Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 2 Aug 2026:
- Best quality surf: Friday 7 Aug, 10PM (local time) - 4ft (1.2m), 5s period, SW swell with glassy winds.
- Most powerful swell: Thursday 6 Aug, 1AM (local time) - 7.5ft (2.3m), 6s period, W swell with 399 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 10PM (local time) - 4ft (1.2m), 5s period with SW swell.
Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:
The surf forecast for Trearddur Bay (Holy Island) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 07) at 10PM. The primary swell is predicted to be 1.2m and 5s period with a secondary swell of 0.1m and 12s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 2.3m 6s and forecast to arrive on Thursday (Aug 06) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Thursday (Aug 06) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Fri 7th Aug) | 4ft (1.2m) 5s |
| Best Surf | 10PM (Fri 7th Aug) | 4ft (1.2m) 5s |
| Most Powerful | 1AM (Thu 6th Aug) | 7.5ft (2.3m) 6s |
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’s coming up for Trearddur Bay (Holy Island).
To be straight with you, the next week and a half is a proper struggle. We’re looking at a long stretch of poor surf conditions from now all the way through to the middle of the month. There’s a few days of tiny, weak swell with zero energy, and the wind is mostly cross or cross-on, chewing up any chance of a decent wave. The water temp is sitting around 61°, which is about average for this time of year, no big surprises there.
The first real glimmer of anything surfable doesn’t show up until Saturday the 15th of August. The morning offers a clean little 3 ft swell from the west, with a light cross-offshore breeze from the NNW. The wave energy is weak at 67, but it’s clean. It’s not going to blow your mind, but it’s surfable. That’s really the only window in the whole 16 days worth mentioning. The rest of the period is either flat, blown out, or just too small and messy to bother with.
Honestly, if you’re desperate for a paddle, that Saturday morning is your best bet. Trearddur Bay is a beginner-friendly spot, but it’s inconsistent, so don’t expect a heap of waves. The crowds are possible, so you might have some company. The wind is light and clean, which is a major positive. It’s a small, clean, mellow session, nothing more.
Beyond that, the second week fades back into tiny, clean but flat conditions. There’s a few days of clean, cross-off wind but with barely any swell. It’s a real dry spell.
Stay patient, lads. The ocean will come back around.
Rusty
Short Range ForecastSome drizzle, heaviest during Mon night. Warm (max 21°C on Mon morning, min 15°C on Tue night). Winds increasing (calm on Mon night, fresh winds from the SSW by Tue afternoon). | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Fri night. Very mild (max 17°C on Fri afternoon, min 13°C on Wed night). Winds decreasing (strong winds from the W on Wed night, calm by Fri night). | |||||||||||||||||||
Sun 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | ||||||||||||||
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 9 | W 10 | SW 9 | SW 8 | SW 8 | SSW 4 | SSW 5 | SSW 6 | SW 7 | SW 7 | W 6 | SW 6 | SW 6 | SSW 5 | WSW 5 | SSW 4 | SW 6 | SW 5 | SW 6 | SW 5 |
Wave Graph  | ||||||||||||||||||||
 kJ | 3 | 3 | 3 | 11 | 10 | 24 | 72 | 170 | 168 | 152 | 399 | 38 | 23 | 15 | 14 | 19 | 101 | 34 | 21 | 4 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | cross-on | on | on | cross-on | cross-off |
High Tide | 1:43AM5.48m | 2:07PM5.09m | 2:20AM5.40m | 2:46PM5.01m | 3:02AM5.25m | 3:31PM4.87m | 3:52AM5.04m | 4:26PM4.70m | 4:55AM4.80m | 5:37PM4.56m | 6:16AM4.64m | 7:05PM4.57m | ||||||||
Low Tide | 7:31PM1.14m | 7:56AM0.93m | 8:09PM1.21m | 8:35AM1.03m | 8:51PM1.35m | 9:20AM1.21m | 9:40PM1.55m | 10:13AM1.46m | 10:41PM1.77m | 11:18AM1.72m | 11:58PM1.91m | 12:38PM1.85m | 1:25AM1.83m | |||||||
 |  |  | |  | | |  | |  | | | | |  | | | | |  | |
 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — |
 | — | 9:12 | — | — | 9:10 | — | — | 9:08 | — | — | 9:07 | — | — | 9:05 | — | — | 9:02 | — | — | 9:00 |
mm | — | — | — | — | 1 | — | — | — | — | 1 | — | — | — | — | — | — | 4 | 2 | — | — |
Temp °C | 18 | 17 | 21 | 20 | 18 | 18 | 18 | 17 | 16 | 16 | 15 | 14 | 15 | 16 | 15 | 17 | 15 | 15 | 15 | 15 |
Feels °C | 16 | 13 | 19 | 17 | 17 | 15 | 14 | 12 | 10 | 9 | 8 | 9 | 12 | 12 | 12 | 12 | 15 | 14 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | — | SW 8 | NE 5 | SW 8 | SW 8 | SW 8 | — | — | — | — | S 13 | SW 6 | NNW 5 | SSW 5 | SW 12 | — | SW 12 | SW 5 | SW 6 | SW 5 |
| kJ | — | 3 | 5 | 11 | 10 | 9 | — | — | — | — | 3 | 38 | 23 | 15 | 6 | — | 5 | 34 | 21 | 4 |
Swell 2 Height (m) Direction Period (s) | SW 9 | W 10 | SW 9 | S 3 | — | NE 4 | — | — | — | — | — | — | WNW 4 | NNW 5 | W 12 | S 12 | — | SW 11 | S 11 | NNW 3 |
| kJ | 3 | 2 | 3 | 1 | — | 1 | — | — | — | — | — | — | 6 | 2 | 3 | 3 | — | 5 | 2 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | NE 4 | — | — | — | — | — | — | — | — | S 12 | SW 12 | — | — | — | — | — | — |
| kJ | — | — | — | 1 | — | — | — | — | — | — | — | — | 3 | 6 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | NE 3 | SSE 4 | — | — | SSW 4 | SSW 5 | SSW 6 | SW 7 | SW 7 | W 6 | NW 6 | SW 6 | WNW 3 | WSW 5 | SSW 4 | SW 6 | WNW 4 | WNW 4 | — |
| kJ | — | 9 | 1 | — | — | 24 | 72 | 170 | 168 | 152 | 399 | 115 | 23 | 1 | 14 | 19 | 101 | 20 | 11 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 249 | 163 | 186 | 192 | 241 | 280 | 273 | 280 | 284 | 283 | 378 | 51 | 273 | 210 | 246 | 246 | 114 | 249 | 51 | 163 |
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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