Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 1 Aug 2026:
- Most powerful swell: Wednesday 5 Aug, 4AM (local time) - 5ft (1.5m), 6s period, SSW swell with 143 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 1.5m 6s and forecast to arrive on Wednesday (Aug 05) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Monday (Aug 03) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Wed 5th Aug) | 5ft (1.5m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, let’s talk Trearddur Bay (Holy Island). I’m callin’ it as it is – the next 16 days are a total write-off for surf. The finder’s got no good options anywhere, so we’re lookin’ at a proper dry spell. For a spot like this, a blank run like this happens, so don’t be too gutted; it’s just how it goes sometimes.
Water temp’s around 62°, which is about normal for this time of year, so no surprises there.
Walkin’ through the days: from August 1st all the way to the 16th, every single session is rated poor. Swell heights are tiny – from 0.3 ft up to about 4 ft at best, but the wind’s the killer. Most of the time it’s cross-onshore or onshore, messin’ up what little wave there is. A few mornings on the 2nd and 3rd look clean with some light offshore breezes, but the swell is barely a ripple – 0.3 ft to 0.7 ft – so it’s totally flat.
The closest we get to any action is Wednesday the 5th morning, with a 4 ft swell from the SSW, but it’s sloppy with a cross-onshore wind and a short period of 6 seconds. The energy is moderate (118), but it’s just messy. Then on the 6th, a 4 ft NW swell with a fresh cross-shore wind – again, lumpy. Not worth paddlin’ out for.
Later on, the 10th and the 15th have cleaner conditions with cross-off winds and a bit more push (4 ft), but the swell is short-period and weak in energy (72 and 65). Even the 16th afternoon has a clean offshore wind and a 3 ft swell, but it’s a 4-second wind bump – no power.
So, no standout here. Not a single session I’d bother with. If you’re really keen, the cleanest windows are on the 2nd and 3rd August mornings, but you’ll be paddlin’ over nothin’. The 15th and 16th have a bit more size and clean wind, but the swell direction’s off and the period is short. For a beginner, any of the 3 ft+ days might be okay for a splash, but nobody’s gettin’ a proper wave.
Keep an eye on the charts, but for now, leave the board at home. It’s a long, flat stretch.
Rusty.
Short Range ForecastSome drizzle, heaviest during Mon night. Warm (max 21°C on Mon afternoon, min 13°C on Sat morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Tue morning, min 13°C on Wed night). Winds decreasing (fresh winds from the WNW on Wed night, light winds from the WNW by Thu night). | ||||||||||||||||||||
Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | |||||||||||||||
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) | W 4 | SW 5 | SW 4 | SSW 4 | W 9 | W 10 | SW 9 | WSW 8 | SW 8 | SW 8 | SSW 5 | SSW 5 | SSW 6 | SSW 7 | SSW 7 | NW 5 | NW 5 | SW 4 | WNW 4 | SW 5 | SW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 11 | 3 | 5 | 1 | 2 | 3 | 3 | 7 | 11 | 10 | 30 | 64 | 118 | 96 | 93 | 76 | 38 | 9 | 8 | 4 | 5 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-off | off | off | cross-off | off | cross-off | cross-on | cross-on | cross-on | cross-on | on | cross | cross | cross-on | on | cross-on | on | cross-on |
High Tide | 12:58PM5.13m | 1:09AM5.52m | 1:32PM5.12m | 1:43AM5.48m | 2:07PM5.09m | 2:20AM5.40m | 2:46PM5.01m | 3:02AM5.25m | 3:31PM4.87m | 3:52AM5.04m | 4:26PM4.70m | 4:55AM4.80m | 5:37PM4.56m | ||||||||
Low Tide | 6:56PM1.12m | 7:20AM0.89m | 7:31PM1.14m | 7:56AM0.93m | 8:09PM1.21m | 8:35AM1.03m | 8:51PM1.35m | 9:20AM1.21m | 9:40PM1.55m | 10:13AM1.46m | 10:41PM1.77m | 11:18AM1.72m | 11:58PM1.91m | ||||||||
 |  |  |  | |  | | |  | | |  | | | | | | | | | | |
 | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — |
 | — | — | 9:14 | — | — | 9:12 | — | — | 9:10 | — | — | 9:08 | — | — | 9:07 | — | — | 9:05 | — | — | 9:02 |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 15 | 15 | 16 | 16 | 16 | 19 | 21 | 17 | 19 | 19 | 17 | 16 | 18 | 15 | 14 | 15 | 16 | 14 | 16 | 16 |
Feels °C | 11 | 12 | 12 | 14 | 13 | 12 | 17 | 20 | 13 | 16 | 16 | 13 | 14 | 15 | 8 | 9 | 11 | 13 | 12 | 12 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 5 | NW 4 | SW 4 | SSW 4 | — | SW 8 | NE 5 | NE 4 | NNE 4 | SW 8 | SW 8 | — | — | S 13 | SSW 7 | SW 7 | NW 5 | SW 4 | SW 5 | WNW 3 | SW 5 |
| kJ | 8 | 2 | 5 | 1 | — | 3 | 7 | 3 | 3 | 10 | 2 | — | — | 3 | 93 | 35 | 38 | 9 | 7 | 1 | 1 |
Swell 2 Height (m) Direction Period (s) | — | W 9 | — | — | W 9 | W 10 | SW 9 | WSW 8 | SW 8 | NNE 4 | — | — | — | — | S 13 | — | SW 6 | NNW 6 | SW 12 | SW 5 | SW 12 |
| kJ | — | 2 | — | — | 2 | 2 | 3 | 7 | 11 | 2 | — | — | — | — | 3 | — | 10 | 6 | 6 | 4 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 12 | SSW 6 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 3 | — | — | — |
Wind waves Height (m) Direction Period (s) | W 4 | SW 5 | — | — | — | NNE 3 | — | — | — | SSE 3 | SSW 5 | SSW 5 | SSW 6 | SSW 7 | WNW 4 | NW 5 | WSW 6 | — | WNW 4 | — | — |
| kJ | 11 | 3 | — | — | — | 6 | — | — | — | 1 | 30 | 64 | 118 | 96 | 22 | 76 | 25 | — | 8 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 357 | 368 | 246 | 246 | 249 | 182 | 184 | 192 | 179 | 284 | 284 | 219 | 51 | 284 | 179 | 187 | 51 | 195 | 280 | 283 | 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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