Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 11 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 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 | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Alright, Rusty here, and I’m looking at a real dry spell for Trearddur Bay (Holy Island) for the next couple of weeks.
We’ve got a long, long gap with zero surf. Starting Saturday, July 11th, and carrying through to the evening of Thursday, July 23rd, there’s just nothing. The swell windows are bone dry, and we’re stuck seeing "poor surf conditions" over and over. It’s a tough one.
The water temperature is sitting around 60°F, which is about a degree and a half warmer than we’d normally see for July.
Even when a tiny 0.3 ft swell shows up on Monday the 13th from the southeast with a 4-second period, it’s just wind slop. The combined energy is a measly 1 – essentially nothing. The wind stays offshore or cross-off for a lot of that first week, which is a real shame: clean wind, but no wave to use it on.
Finally, on the afternoon of Friday, July 24th, we get something. A 5 ft swell from the south-southwest at 5 seconds, with offshore wind from the north-northeast at 12 mph. The combined energy hits 104 (moderate wave energy). The call is "surfable waves but very ordinary conditions," so we’re talking a small, messy wave that a beginner could mess around on. It’s the best we’ve got.
The next day, Saturday the 25th, sees a bigger 8 ft swell from the west with a 6-second period and a strong energy at 461. That’s serious water, but the wind is a cross-onshore mess: 6 mph from the west-southwest in the morning, turning into a strong 19 mph from the south-southwest in the afternoon. It’ll be lumpy and blown out. That one’s only for the experts, and honestly, with those conditions, it looks better for the kite crew than the paddle-in guys.
So your only real chances are that small, clean-ish Friday afternoon for beginners, and the big, wild Saturday for experienced surfers only. Other than that, the month is a washout.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Sat afternoon, min 14°C on Sun night). Winds increasing (light winds from the N on Sat morning, fresh winds from the ENE by Mon night). | Days 4-6 Weather SummaryHeavy rain (total 29mm), heaviest during Wed night. Warm (max 23°C on Tue afternoon, min 16°C on Tue morning). Winds decreasing (strong winds from the NE on Tue afternoon, calm by Thu morning). | ||||||||||||||||||||
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 | N 5 | NE 5 | NE 4 | NE 5 | SE 4 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | S 16 | SW 14 | SW 14 | SSW 6 | SSW 6 | SSW 6 | SSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 7 | 8 | 8 | 3 | 4 | 6 | 6 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | off | off | off | off | off | off | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-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 | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 12 | 1 | 2 | 11 | — | — | — |
Temp °C | 22 | 23 | 22 | 22 | 23 | 22 | 19 | 21 | 19 | 21 | 23 | 23 | 23 | 23 | 20 | 21 | 23 | 21 | 19 | 20 | 19 |
Feels °C | 21 | 21 | 18 | 19 | 18 | 17 | 12 | 15 | 12 | 17 | 18 | 18 | 21 | 20 | 17 | 22 | 23 | 21 | 17 | 18 | 17 |
Swell 1 Height (m) Direction Period (s) | — | — | N 5 | — | — | N 6 | — | S 19 | S 15 | S 18 | SW 18 | S 7 | SW 6 | SSW 7 | SSW 7 | NNE 4 | NNE 4 | SSW 6 | SSW 6 | SSW 6 | SSW 6 |
| kJ | — | — | 22 | — | — | 1 | — | 7 | 4 | 6 | 12 | 1 | 1 | 5 | 5 | 8 | 6 | 3 | 4 | 4 | 3 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SE 4 | — | — | — | S 8 | SW 14 | SW 16 | SW 16 | SW 13 | SSW 6 | SSW 6 | NE 4 | — | SW 12 | SW 12 |
| kJ | — | — | — | — | — | — | 1 | — | — | — | 1 | 7 | 10 | 10 | 7 | 4 | 4 | 1 | — | 6 | 6 |
Swell 3 Height (m) Direction Period (s) | — | — | — | NE 5 | — | — | — | S 15 | — | S 14 | — | — | S 13 | S 13 | S 16 | SW 14 | SW 14 | — | — | — | — |
| kJ | — | — | — | 1 | — | — | — | 4 | — | 4 | — | — | 3 | 3 | 5 | 8 | 8 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 5 | N 5 | — | NE 5 | NE 4 | NE 5 | NE 4 | NE 5 | NE 4 | NE 4 | NNE 4 | NE 5 | NE 5 | NNE 4 | NNE 5 | — | — | — | — | — | NNW 3 |
| kJ | 25 | 22 | — | 21 | 34 | 40 | 45 | 49 | 19 | 26 | 32 | 37 | 21 | 16 | 28 | — | — | — | — | — | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 267 | 260 | 249 | 287 | 208 | 305 | 410 | 364 | 286 | 184 | 163 | 288 | 208 | 208 | 326 | 326 | 418 | 305 | 308 | 589 | 316 |
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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