Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 23 Aug 2026:
- Most powerful swell: Thursday 27 Aug, 10PM (local time) - 3.5ft (1.1m), 8s period, SSW swell with 161 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 1.1m 8s and forecast to arrive on Thursday (Aug 27) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Tuesday (Aug 25) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Thu 27th Aug) | 3.5ft (1.1m) 8s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what Trearddur Bay (Holy Island) has in store for us over the next couple of weeks.
Right off the bat, I gotta be straight with you – it’s a lean run. We’re looking at a long, quiet stretch to start. The first sign of any real action doesn't show up until Sunday the 6th of September, a full week and a half from now. Before that, it’s just small, weak, and mostly wind-affected slop. Not worth paddling out for. You’d be better off checking the tide pools or going for a long walk.
Now, the one and only true standout in this whole 16-day window is Trearddur Bay itself on Sunday the 6th of September. Finally, the stars align. We get a moderate offshore wind from the ENE at 12 mph, which is going to really clean things up proper. The swell comes in from the WSW, pushing wedges of swell height of 8 ft. That’s a bit of size, over 8 ft mind you, so this is strictly for experienced surfers – beginners, sit this one out. While the period is a short 6 seconds, that combined wave energy clocks in at a solid 415, so there’s some proper grunt in the water. Given it’s a beach break, that short period might actually work in our favour, keeping the waves from closing out too straight. It won’t be perfect, but after all this flatness, it’ll feel like heaven. Expect it to be a bit busy though – crowds are sometimes an issue here, so get your spot early. The water temp is around 63°, which is a touch warmer than normal for this time of year, so a spring suit will be just fine.
Sunday afternoon continues the fun with similar conditions: 7 ft swell from the W, still 12 mph offshore from the NE, and energy of 342. Definitely the pick of the fortnight.
Other than that, the rest of the window is a write-off. Strong onshore winds, lumpy, choppy, messy – the works. A couple of days around the 2nd of September see some size (up to 7 ft) but it’s blown out by 19 mph winds from the S, making for ugly, difficult conditions. On the 4th of September, a 7 ft SSW swell rolls in with 389 energy, but again, cross-on wind from the W ruins the party. At that point, with a beach setup and that wind, it’s looking more interesting for kite surfers than paddle surfers.
So to wrap it up: endure the quiet, mark your calendar for the 6th of September, and be ready for a fun day at Trearddur Bay. After that, it fades again quickly. Hang in there.
Rusty
Short Range ForecastMostly dry. Warm (max 21°C on Tue afternoon, min 13°C on Mon night). Winds increasing (calm on Mon morning, fresh winds from the E by Tue night). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Wed night. Warm (max 20°C on Wed afternoon, min 14°C on Fri night). Winds increasing (light winds from the NW on Wed afternoon, strong winds from the WNW by Fri night). | |||||||||||||||||||
Sun 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
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 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SSW 9 | SW 8 | SW 8 | SSW 7 | SSW 4 | SSW 7 | SSW 8 | SSW 8 | SW 7 | SW 7 | WNW 5 | WSW 5 | SSW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 7 | 7 | 8 | 7 | 7 | 7 | 7 | 7 | 17 | 16 | 5 | 6 | 53 | 161 | 72 | 54 | 47 | 83 | 59 | 25 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | glassy | cross-off | cross-off | cross-off | off | cross-off | cross-on | cross | off | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 8:27PM4.49m | 9:08AM4.41m | 9:19PM4.79m | 9:52AM4.67m | 9:59PM5.08m | 10:26AM4.89m | 10:33PM5.32m | 10:57AM5.08m | 11:04PM5.51m | 11:27AM5.23m | 11:36PM5.65m | 11:57AM5.33m | 00:07AM5.72m | |||||||
Low Tide | 2:47AM2.11m | 3:05PM2.09m | 3:35AM1.78m | 3:46PM1.80m | 4:11AM1.47m | 4:21PM1.52m | 4:43AM1.19m | 4:52PM1.28m | 5:14AM0.96m | 5:23PM1.07m | 5:44AM0.80m | 5:55PM0.94m | ||||||||
 |  | | | |  | |  |  | |  | | | | |  |  | | | | |
 | — | — | 6:13 | — | — | 6:13 | — | — | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — |
 | 8:29 | — | — | 8:27 | — | — | 8:24 | — | — | 8:22 | — | — | 8:20 | — | — | 8:17 | — | — | 8:15 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | 1 | 1 | — | — | — |
Temp °C | 15 | 17 | 18 | 19 | 19 | 19 | 21 | 20 | 18 | 20 | 18 | 18 | 19 | 17 | 16 | 16 | 15 | 15 | 17 | 16 |
Feels °C | 12 | 14 | 17 | 16 | 14 | 16 | 17 | 14 | 17 | 19 | 16 | 17 | 18 | 17 | 13 | 13 | 10 | 8 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 10 | — | SW 13 | SW 13 | SW 13 | SSW 9 | SW 8 | SW 8 | SSW 4 | SSW 4 | — | SW 8 | SSW 8 | S 11 | SW 7 | SSW 6 | NNW 5 | SSW 6 |
| kJ | 7 | 7 | 4 | — | 7 | 7 | 7 | 7 | 17 | 16 | 4 | 6 | — | 112 | 72 | 3 | 47 | 28 | 9 | 25 |
Swell 2 Height (m) Direction Period (s) | — | — | SW 14 | SW 9 | SW 9 | S 8 | SW 8 | — | NNE 4 | NNE 4 | SSW 7 | SSW 7 | — | — | — | S 11 | — | — | — | — |
| kJ | — | — | 8 | 3 | 3 | 1 | 3 | — | 2 | 2 | 5 | 5 | — | — | — | 3 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | SW 14 | — | SW 13 | SW 9 | NE 5 | — | S 13 | S 13 | S 12 | S 12 | — | — | — | — | — | — | — | — | — |
| kJ | — | 7 | — | 7 | 3 | 1 | — | 3 | 3 | 3 | 3 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 4 | — | — | — | E 3 | ENE 5 | NE 5 | NE 5 | SSE 4 | S 4 | — | S 4 | SSW 7 | SSW 8 | SW 8 | SW 7 | WNW 3 | WNW 5 | WSW 5 | NW 5 |
| kJ | 2 | — | — | — | 7 | 15 | 21 | 11 | 1 | 6 | — | 6 | 53 | 161 | 55 | 54 | 2 | 83 | 59 | 21 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 287 | 163 | 246 | 249 | 249 | 252 | 249 | 189 | 189 | 267 | 273 | 186 | 51 | 51 | 219 | 325 | 195 | 326 | 386 | 51 |
Best forecast wave conditions in Anglesy | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
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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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