Trearddur Bay (Holy Island) Surf Forecast and Surf Report

Right then, let’s have a look at what’s on offer for Trearddur Bay (Holy Island). I’ll be straight with you – it’s a quiet stretch ahead. The water’s sitting at 63°, which is a touch warmer than usual for this time of year, so that’s a nice little bonus if you’re having a paddle anyway.

The whole 16-day window is pretty much a blank run for Trearddur Bay. There’s a big gap right from the start with no real surf on the cards. The first few days are tiny, with weak, onshore wind and poor conditions. The combined swell energy is barely registering, with values like 4 (Tuesday morning), 2 (Tuesday afternoon), and 17 (Wednesday morning) – all very weak. We’re talking ankle-snappers at best.

Things stay flat and messy through the rest of the first week. A little pulse of energy shows up on Friday morning, 14 August, with a 3 ft swell from the WNW, but the period is a short 4 seconds, so it’s weak and choppy. The combined energy is only 33, which is still weak. The wind is cross-offshore from the NNW at 12 mph, so it’s clean, but there’s just no power.

We get a brief moment on Monday afternoon, 17 August, where the swell bumps up to 4 ft from the SSW, with a period of 5 seconds. The combined energy reaches 80 – still weak, but the best we’ll see. The cross-shore wind from the SSE at 6 mph gives a light chop. It’s not great, but it’s the most rideable wave of the entire stretch.

The second week stays poor. On Wednesday, 19 August, there’s a 5 ft to 6 ft swell from the WSW, with period around 5–6 seconds, and combined energy climbing to 113 then 185. That’s moderate energy, but the wind is cross-on or onshore, making it messy. The 6 ft swell is a bit too much for beginners, especially with the short period and onshore wind. The setup looks more interesting for kite surfing than paddle surfing, if you’re into that.

After that, it drops off again. The rest of the month is flat or blown out, with strong winds and tiny swell. Thursday morning, 20 August, is clean but only 1 ft. The last real chance is Saturday morning, 22 August, with a 4 ft swell from the NW, period 5 seconds, and combined energy of 85, but the wind is onshore from the SW at 9 mph, making it messy.

Honestly, there’s no standout session here. The best bet is Monday afternoon, 17 August, with that 4 ft SSW swell and light cross-shore wind. It’s not much, but it’s the only window where you might get a few knee-high runners. Keep your expectations low and your board ready – forecasts can change, but this one’s a tough read.

Rusty

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