Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 24 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 1PM (local time) - 5ft (1.5m), 6s period, WNW swell with 138 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 1.5m 6s and forecast to arrive on Sunday (Jul 26) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 4s period and expected on Friday (Jul 24) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Sun 26th Jul) | 5ft (1.5m) 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 cooking for Trearddur Bay on Holy Island.
To be straight with you, the next 16 days are looking pretty grim for a paddle. We've got a long stretch of nothing worthwhile. The first proper chance of a wave doesn't show up until Sunday morning, July 26th, and even then, it’s a struggle. Before that, from Friday the 24th through to Saturday the 26th, it’s all tiny, wind-affected slop – we’re talking 0.3 feet to 3 feet of messy, short-period junk with onshore winds. You’d be better off staying in bed.
The first real spike of energy comes on Sunday morning, July 26th. The swell bumps up to 4 feet from the WNW, but it’s a short 5-second period with a fresh cross-onshore wind at 19 mph. The water’s got a moderate amount of energy behind it (105), but the conditions are lumpy and poor. It’s a beach and reef setup, and with the wind howling, it honestly looks more interesting for kite surfing than paddle surfing. The wind stays on it all day, and the quality doesn’t improve.
We get a bit of a pulse on Sunday, August 2nd. The afternoon brings a 8 feet swell from the SSW, with a 7-second period. That’s a lot of power (523), but it’s all onshore wind at 22 mph, making it a messy, poor option. That size is really only for the experienced crew, and with the wind, it’s a washing machine. The next morning, Monday the 3rd, still has a solid 6 feet from the SW (282), but again, it’s cross-onshore and choppy.
Honestly, there isn’t a single standout window in this whole 16-day stretch. Every single time slot is scored as poor surf conditions. The swell direction is mostly from the SSW or W, which for Trearddur Bay (Holy Island) is okay, but the wind is never in our favour. The water temp is about average for the time of year, so no surprises there.
The most consistent thing we see is the wind blowing from the wrong direction. Keep the board in the van for now, lads. This one’s a write-off.
- Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Sat morning. Very mild (max 18°C on Sat night, min 13°C on Thu night). Winds increasing (calm on Thu night, fresh winds from the WNW by Sun morning). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Mon night. Very mild (max 18°C on Tue afternoon, min 14°C on Sun night). Winds decreasing (fresh winds from the SSW on Mon afternoon, calm by Wed afternoon). | ||||||||||||||||||||
Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | |||||||||||||||
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) | S 13 | S 13 | SW 3 | W 4 | WSW 5 | WSW 4 | WNW 5 | NW 5 | NW 5 | NW 4 | SSW 4 | SSW 5 | SSW 5 | SSW 5 | SW 5 | SW 4 | SW 4 | SW 4 | SW 4 | SSW 3 | — |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 3 | 3 | 27 | 37 | 18 | 83 | 82 | 43 | 12 | 18 | 61 | 67 | 59 | 32 | 9 | 4 | 9 | 4 | 1 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | glassy | cross-on | on | cross-on |
High Tide | 7:10AM4.28m | 7:50PM4.38m | 8:27AM4.33m | 8:53PM4.58m | 9:25AM4.48m | 9:42PM4.82m | 10:10AM4.66m | 10:22PM5.05m | 10:47AM4.83m | 10:57PM5.25m | 11:21AM4.96m | 11:31PM5.40m | 11:54AM5.05m | 00:03AM5.49m | |||||||
Low Tide | 1:29PM2.12m | 2:05AM2.17m | 2:34PM2.05m | 3:07AM1.98m | 3:25PM1.90m | 3:54AM1.74m | 4:07PM1.71m | 4:33AM1.50m | 4:44PM1.52m | 5:08AM1.29m | 5:17PM1.36m | 5:41AM1.11m | 5:50PM1.23m | ||||||||
 | |  |  |  |  |  | | | | | | | | | | | | | |  | |
 | 5:20 | — | — | 5:22 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:30 | — | — |
 | — | — | 9:27 | — | — | 9:25 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 | — | — | 9:19 | — | — | 9:17 |
mm | — | — | — | 1 | — | 1 | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | 1 |
Temp °C | 14 | 17 | 17 | 15 | 16 | 18 | 16 | 17 | 17 | 15 | 16 | 16 | 17 | 18 | 17 | 15 | 16 | 17 | 20 | 20 | 18 |
Feels °C | 12 | 14 | 16 | 11 | 13 | 15 | 10 | 12 | 13 | 10 | 10 | 12 | 12 | 14 | 15 | 14 | 15 | 16 | 17 | 19 | 15 |
Swell 1 Height (m) Direction Period (s) | N 4 | WNW 3 | SW 3 | S 12 | S 12 | S 11 | SW 5 | SW 6 | SW 5 | NW 4 | N 4 | — | — | — | — | SW 4 | — | SW 4 | SW 4 | SSW 3 | — |
| kJ | 3 | 1 | 3 | 3 | 3 | 2 | 22 | 16 | 5 | 12 | 1 | — | — | — | — | 9 | — | 9 | 4 | 1 | — |
Swell 2 Height (m) Direction Period (s) | S 13 | N 4 | — | — | — | — | — | — | — | SW 5 | NW 4 | — | — | — | — | — | — | — | — | SW 5 | — |
| kJ | 3 | 1 | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | 1 | — |
Swell 3 Height (m) Direction Period (s) | — | S 13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | WSW 3 | W 4 | WSW 5 | WSW 4 | WNW 5 | NW 5 | NW 5 | SW 3 | SSW 4 | SSW 5 | SSW 5 | SSW 5 | SW 5 | — | SW 4 | — | — | — | — |
| kJ | — | — | 2 | 27 | 37 | 18 | 83 | 82 | 43 | 2 | 18 | 61 | 67 | 59 | 32 | — | 4 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 415 | 1084 | 251 | 1085 | 376 | 192 | 312 | 299 | 192 | 246 | 289 | 246 | 332 | 251 | 246 | 246 | 251 | 246 | 249 | 249 | 394 |
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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