Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 4 Sep 2026:
- Most powerful swell: Tuesday 8 Sep, 10AM (local time) - 7ft (2.1m), 6s period, SW swell with 337 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 2.1m 6s and forecast to arrive on Tuesday (Sep 08) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Sep 09) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Tue 8th Sep) | 7ft (2.1m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Right folks, Rusty here. Let’s be straight with you: the next 16 days look like a write-off for Trearddur Bay. I’ve looked at every bit of the forecast and there’s just nothing to get excited about. The whole period from now, right through to the 19th of September, is a total dud. You’ve got a gap of over two weeks with no surf worth mentioning.
We start off with a bit of swell on the 4th, but it’s a messy 5ft from the WSW with a short, weak 6-second period and a cross-on wind blowing at 18 mph. The water’s a touch warmer than usual at 63°F but the conditions are just poor. The energy in the water is weak anyway (127). It’s the same story day after day: a bit of height, but always cross-on or onshore wind, and the period is nearly always short. The 8th brings a 7ft swell from the SW, but with a 6-second period and a strong 25 mph cross-on wind, it’s a messy, blown-out mess. That’s not for anyone but experts, and even then, it’s not a surfer’s wave—it’s a kite surfer’s dream.
The 12th and 13th are flat. The 15th has a bit of a cleaner cross-off wind, but the swell is non-existent. Honestly, the whole run is a blank. Trearddur Bay is inconsistent at the best of times, and this is one of those times. The swell direction is from the SW, which is the optimum for the spot, but the wind is always wrong, and the energy is weak. There’s no standout day, no hidden gem. With the conditions as they are, this setup is much more interesting for kite surfing than paddle surfing for the first week. After that, it’s flat. Don’t hold your breath—forecasts can change, but right now, this is a long, hard wait.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Sat night. Very mild (max 19°C on Sun afternoon, min 13°C on Fri night). Winds increasing (light winds from the SW on Sat morning, strong winds from the S by Sun morning). | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Thu morning. Very mild (max 16°C on Wed afternoon, min 13°C on Mon night). Winds decreasing (strong winds from the WSW on Tue morning, light winds from the WSW by Wed night). | |||||||||||||||||||
Fri 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | ||||||||||||||
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) | WSW 6 | W 5 | W 5 | SW 6 | SSW 4 | SSW 5 | SSW 6 | SW 6 | SW 14 | SW 6 | SW 6 | SW 6 | WSW 6 | W 6 | NW 6 | SW 6 | W 4 | SW 6 | SW 6 | SW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 119 | 115 | 59 | 25 | 28 | 70 | 129 | 137 | 51 | 195 | 182 | 337 | 216 | 274 | 221 | 23 | 15 | 131 | 109 | 65 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on |
High Tide | 4:41AM4.69m | 5:21PM4.55m | 6:18AM4.51m | 7:01PM4.59m | 7:54AM4.65m | 8:23PM4.91m | 9:02AM4.96m | 9:21PM5.29m | 9:53AM5.26m | 10:08PM5.63m | 10:36AM5.47m | 10:49PM5.85m | ||||||||
Low Tide | 10:23PM1.82m | 10:59AM2.01m | 11:50PM1.99m | 12:31PM2.14m | 1:25AM1.84m | 1:57PM1.96m | 2:38AM1.44m | 3:00PM1.61m | 3:33AM1.02m | 3:50PM1.24m | 4:19AM0.68m | 4:32PM0.95m | ||||||||
 |  |  | |  | | |  |  |  | |  | | | | |  |  | |  | |
 | — | — | 6:33 | — | — | 6:35 | — | — | 6:37 | — | — | 6:39 | — | — | 6:39 | — | — | 6:41 | — | — |
 | 8:01 | — | — | 7:59 | — | — | 7:57 | — | — | 7:53 | — | — | 7:52 | — | — | 7:50 | — | — | 7:46 | — |
mm | — | — | — | — | 7 | — | — | — | — | 2 | — | 1 | — | — | — | — | 1 | 10 | 1 | — |
Temp °C | 17 | 15 | 14 | 14 | 15 | 18 | 19 | 17 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 16 | 15 | 16 | 18 | 17 |
Feels °C | 11 | 8 | 11 | 10 | 10 | 10 | 13 | 13 | 9 | 8 | 9 | 7 | 8 | 6 | 7 | 11 | 10 | 12 | 15 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 14 | NW 4 | SW 13 | SW 13 | SW 13 | SW 12 | SW 14 | — | — | — | — | — | SW 6 | NNW 6 | NNW 5 | — | — | SW 7 |
| kJ | 8 | 8 | 7 | 4 | 7 | 7 | 6 | 6 | 33 | — | — | — | — | — | 47 | 59 | 21 | — | — | 65 |
Swell 2 Height (m) Direction Period (s) | — | — | — | NNW 5 | — | — | — | — | SW 14 | — | — | — | — | — | — | SW 6 | SW 6 | — | — | — |
| kJ | — | — | — | 2 | — | — | — | — | 51 | — | — | — | — | — | — | 20 | 2 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | SW 13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 6 | W 5 | W 5 | SW 6 | SSW 4 | SSW 5 | SSW 6 | SW 6 | WSW 4 | SW 6 | SW 6 | SW 6 | WSW 6 | W 6 | NW 6 | WNW 5 | W 4 | SW 6 | SW 6 | WNW 3 |
| kJ | 119 | 115 | 59 | 25 | 28 | 70 | 129 | 137 | 27 | 195 | 182 | 337 | 216 | 274 | 221 | 23 | 15 | 131 | 109 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 514 | 179 | 192 | 246 | 186 | 238 | 346 | 219 | 246 | 514 | 174 | 348 | 625 | 781 | 379 | 273 | 246 | 273 | 280 | 280 |
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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