Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 9 Jul 2026:
- Most powerful swell: Saturday 11 Jul, 10AM (local time) - 1.5ft (0.5m), 6s period, NW swell with 16 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 Saturday (Jul 11) at 10AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Saturday (Jul 11) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Sat 11th 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 offer for Trearddur Bay on Holy Island. I’ll be straight with you – it’s a lean run. The first couple of weeks are pretty much a write-off for any proper paddle surfing. The groundswell that does show up is tiny, and the energy just isn't there. The first real glimmer of something surfable doesn't show up until the very end of the forecast. For a fairly exposed spot, this is a long, quiet spell.
Through the first week, from Thursday the 9th of July through to the middle of the next week, it’s all about flat spells or tiny, un-rideable lumps. The wind is often cross or cross-off, and sometimes strong at 19 mph, which keeps the surface clean but there’s just nothing to push a board. The combined swell energy is mostly in the single digits or low teens (weak energy), with a few days of zero energy. It’s a frustrating stretch of poor surf conditions.
The end of the second week, on Friday the 24th of July, things finally perk up. A swell of 4 ft starts to show from the WNW with a period of just 5 seconds. That’s short-period wind swell, so it won’t have the punch of a groundswell, but the combined energy jumps to 77 (moderate wave energy). The wind is light at 6 mph and cross-off, which means the surface will be clean. It’s surfable, but it’s very ordinary. The water temperature is about average for the time of year, nothing unusual to report there.
For a beginner spot that’s inconsistent, this is a long wait for very little. The setup is a beach, so with that short, weaker swell, it’s not going to be world-class. Honestly, if you’re a kiter, you might get a look on that Friday. For a surfer? The only recommendation I can make is that Friday the 24th of July morning is your window. Go in with low expectations, and you might score a few clean, small ones. Otherwise, it’s a blank run.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Fri morning, min 14°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Sat night. Warm (max 24°C on Tue afternoon, min 13°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | |||||||||||||||
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 11 | WNW 3 | — | N 3 | N 3 | N 5 | NW 6 | NW 5 | N 5 | NE 5 | NE 4 | NE 4 | NE 5 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | S 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 1 | 0 | 0 | 0 | 0 | 16 | 10 | 0 | 0 | 0 | 0 | 0 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 10 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | off | off | off | off | cross-off | off | cross-off | cross-off | off | off |
High Tide | 5:27AM4.83m | 6:12PM4.58m | 6:36AM4.79m | 7:23PM4.67m | 7:51AM4.85m | 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 | |||||||
Low Tide | 11:52AM1.51m | 00:24AM1.81m | 1:00PM1.53m | 1:36AM1.68m | 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 | ||||||||
 | |  |  | | |  | |  | | | | | |  | | | | | |  | |
 | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — |
 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 |
mm | — | — | — | — | — | — | — | — | 5 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 20 | 19 | 21 | 21 | 19 | 21 | 21 | 21 | 20 | 21 | 19 | 18 | 20 | 20 | 21 | 24 | 22 | 21 | 24 | 23 |
Feels °C | 15 | 19 | 17 | 19 | 19 | 16 | 20 | 18 | 17 | 16 | 16 | 12 | 10 | 14 | 13 | 17 | 20 | 15 | 18 | 21 | 17 |
Swell 1 Height (m) Direction Period (s) | SSW 3 | WNW 3 | — | — | — | — | NW 6 | NW 5 | N 5 | — | — | N 4 | — | S 19 | S 15 | S 18 | SW 18 | SW 14 | SE 4 | SW 16 | SW 13 |
| kJ | 1 | 1 | — | — | — | — | 16 | 10 | 19 | — | — | 9 | — | 7 | 4 | 6 | 12 | 7 | 1 | 10 | 7 |
Swell 2 Height (m) Direction Period (s) | S 11 | SW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 | SW 16 | — | S 16 |
| kJ | 3 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | 10 | — | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NE 5 | — | — | NE 5 | S 15 | — | — | — | — | S 13 | S 13 | SW 16 |
| kJ | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | 4 | — | — | — | — | 3 | 3 | 10 |
Wind waves Height (m) Direction Period (s) | WNW 3 | — | — | N 3 | N 3 | N 5 | NNW 6 | N 5 | ENE 5 | NE 5 | NE 4 | NE 4 | NE 5 | NE 4 | NE 4 | NE 5 | NE 4 | NE 5 | NE 4 | NE 4 | NE 5 |
| kJ | 2 | — | — | 1 | 5 | 57 | 67 | 48 | 15 | 18 | 24 | 19 | 18 | 38 | 20 | 14 | 28 | 25 | 16 | 21 | 30 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 241 | 234 | 184 | 179 | 179 | 189 | 184 | 249 | 249 | 287 | 208 | 305 | 410 | 313 | 249 | 184 | 163 | 287 | 288 | 333 | 292 |
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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