Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 5 Jul 2026:
- Most powerful swell: Sunday 5 Jul, 4PM (local time) - 2.5ft (0.7m), 4s period, SW swell with 16 kJ wave energy.
Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 0.7m 4s and forecast to arrive on Sunday (Jul 05) at 4PM. Winds are predicted to be 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 Saturday (Jul 11) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sun 5th Jul) | 2.5ft (0.7m) 4s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Updates in hr min s Forecast update imminent
Hey, it’s Rusty again, in feet and miles per hour for you.
Trearddur Bay on Holy Island is looking dead quiet over this whole 16-day window. There’s no real surf to speak of. That first little bump on Sunday July 5th showed 2ft from the southwest, but with onshore wind at 9 mph and a short 6-second period, it was just a weak, choppy mess. Energy was barely 27 — nothing doing.
After that, everything drops out. From Monday the 6th onward, swells are mostly zero. A few moments with clean offshore wind — like Thursday the 9th afternoon — but that swell was just 0.7ft from the west-northwest. Not enough to ride.
From around July 8th through the 20th, it’s a long flat stretch. A tiny 0.3ft groundswell shows up on the 14th and 15th with long periods up to 18 seconds, but that’s just a ghost pulse. Doesn’t break.
Water temp is around 60°, slightly warmer than average for this time of year, but without waves you won’t be in the water much anyway.
This spot can be inconsistent, and this is a perfect example. Nothing stand-out. Forecasts can flip, but right now it’s a solid blank run.
— Rusty
Short Range ForecastMostly dry. Warm (max 20°C on Tue afternoon, min 15°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Fri night. Warm (max 23°C on Thu afternoon, min 13°C on Fri night). Winds increasing (calm on Wed night, strong winds from the NNW by Fri night). | ||||||||||||||||||||
Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | |||||||||||||||
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) | SW 6 | SW 4 | SW 4 | WSW 4 | SW 5 | SW 4 | NW 4 | NW 4 | S 12 | — | — | — | S 11 | WNW 3 | NE 3 | NNW 4 | N 4 | NNW 6 | NW 7 | NNW 5 | N 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 21 | 16 | 14 | 5 | 6 | 9 | 8 | 2 | 3 | 0 | 0 | 0 | 3 | 1 | 0 | 0 | 0 | 0 | 7 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | cross-on | on | on | cross-on | cross-on | on | on | cross-off | cross-off | off | cross-off | off | cross-off | cross-off | cross-off | cross | cross-off |
High Tide | 2:38PM4.79m | 2:50AM5.14m | 3:21PM4.72m | 3:35AM5.04m | 4:10PM4.65m | 4:27AM4.93m | 5:07PM4.59m | 5:27AM4.83m | 6:12PM4.58m | 6:36AM4.79m | 7:23PM4.67m | 7:51AM4.85m | 8:33PM4.86m | ||||||||
Low Tide | 8:38PM1.52m | 9:07AM1.25m | 9:23PM1.62m | 9:55AM1.33m | 10:15PM1.72m | 10:50AM1.43m | 11:15PM1.80m | 11:52AM1.51m | 00:24AM1.81m | 1:00PM1.53m | 1:36AM1.68m | 2:09PM1.44m | 2:44AM1.43m | ||||||||
 | |  | | | |  | |  | | | | | | | |  |  |  | |  | |
 | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — |
 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 4 | 7 | 9 | 5 |
Temp °C | 17 | 18 | 18 | 17 | 19 | 18 | 18 | 20 | 20 | 19 | 21 | 20 | 22 | 23 | 20 | 20 | 18 | 15 | 13 | 12 | 12 |
Feels °C | 15 | 16 | 16 | 15 | 16 | 16 | 15 | 17 | 18 | 20 | 21 | 20 | 20 | 20 | 17 | 19 | 14 | 9 | 7 | 5 | 4 |
Swell 1 Height (m) Direction Period (s) | NW 4 | — | — | NW 4 | WNW 3 | SW 4 | NW 4 | NW 4 | S 12 | — | — | — | S 11 | WNW 3 | — | NNW 4 | — | NNW 6 | NW 7 | — | — |
| kJ | 4 | — | — | 2 | 1 | 9 | 8 | 2 | 3 | — | — | — | 3 | 1 | — | 6 | — | 97 | 7 | — | — |
Swell 2 Height (m) Direction Period (s) | NW 4 | — | — | — | — | — | SW 4 | — | S 12 | — | — | — | — | — | — | — | — | — | W 4 | — | — |
| kJ | 2 | — | — | — | — | — | 4 | — | 3 | — | — | — | — | — | — | — | — | — | 1 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 6 | SW 4 | SW 4 | WSW 4 | SW 5 | WNW 3 | — | SSW 4 | SW 3 | — | — | — | — | — | NE 3 | — | N 4 | — | N 5 | NNW 5 | N 6 |
| kJ | 21 | 16 | 14 | 5 | 6 | 1 | — | 2 | 3 | — | — | — | — | — | 2 | — | 14 | — | 92 | 102 | 247 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 192 | 305 | 285 | 251 | 236 | 251 | 251 | 358 | 246 | 246 | 246 | 249 | 249 | 358 | 249 | 179 | 548 | 565 | 565 | 565 | 318 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Information about the Trearddur Bay (Holy Island) Surf forecast
The above surf forecast table for Trearddur Bay (Holy Island) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Trearddur Bay (Holy Island) can be found by selecting the local surf guide option on the grey menu. Our Trearddur Bay (Holy Island) 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 (Trearddur Bay (Holy Island)) 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 Trearddur Bay (Holy Island) 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 Trearddur Bay (Holy Island), camping, hotels and holiday cottages in Anglesy, consider staying in Holyhead 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 Anglesey which is 7 km (4 miles) away, Bangor, Porthmadog and Llandudno.
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