another way to spend my time.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Fri afternoon, min 15°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Sat night. Warm (max 22°C on Sat afternoon, min 13°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 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) | — | — | SSW 3 | S 11 | NW 3 | — | — | N 3 | N 5 | NNW 6 | N 5 | N 6 | SE 4 | NE 4 | NE 5 | NE 5 | S 19 | S 15 | S 18 | SW 18 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 1 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 7 | 4 | 6 | 12 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross | cross | off | off | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | off | off | off | off | off | off | cross-off |
High Tide | 4:00PM3.13m | 4:19AM3.39m | 5:08PM3.17m | 5:31AM3.38m | 6:16PM3.29m | 6:42AM3.46m | 7:20PM3.49m | 7:48AM3.62m | 8:18PM3.75m | 8:48AM3.79m | 9:12PM4.02m | 9:43AM3.93m | 10:03PM4.26m | ||||||||
Low Tide | 10:22AM0.89m | 10:42PM1.21m | 11:26AM0.95m | 11:55PM1.20m | 12:38PM0.92m | 1:12AM1.03m | 1:49PM0.78m | 2:21AM0.73m | 2:51PM0.57m | 3:21AM0.38m | 3:45PM0.34m | 4:14AM0.05m | 4:35PM0.16m | ||||||||
 | |  | | | |  | | |  | |  | | | | | |  | | | | |
 | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — |
 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 20 | 18 | 17 | 21 | 19 | 22 | 23 | 19 | 21 | 22 | 20 | 20 | 21 | 19 | 18 | 20 | 20 | 21 | 24 | 23 |
Feels °C | 19 | 19 | 17 | 16 | 20 | 17 | 20 | 21 | 18 | 20 | 19 | 17 | 17 | 17 | 12 | 12 | 14 | 15 | 18 | 21 | 19 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | WNW 3 | — | — | — | — | — | — | N 6 | SE 4 | — | — | ESE 3 | S 19 | S 15 | S 18 | SW 18 | SW 14 |
| kJ | — | — | — | — | 1 | — | — | — | — | — | — | 39 | 1 | — | — | 1 | 7 | 4 | 6 | 12 | 7 |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 11 | SW 4 | — | — | — | — | — | — | — | SE 4 | — | — | N 5 | — | — | — | — | — |
| kJ | — | — | — | 3 | 1 | — | — | — | — | — | — | — | 2 | — | — | 1 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | N 6 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — |
Wind waves Height (m) Direction Period (s) | — | — | SSW 3 | WNW 3 | NW 3 | — | — | N 3 | N 5 | NNW 6 | N 5 | NE 5 | NE 5 | NE 4 | NE 5 | NE 5 | NE 4 | NE 5 | NE 5 | NE 5 | NE 5 |
| kJ | — | — | 1 | 2 | 2 | — | — | 3 | 49 | 150 | 66 | 39 | 16 | 20 | 25 | 22 | 46 | 35 | 30 | 26 | 32 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 259 | 299 | 256 | 180 | 287 | 233 | 172 | 176 | 180 | 233 | 258 | 246 | 295 | 307 | 284 | 284 | 178 | 259 | 256 | 158 | 294 |
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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