Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 4 Aug 2026:
- Most powerful swell: Wednesday 5 Aug, 1PM (local time) - 5ft (1.6m), 6s period, WSW 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 1.6m 6s and forecast to arrive on Wednesday (Aug 05) 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 0.7m 6s period and expected on Thursday (Aug 06) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Wed 5th Aug) | 5ft (1.6m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, let’s get this out there. To be honest with you, the next couple of weeks are looking pretty flat and messy for Trearddur Bay (Holy Island). If you’re hanging out for a proper surf, you’re going to be waiting a while. The wind is mostly cross or onshore, and the swell is small and weak. The water temp is sitting at 62°F, which is about 2°F warmer than normal for this time of year, so it’s not going to be a shock to the system when you get in.
The first real chance of anything comes on Thursday, August 14th. It’s not big, but there’s a little pulse of SSW swell around 4ft to 5ft. The period is a short 5 to 6 seconds, so it’s going to be a bit crumbly and disorganized. The big positive is the wind. Thursday morning is glassy, and the afternoon goes light cross-offshore from the NW, which will keep the surface clean. The combined energy is 87 to 129, which is moderate, but it’s the cleanest we’ll see. This is your best bet, and honestly, it’s the only one that’s even worth a look. It’s an inconsistent wave, so be prepared to wait for sets.
Before that, the surf is basically non-existent. From the 4th through the 13th, it’s all under 5ft, most of it under 3ft, with lumpy, cross-onshore conditions. There’s nothing rideable. The energy is weak, mostly under 100, and the wind is just messing it up.
After that little pulse on the 14th, it fades fast again. The 15th has some similar sized swell, but the wind swings cross-onshore and it gets chopped up. After that, it’s back to tiny, weak, and mostly onshore slop. The week after the 14th is not worth planning around. The energy peters out to nothing, and the wind is all over the place.
There’s a mention of a SSW swell on the 17th with a bit more energy at 175, but the wind is onshore and the period is only 7 seconds, so it’s going to be a mess. Not worth your time.
So, bottom line: if you’re keen, get out on Thursday the 14th. It’s not going to be epic, but it’s the only clean option on offer. The rest of the window is a write-off for surfing. With the lack of consistent swell and the constant wind, it might be more interesting for the kite surfers than us paddle surfers. Keep an eye on it, but don’t hold your breath.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Wed afternoon. Very mild (max 18°C on Tue afternoon, min 13°C on Wed night). Winds decreasing (fresh winds from the W on Wed morning, light winds from the WNW by Thu night). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sun night. Very mild (max 18°C on Sun afternoon, min 13°C on Sun night). Winds decreasing (fresh winds from the SSW on Sat afternoon, light winds from the WSW by Sun morning). | |||||||||||||||||||
Tue 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 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) | SSW 5 | SSW 5 | W 5 | WSW 5 | WNW 5 | NW 6 | WSW 4 | SW 4 | NW 4 | S 12 | SW 4 | SSW 4 | SSW 4 | SW 5 | SW 4 | SW 7 | W 3 | NW 4 | NW 4 | SW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 64 | 49 | 117 | 113 | 133 | 86 | 9 | 9 | 6 | 3 | 18 | 16 | 21 | 34 | 5 | 7 | 6 | 9 | 5 | 1 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | off |
High Tide | 3:02AM5.25m | 3:31PM4.87m | 3:52AM5.04m | 4:26PM4.70m | 4:55AM4.80m | 5:37PM4.56m | 6:16AM4.64m | 7:05PM4.57m | 7:47AM4.68m | 8:27PM4.80m | 9:03AM4.91m | 9:30PM5.16m | ||||||||
Low Tide | 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 | 1:59PM1.77m | 2:41AM1.51m | 3:06PM1.52m | 3:41AM1.10m | |||||||
 |  | |  | |  | |  | | | | | | |  | |  | | | | |
 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — | 5:47 | — | — | 5:48 | — | — |
 | — | 9:08 | — | — | 9:07 | — | — | 9:05 | — | — | 9:02 | — | — | 9:00 | — | 8:59 | — | — | 8:57 | — |
mm | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — |
Temp °C | 18 | 17 | 15 | 16 | 15 | 14 | 15 | 16 | 15 | 16 | 16 | 16 | 17 | 16 | 17 | 18 | 17 | 14 | 15 | 15 |
Feels °C | 15 | 13 | 8 | 10 | 8 | 10 | 12 | 14 | 12 | 13 | 12 | 12 | 12 | 12 | 15 | 15 | 17 | 11 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | — | SSW 5 | — | S 13 | SW 6 | SW 6 | N 5 | SW 4 | NW 4 | WNW 3 | SW 12 | SW 11 | S 11 | SW 5 | SW 4 | SW 7 | SW 6 | — | NW 4 | SW 6 |
| kJ | — | 49 | — | 3 | 19 | 9 | 13 | 9 | 3 | 1 | 5 | 5 | 2 | 34 | 5 | 7 | 2 | — | 5 | 1 |
Swell 2 Height (m) Direction Period (s) | — | SW 7 | — | — | SW 13 | S 13 | S 12 | N 4 | SW 4 | S 12 | — | — | — | SW 8 | SW 7 | NW 3 | — | SW 6 | SSW 6 | — |
| kJ | — | 12 | — | — | 7 | 3 | 3 | 1 | 5 | 3 | — | — | — | 2 | 2 | 2 | — | 1 | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 12 | SW 12 | SW 12 | SW 6 | — | — | S 13 | — | S 12 | SW 12 | — | — | S 12 | — |
| kJ | — | — | — | — | — | — | 6 | 6 | 6 | 1 | — | — | 3 | — | 3 | 6 | — | — | 3 | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | WNW 4 | W 5 | WSW 5 | WNW 5 | NW 6 | WSW 4 | — | — | SW 2 | SW 4 | SSW 4 | SSW 4 | — | NW 3 | — | W 3 | NW 4 | — | — |
| kJ | 64 | 11 | 117 | 113 | 133 | 86 | 9 | — | — | 2 | 18 | 16 | 21 | — | 3 | — | 6 | 9 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 280 | 88 | 498 | 476 | 378 | 284 | 273 | 283 | 283 | 235 | 246 | 246 | 246 | 251 | 323 | 292 | 311 | 277 | 384 | 246 |
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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