Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 7 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 1PM (local time) - 0.5ft (0.1m), 18s period, SW swell with 12 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 0.1m 18s and forecast to arrive on Tuesday (Jul 14) at 1PM. 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 | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Right folks, Rusty here. Let's be straight with you, it's a tough stretch ahead for Trearddur Bay on Holy Island. The next couple of weeks are looking pretty quiet.
Looking at the whole 16-day window, there's nothing that's going to get the heart racing. We've got a long, quiet period stretching from now through to late July. There's a real lack of energy in the water, with swell heights barely registering. For the first few days, the water temp is sitting around 60°, which is about normal for the time of year, so no surprises there.
The first real chance of something rideable doesn't show up until Saturday morning, July 18th. Trearddur Bay will see a tiny 1ft swell from the SW, with a short period of 7 seconds. That's weak energy (11 in the total). The wind will be a cross-off from the N at 9 mph, which might keep it clean, but it's going to be small and weak. After that, it gets messy again. Sunday the 19th gets choppy with cross-onshore winds and Monday the 20th is blown out with fresh winds.
Honestly, the only other swell of note pops up right at the end of the period on Wednesday, July 22nd, over a week away, so take this with a pinch of salt. Swell could bump up to 3ft from the WNW and then SW, but it's coming with a short 4-second period and strong cross-onshore winds (fresh breeze at 19-22 mph). That combo will make for lumpy, messy conditions. The energy is still only moderate at best (36 to 39).
For a spot that's fairly exposed to the SW, which is a decent direction for it, the complete lack of any decent period or power kills it. There's no standout here, no day to circle on the calendar. The setup, with those winds and small, weak swell, might be more interesting for a kite session than a paddle. It's just one of those blank runs for the area.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Fri morning, min 16°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Sat morning, min 16°C on Sat night). Winds increasing (light winds from the NE on Sat morning, fresh winds from the ENE by Sun night). | ||||||||||||||||||||
Tue 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | NW 4 | S 12 | — | — | — | S 11 | NW 3 | — | — | N 3 | NNW 5 | NNW 6 | NNW 5 | N 5 | NE 5 | NE 4 | NE 4 | NE 4 | S 19 | S 15 | S 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4 | 3 | 0 | 0 | 0 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 4 | 6 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross-on | cross | cross-off | off | off | cross-off | cross-off | off | off | cross-off | off | off | cross-off | off | off | cross-off | cross-off |
High Tide | 4:10PM4.65m | 4:27AM4.93m | 5:07PM4.59m | 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 | |||||||
Low Tide | 10:15PM1.72m | 10:50AM1.43m | 11:15PM1.80m | 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 | ||||||||
 |  | | | | | | | | | | | | |  | | | | | | | |
 | — | — | 5:00 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 |
 | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | 9:39 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 19 | 19 | 20 | 19 | 18 | 20 | 20 | 21 | 22 | 21 | 24 | 24 | 23 | 20 | 22 | 22 | 21 | 21 | 23 | 22 |
Feels °C | 15 | 16 | 19 | 20 | 18 | 17 | 20 | 19 | 19 | 20 | 20 | 24 | 21 | 18 | 15 | 17 | 16 | 15 | 14 | 16 | 20 |
Swell 1 Height (m) Direction Period (s) | NW 4 | S 12 | — | — | — | S 11 | WNW 3 | — | — | — | — | NNW 6 | NNW 5 | N 5 | — | — | — | — | S 19 | S 15 | S 18 |
| kJ | 4 | 3 | — | — | — | 3 | 1 | — | — | — | — | 50 | 19 | 11 | — | — | — | — | 7 | 4 | 6 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | S 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | N 5 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 3 | SSW 3 | — | — | — | WNW 3 | NW 3 | — | — | N 3 | NNW 5 | — | NE 4 | ENE 5 | NE 5 | NE 4 | NE 4 | NE 4 | NE 4 | NE 4 | NE 5 |
| kJ | 2 | 1 | — | — | — | 2 | 2 | — | — | 5 | 42 | — | 3 | 8 | 13 | 20 | 16 | 10 | 23 | 16 | 11 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 235 | 267 | 246 | 288 | 246 | 184 | 234 | 241 | 182 | 267 | 249 | 249 | 260 | 275 | 288 | 208 | 305 | 415 | 285 | 246 | 249 |
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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