Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 27 Aug 2026:
- Most powerful swell: Wednesday 2 Sep, 7PM (local time) - 7ft (2.2m), 6s period, SW swell with 408 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 2.2m 6s and forecast to arrive on Wednesday (Sep 02) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Saturday (Aug 29) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 2nd Sep) | 7ft (2.2m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, let's have a look at what's on the cards for the next couple of weeks. I'm gonna be straight with you – it's a tough stretch for the most part, but there's a glimmer of hope if you're willing to be patient.
The water temp here at Trearddur Bay (Holy Island) is sitting at 63°F, which is a touch warmer than normal for this time of year. Not a bad thing if you're in a spring suit.
Right now, through the end of August and into early September, it's pretty flat and messy. We've got a long run of days with next to no swell. Most of the energy is weak, with combined energy values down in the single and double digits, like 15 (Wednesday 26th) and a measly 11 (Thursday 27th). The few tiny bumps we get, like 1 ft on Wednesday 26th, are coming from the SSW, but with a short period of 8 seconds, there's just no power. The wind is all over the place, and while we see some clean conditions on Thursday 27th morning with an offshore ENE wind at 16 mph, the swell is only 0.3 ft – you couldn't get a ride on a leaf.
Friday 28th sees a slight bump to 3 ft from the SSW, but with a period of only 5 seconds and a cross-on SW wind, it's lumpy and poor. The energy is still weak at 51. This pattern of poor surf continues day after day. We get a little more size on the 1st of September, with 6 ft from the west, but the wind is a fresh cross-on from the WNW at 19 mph, making it choppy and blown out. The energy is moderate at 230, but it's just not surfable.
There's a big gap with no real quality options until we get to the 5th of September. That's when things get interesting. Saturday morning the 5th brings a solid 8 ft swell from the SW, with a period of 7 seconds. The combined energy jumps right up to 698, which is strong. The wind is a light cross-shore from the WNW at 6 mph, which should keep it fairly clean. Now, 8 ft is getting into expert-only territory, and with that short period, it's going to be a bit of a wall of white water, not a classic clean face. Still, it's the only real size on offer, and if you're an experienced local who knows how to handle a thumping shorebreak, it might be your best shot. Just be aware the wind is cross, not offshore, so it won't be perfect.
After that, it fades back down. Sunday 6th and Monday 7th are back to small, weak, and onshore. The forecast for the second week is pretty barren, with tiny swells and strong winds, including a near gale from the west on the 9th. The 10th of September shows zero swell.
So, to be honest, the standout is that Saturday morning, 5th of September. It's not a classic, clean swell, but it's the only time we get any real power. For everyone else, expect a lot of flat, choppy days. If you're looking for something to do, the conditions on many of these days with strong cross-onshore wind and good-sized chop might actually be more interesting for kite surfing than paddle surfing.
Keep an eye on the forecast, but don't get your hopes up too high for the next week.
Rusty
Short Range ForecastHeavy rain (total 36mm), heaviest during Thu afternoon. Warm (max 21°C on Wed night, min 16°C on Wed night). Winds increasing (calm on Thu night, fresh winds from the S by Sat morning). | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Mon night. Very mild (max 17°C on Sun afternoon, min 14°C on Sat night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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) | SSW 7 | SSW 7 | SSW 7 | SSW 4 | SSW 6 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | SW 9 | SSW 8 | SSW 7 | SW 7 | SSW 7 | SSW 7 | SW 7 | SW 7 | SW 5 | SSW 5 | SSW 6 | SW 7 |
Wave Graph | |||||||||||||||||||||
6 | 4 | 9 | 16 | 35 | 76 | 83 | 105 | 123 | 59 | 42 | 33 | 53 | 35 | 36 | 22 | 21 | 23 | 37 | 235 | 195 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | glassy | cross-on | on | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | cross | cross-on | on | cross-on | cross | cross-off | on | cross-on | on |
High Tide | 10:57AM5.08m | 11:04PM5.51m | 11:27AM5.23m | 11:36PM5.65m | 11:57AM5.33m | 00:07AM5.72m | 12:28PM5.40m | 00:40AM5.74m | 1:01PM5.41m | 1:15AM5.69m | 1:36PM5.36m | 1:53AM5.56m | 2:15PM5.23m | 2:36AM5.34m | |||||||
Low Tide | 4:43AM1.19m | 4:52PM1.28m | 5:14AM0.96m | 5:23PM1.07m | 5:44AM0.80m | 5:55PM0.94m | 6:16AM0.70m | 6:28PM0.87m | 6:50AM0.69m | 7:04PM0.89m | 7:26AM0.78m | 7:42PM1.01m | 8:06AM0.98m | 8:25PM1.22m | |||||||
6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | |
— | 8:20 | — | — | 8:17 | — | — | 8:15 | — | — | 8:13 | — | — | 8:10 | — | — | 8:08 | — | — | 8:06 | — | |
mm | 3 | 16 | 5 | 1 | — | 3 | 7 | — | 1 | — | — | 1 | — | — | 2 | 2 | — | — | — | — | 9 |
Temp °C | 16 | 16 | 16 | 16 | 17 | 17 | 18 | 17 | 15 | 16 | 17 | 17 | 15 | 16 | 16 | 15 | 17 | 16 | 14 | 16 | 17 |
Feels °C | 14 | 15 | 16 | 15 | 16 | 15 | 13 | 16 | 11 | 13 | 15 | 15 | 11 | 13 | 12 | 11 | 13 | 12 | 9 | 10 | 11 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | NE 4 | SSW 7 | SSW 4 | NNW 4 | N 4 | SSW 7 | SSW 7 | SSW 8 | SW 9 | SSW 8 | SSW 7 | SW 7 | SSW 7 | SSW 7 | SW 7 | NW 4 | — | S 16 | — | SW 15 |
5 | 5 | 9 | 16 | 3 | 1 | 83 | 105 | 123 | 59 | 42 | 33 | 53 | 35 | 36 | 22 | 3 | — | 5 | — | 9 | |
Swell 2 Height (m) Direction Period (s) | — | SSW 7 | N 4 | SW 6 | S 11 | — | — | — | — | WNW 3 | — | W 11 | W 11 | N 4 | N 4 | — | NW 4 | — | — | — | W 15 |
— | 4 | 1 | 10 | 3 | — | — | — | — | 1 | — | 3 | 2 | 4 | 1 | — | 3 | — | — | — | 4 | |
Swell 3 Height (m) Direction Period (s) | SW 12 | S 12 | S 12 | — | — | — | — | — | — | N 4 | — | — | — | SW 11 | — | — | — | — | — | — | — |
6 | 3 | 3 | — | — | — | — | — | — | 1 | — | — | — | 4 | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NE 5 | — | SSW 3 | — | SSW 6 | SSW 7 | — | — | NNW 4 | — | SSW 3 | — | NW 2 | WNW 4 | WNW 3 | NW 4 | SW 7 | SW 5 | SSW 5 | SSW 6 | SW 7 |
18 | — | 1 | — | 35 | 76 | — | — | 16 | — | 2 | — | 1 | 5 | 6 | 7 | 21 | 23 | 37 | 235 | 195 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 249 | 208 | 208 | 219 | 273 | 88 | 101 | 51 | 174 | 51 | 51 | 51 | 51 | 51 | 252 | 290 | 289 | 179 | 51 | 503 | 251 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











