Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 3 Aug 2026:
- Most powerful swell: Thursday 6 Aug, 4AM (local time) - 7ft (2.1m), 6s period, W swell with 325 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 Thursday (Aug 06) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 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 | 4AM (Thu 6th Aug) | 7ft (2.1m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, let’s talk Trearddur Bay. Honestly, mate, it’s a rough one. The whole 16-day stretch is flat as a pancake. Every single time slot is showing poor surf conditions, so there’s no real day to get fired up about. We’re looking at a long, empty run here.
The only break in the picture is Trearddur Bay (Holy Island). It’s a beginner-friendly spot, but it’s inconsistent and rarely breaks. That’s pretty normal for this area, so a stretch like this isn’t unexpected. The swell just isn’t showing.
Let’s go through it. Monday the 3rd starts with a tiny 0.3 ft swell from the SW with a 9-second period, but cross-shore winds make it messy. Basically a pond. Tuesday the 4th sees a little more energy, with a 4 ft swell from the SSW in the morning, but the wind is a fresh cross-onshore at 30 km/h, making it lumpy. The combined energy is only 73 – weak. Wednesday the 5th actually has some size, with 7 ft from the SW in the morning, but it’s onshore with a strong 35 km/h wind, so it’s blown out. That’s too big for beginners, and the quality is poor. The energy hits 305 (moderate), but the wind kills it.
The rest of the week fades fast. Thursday the 6th has 5 ft from the NW but with a cross-shore chop, and it drops off quickly after that. From Friday the 7th through to the 18th, we’re looking at swell heights of 0.3 ft or less, with only a few moments of clean conditions. Sunday the 9th and Monday the 10th have light offshore or cross-off winds and clean surfaces, but the swell is just a ripple – 1 ft and 0.3 ft. The energy is in the single digits. You’d be struggling to get wet.
The water temperature is about average for the time of year, nothing unusual. For an inconsistent beginner spot, this is a total write-off. If you’re really keen, the cleanest windows are on the 9th and 10th of August, but you’ll need a log and a lot of patience. Otherwise, it’s a good time to look at the kite gear if you’ve got it – the 5th and 6th have some wind and swell, but for a paddle, it’s a no-go.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Mon night. Warm (max 21°C on Mon morning, min 15°C on Tue night). Winds increasing (calm on Mon afternoon, strong winds from the WSW by Wed afternoon). | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Fri afternoon, min 14°C on Wed night). Winds decreasing (strong winds from the W on Wed night, light winds from the WNW by Thu night). | ||||||||||||||||||||
Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | |||||||||||||||
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) | SSE 4 | SW 8 | SW 8 | SSW 5 | SSW 5 | SSW 6 | SW 6 | SW 6 | W 6 | NW 6 | SW 6 | SW 5 | SW 5 | SW 5 | SW 4 | SW 4 | SW 4 | SSW 4 | SW 5 | SSW 5 | SSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 11 | 10 | 64 | 80 | 176 | 305 | 239 | 289 | 136 | 23 | 12 | 7 | 6 | 15 | 17 | 17 | 13 | 7 | 3 | 5 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | cross | on | cross-on | on | cross-on | cross-on | on | on | cross | cross-off | cross-off | off |
High Tide | 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 | 7:47AM4.68m | 8:27PM4.80m | ||||||||
Low Tide | 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 | 1:59PM1.77m | 2:41AM1.51m | |||||||
 |  |  | | | |  | |  | | |  | | |  | | | | | | | |
 | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — | 5:47 | — | — |
 | — | — | 9:10 | — | — | 9:08 | — | — | 9:07 | — | — | 9:05 | — | — | 9:02 | — | — | 9:00 | — | 8:59 | — |
mm | — | — | 2 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 21 | 19 | 18 | 18 | 16 | 16 | 17 | 15 | 14 | 16 | 16 | 15 | 17 | 17 | 15 | 17 | 17 | 15 | 17 | 16 |
Feels °C | 20 | 18 | 18 | 15 | 14 | 11 | 8 | 9 | 8 | 9 | 13 | 13 | 14 | 13 | 13 | 11 | 14 | 15 | 13 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | NE 4 | S 4 | SW 8 | SW 8 | — | — | — | WNW 6 | SW 13 | SW 6 | NNW 6 | SW 5 | SW 5 | — | SW 12 | SW 11 | S 11 | S 11 | SW 5 | WNW 3 | SW 3 |
| kJ | 3 | 2 | 10 | 9 | — | — | — | 4 | 7 | 36 | 46 | 12 | 7 | — | 5 | 5 | 2 | 2 | 7 | 1 | 3 |
Swell 2 Height (m) Direction Period (s) | SW 9 | SW 8 | — | NE 4 | — | — | — | — | — | S 13 | WNW 4 | NNW 5 | NNW 4 | S 12 | — | — | — | — | SW 9 | SW 8 | SSW 7 |
| kJ | 3 | 11 | — | 1 | — | — | — | — | — | 3 | 6 | 5 | 1 | 3 | — | — | — | — | 3 | 2 | 5 |
Swell 3 Height (m) Direction Period (s) | — | NE 4 | — | — | — | — | — | — | — | — | S 12 | SW 12 | SW 12 | — | — | — | — | — | — | — | S 12 |
| kJ | — | 1 | — | — | — | — | — | — | — | — | 3 | 6 | 6 | — | — | — | — | — | — | — | 3 |
Wind waves Height (m) Direction Period (s) | SSE 4 | — | SSW 4 | SSW 5 | SSW 5 | SSW 6 | SW 6 | SW 6 | W 6 | NW 6 | SW 6 | — | NW 4 | SW 5 | SW 4 | SW 4 | SW 4 | SSW 4 | — | SSW 5 | — |
| kJ | 2 | — | 1 | 64 | 80 | 176 | 305 | 239 | 289 | 136 | 23 | — | 3 | 6 | 15 | 17 | 17 | 13 | — | 3 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 155 | 267 | 189 | 280 | 280 | 280 | 283 | 459 | 586 | 325 | 273 | 283 | 280 | 251 | 312 | 376 | 407 | 208 | 163 | 312 | 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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