Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 7 Jul 2026:
- Most powerful swell: Saturday 11 Jul, 1PM (local time) - 1.5ft (0.5m), 6s period, NW swell with 15 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 0.5m 6s and forecast to arrive on Saturday (Jul 11) 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 1.3m 6s period and expected on Saturday (Jul 11) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Sat 11th Jul) | 1.5ft (0.5m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Hey, Rusty here again. I’m calling it like it is – Cable Bay (Porth Trecastell) is flat for the full 16-day stretch, from Tuesday 7 July through Wednesday 22 July. Not a single wave worth paddling for. The combined wave energy is pathetic – topping out at 18 (weak) on the first Tuesday, then dropping to zero most days. The water’s running a touch warmer than average, about 60°F, with a +2°F anomaly, but with no surf that doesn’t matter.
The spot needs south-west swell to light up, and we’re getting nothing from that direction. All we see are scraps – 0.2ft to 2ft – with crappy periods (2-6 seconds) or, when the period gets long (14-19 seconds), the height is just a bump. A few mornings serve up clean offshore breezes, even glassy conditions on Wednesday 15 July morning, but without any swell it’s like waiting for a bus that never comes. This break is usually fairly consistent, so this blank spell hurts. But don’t give up – it never stays poor forever, and the forecast could turn. For now, stay dry.
Rusty
Short Range ForecastMostly dry. Warm (max 20°C on Wed afternoon, min 14°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Fri morning, min 14°C on Fri night). Winds decreasing (fresh winds from the NE on Sat night, light winds from the ENE by Sun morning). | ||||||||||||||||||||
Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | |||||||||||||||
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) | WNW 4 | NW 4 | S 12 | — | — | — | NW 3 | NW 3 | — | NNE 2 | NNE 3 | N 5 | N 6 | NW 5 | N 5 | NE 5 | NE 4 | NE 5 | NE 4 | S 19 | S 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 13 | 4 | 3 | 0 | 0 | 0 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 0 | 0 | 7 | 4 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | cross-on | glassy | cross | cross | off | off | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | off | off | off | off |
High Tide | 2:59PM3.16m | 3:15AM3.47m | 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 | ||||||||
Low Tide | 9:42PM1.13m | 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 | |||||||||
 |  |  | | | | | | | | | | | |  | | | | | | | |
 | 4:58 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — |
 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 19 | 18 | 18 | 20 | 19 | 18 | 20 | 19 | 24 | 24 | 19 | 21 | 23 | 21 | 22 | 22 | 22 | 21 | 25 | 23 |
Feels °C | 13 | 17 | 16 | 18 | 20 | 19 | 17 | 19 | 18 | 23 | 23 | 17 | 20 | 20 | 17 | 21 | 18 | 17 | 15 | 20 | 17 |
Swell 1 Height (m) Direction Period (s) | WNW 4 | NW 4 | S 12 | — | — | — | S 11 | WNW 3 | — | — | — | — | NNW 6 | NW 5 | N 5 | — | — | — | — | S 19 | S 15 |
| kJ | 13 | 4 | 3 | — | — | — | 3 | 1 | — | — | — | — | 23 | 10 | 17 | — | — | — | — | 7 | 4 |
Swell 2 Height (m) Direction Period (s) | SW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | N 5 | — | — |
| kJ | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SW 3 | SW 3 | — | — | — | NW 3 | NW 3 | — | NNE 2 | NNE 3 | N 5 | N 6 | N 5 | NE 5 | NE 5 | NE 4 | NE 5 | NE 4 | NE 4 | NE 5 |
| kJ | — | 2 | 2 | — | — | — | 2 | 2 | — | 1 | 3 | 78 | 94 | 32 | 11 | 11 | 14 | 21 | 19 | 40 | 21 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 244 | 363 | 260 | 246 | 298 | 254 | 243 | 258 | 233 | 172 | 172 | 246 | 263 | 269 | 260 | 298 | 211 | 298 | 414 | 296 | 256 |
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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