Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 28 Aug 2026:
- Most powerful swell: Wednesday 2 Sep, 7PM (local time) - 8ft (2.5m), 7s period, SW swell with 752 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 2.5m 7s 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 0.4m 3s period and expected on Friday (Aug 28) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 2nd Sep) | 8ft (2.5m) 7s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk Trearddur Bay.
Honestly, it’s a grim outlook for the next 16 days. Not a single session worth paddling out for. The swell shows up now and then, but the wind just spoils it every time. Trearddur Bay (Holy Island) is an inconsistent beginner spot, exposed to SW swell, but the problem is the wind is almost always cross or cross-onshore, making things lumpy and choppy.
The closest thing to a highlight is Tuesday, August 31st in the morning. There’s 1.5m of WNW swell with a 6-second period and combined energy of 220. That’s moderate energy but short-period stuff, and with a cross-shore wind at 35 km/h, it’s lumpy and messy. Not beginner-friendly, and only for those who don’t mind a fight.
By Wednesday, September 2nd afternoon, the swell jumps to 2.4m from the SW and energy hits 525—strong stuff—but the period is only 7 seconds and the wind is cross-onshore at 35 km/h. Fresh, lumpy, and pretty ugly.
The second week drops off fast. By Wednesday, September 9th, it’s flat with no swell at all, and Thursday the 10th is clean but completely flat. The water is 17°C, a touch warmer than average, but you won’t be surfing it.
Honestly, there’s nothing here to recommend. It’s a blank run, but that’s not unusual for this spot. Forecasts can change, but as it stands, save your energy.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Sat morning. Very mild (max 17°C on Fri afternoon, min 14°C on Sun night). Winds increasing (light winds from the SE on Sat morning, fresh winds from the S by Sun afternoon). | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Tue night. Very mild (max 17°C on Mon afternoon, min 13°C on Tue night). Mainly strong winds. | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 9 | SSW 8 | SSW 5 | SW 7 | WNW 6 | SW 8 | SW 7 | SSW 6 | SSW 6 | SW 5 | SW 5 | SW 7 | SW 7 | SW 5 | SW 6 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 16 | 16 | 46 | 60 | 25 | 138 | 111 | 83 | 119 | 138 | 57 | 22 | 28 | 25 | 32 | 129 | 525 | 423 | 110 | 154 | 210 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | cross | cross-off | cross-on | cross-on | cross-on | on | cross | cross-on | cross-on | on | cross-on | cross-off | cross-on | cross-on | on | cross-on | on | cross-on |
High Tide | 11:27AM5.23m | 11:36PM5.65m | 11:57AM5.33m | 00:07AM5.72m | 12:28PM5.40m | 00:40AM5.74m | 1:01PM5.41m | 1:15AM5.69m | 1:36PM5.36m | 1:53AM5.56m | 2:15PM5.23m | 2:36AM5.34m | 3:01PM5.01m | 3:30AM5.02m | |||||||
Low Tide | 5:23PM1.07m | 5:44AM0.80m | 5:55PM0.94m | 6:16AM0.70m | 6:28PM0.87m | 6:50AM0.69m | 7:04PM0.89m | 7:26AM0.78m | 7:42PM1.01m | 8:06AM0.98m | 8:25PM1.22m | 8:51AM1.28m | 9:16PM1.51m | ||||||||
 |  |  | | |  |  | | |  | | | | | |  | | | | | | |
 | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — |
 | — | 8:17 | — | — | 8:15 | — | — | 8:13 | — | — | 8:10 | — | — | 8:08 | — | — | 8:06 | — | — | 8:04 | — |
mm | 1 | — | — | 4 | 1 | 2 | 3 | 2 | — | — | — | — | — | 1 | 2 | — | 1 | 1 | 1 | 1 | 2 |
Temp °C | 16 | 17 | 16 | 16 | 16 | 16 | 17 | 16 | 16 | 15 | 17 | 17 | 15 | 17 | 15 | 15 | 16 | 17 | 17 | 18 | 16 |
Feels °C | 15 | 15 | 13 | 16 | 15 | 14 | 13 | 10 | 12 | 10 | 14 | 15 | 11 | 13 | 11 | 10 | 10 | 13 | 9 | 11 | 14 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SSW 6 | S 11 | SSW 6 | SSW 6 | SSW 9 | — | — | SW 7 | SW 8 | SW 8 | SW 7 | SSW 6 | NW 4 | — | SW 16 | — | SW 15 | SW 14 | — | SW 14 |
| kJ | 16 | 16 | 2 | 60 | 25 | 138 | — | — | 119 | 82 | 57 | 22 | 28 | 4 | — | 10 | — | 9 | 8 | — | 8 |
Swell 2 Height (m) Direction Period (s) | S 12 | N 3 | — | — | — | NNW 3 | — | — | — | — | — | N 5 | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 2 | — | — | — | 1 | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | S 11 | — | — | — | — | — | — | — | — | — | SW 8 | — | — | — | — | — | — | — | — | — |
| kJ | — | 3 | — | — | — | — | — | — | — | — | — | 11 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 3 | — | SSW 6 | — | — | — | SSW 8 | SSW 5 | — | WNW 6 | WNW 5 | W 4 | WNW 4 | SSW 6 | SW 5 | SW 5 | SW 7 | SW 7 | SW 5 | SW 6 | SW 7 |
| kJ | 2 | — | 46 | — | — | — | 111 | 83 | — | 138 | 44 | 21 | 16 | 25 | 32 | 129 | 525 | 423 | 110 | 154 | 210 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 280 | 285 | 280 | 10 | 179 | 51 | 255 | 275 | 51 | 584 | 51 | 179 | 195 | 548 | 219 | 246 | 292 | 407 | 246 | 556 | 51 |
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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