Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 11 Jul 2026:
- Most powerful swell: Friday 17 Jul, 10AM (local time) - 1.5ft (0.5m), 6s period, SSW swell with 23 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 0.5m 6s and forecast to arrive on Friday (Jul 17) at 10AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Sunday (Jul 12) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Fri 17th Jul) | 1.5ft (0.5m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Alright folks, Rusty here. Let's have a look at what's on the cards for Trearddur Bay.
To be straight with you, this is a tough one. The 16-day forecast for Trearddur Bay (Holy Island) is a real blank run. We're looking at a long stretch with pretty much nothing to get excited about. From the start of the period right through until the 24th of July, it's a flat spell. The first week is a total write-off with zero swell energy. The second week doesn't offer much hope either, with tiny, weak pulses that just don't have any push. The water temp is sitting at 60°F which is about 2°F warmer than average for this time of year, but that's small comfort when there's nothing to ride.
The first real sign of life doesn't show up until the 24th of July. The best of the bunch looks like Friday morning the 24th. We'll see a small swell from the SSW pushing about 4 ft, but with a short period of 5 seconds and a cross-onshore wind from the W at 9 mph, it's going to be a bit bumpy and weak. The combined energy is only moderate (76). It's not pretty, but it's the biggest we've seen all week. Come Friday afternoon, the swell picks up a touch to 5 ft from the SW, with the combined energy hitting 144 (moderate), but the wind swings onshore from the SSW at 9 mph, making it messy. This is really only going to interest the most desperate surfers.
Then, on the 25th of July, we get a window of calm. Saturday morning the wind goes glassy, with a slight air from the west. That's a major positive for clean conditions. Unfortunately, the swell drops right back to a tiny 1 ft from the SW with a period of 7 seconds. The combined energy is a weak 32. It's a beautiful-looking morning, but there's simply no wave power to work with.
After that, the outlook returns to flat, weak, and onshore. For this area, a blank run like this is more normal than a run of good waves. It tends not to stay poor for long, but for now, the best advice is to keep the board in the shed and wait for the next change in the forecast.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Sun afternoon, min 14°C on Sun night). Winds increasing (light winds from the N on Sat morning, fresh winds from the NE by Sun afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Wed afternoon, min 16°C on Tue morning). Winds decreasing (fresh winds from the NE on Tue afternoon, light winds from the NE by Wed afternoon). | ||||||||||||||||||||
Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | |||||||||||||||
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) | NNW 5 | N 5 | NNW 5 | NE 5 | NE 4 | NE 6 | NE 4 | S 19 | S 15 | S 18 | SW 18 | SW 14 | S 6 | SW 7 | S 16 | SW 14 | SSW 6 | SW 14 | SSW 6 | SSW 6 | SSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 4 | 6 | 12 | 7 | 1 | 2 | 7 | 8 | 14 | 8 | 23 | 7 | 6 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | off | off | off | off | cross-off | off | off | cross-off | off | off | off | off | off | off |
High Tide | 8:33PM4.86m | 9:01AM5.02m | 9:34PM5.14m | 10:03AM5.23m | 10:28PM5.42m | 10:57AM5.41m | 11:18PM5.67m | 11:48AM5.52m | 00:06AM5.82m | 12:36PM5.53m | 00:52AM5.87m | 1:23PM5.44m | 1:37AM5.79m | ||||||||
Low Tide | 2:09PM1.44m | 2:44AM1.43m | 3:11PM1.28m | 3:45AM1.10m | 4:08PM1.09m | 4:40AM0.77m | 4:59PM0.91m | 5:31AM0.52m | 5:47PM0.80m | 6:20AM0.38m | 6:34PM0.77m | 7:08AM0.38m | 7:20PM0.84m | ||||||||
 |  |  |  | |  | | | | | | | | | | | | | | | | |
 | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — |
 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:36 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 23 | 23 | 22 | 24 | 22 | 19 | 21 | 19 | 21 | 24 | 24 | 23 | 28 | 27 | 25 | 25 | 24 | 22 | 24 | 23 |
Feels °C | 22 | 21 | 19 | 18 | 19 | 16 | 12 | 15 | 13 | 17 | 17 | 18 | 21 | 25 | 22 | 22 | 20 | 17 | 18 | 20 | 19 |
Swell 1 Height (m) Direction Period (s) | — | — | NNW 5 | — | — | NNE 6 | ESE 4 | S 19 | S 15 | S 18 | SW 18 | S 7 | NE 5 | NNE 4 | SSW 7 | SSW 6 | NNE 4 | — | S 12 | SSW 6 | SSW 6 |
| kJ | — | — | 17 | — | — | 3 | 1 | 7 | 4 | 6 | 12 | 1 | 12 | 8 | 4 | 4 | 1 | — | 3 | 7 | 6 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | S 8 | SW 14 | S 6 | SW 7 | SW 13 | NNE 4 | SW 14 | SW 12 | — | SW 12 | SW 12 |
| kJ | — | — | — | — | — | — | — | — | — | — | 1 | 7 | 1 | 2 | 7 | 1 | 8 | 6 | — | 6 | 6 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | W 14 | — | — | — | S 6 | S 16 | SW 14 | — | SW 14 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 4 | — | — | — | 1 | 5 | 8 | — | 8 | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 5 | N 5 | NE 4 | NE 5 | NE 4 | NE 6 | NE 4 | NE 5 | NE 4 | NE 4 | NNE 5 | NE 5 | — | — | ENE 4 | — | SSW 6 | SSW 3 | SSW 6 | SW 3 | — |
| kJ | 25 | 15 | 4 | 21 | 40 | 43 | 34 | 49 | 18 | 27 | 46 | 58 | — | — | 7 | — | 14 | 5 | 23 | 3 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 267 | 260 | 249 | 287 | 208 | 305 | 284 | 284 | 286 | 184 | 208 | 267 | 208 | 267 | 306 | 353 | 184 | 184 | 184 | 418 | 306 |
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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