Trearddur Bay (Holy Island) Surf Forecast and Surf Report

Alright folks, Rusty here, and I’ve been staring at the charts for the next couple of weeks around Trearddur Bay (Holy Island). I’ll be straight with you—this is a tough one. The forecast is a long, dry spell with almost nothing to get excited about for the first eleven days. We’re looking at a whole lot of small, weak, and messy conditions, with a lot of onshore and cross-onshore wind. The water temp is sitting at 63°F, which is a touch warmer than normal for this time of year, but that’s about the only thing that’s slightly above average.

From Sunday the 30th of August right through to the 10th of September, it’s a total write-off. The surf is consistently poor, with small, weak swells and lumpy, choppy conditions. The combined energy is mostly in the low double-digits or low triple-digits at best, with the highest early on being 157 (weak to moderate) on Sunday morning, but it’s paired with a cross-on wind and a poor surf rating. The wind is often onshore, and the swell period is short, with a lot of 4 to 6-second stuff. Honestly, there’s nothing here for a surfer. It’s a grim stretch.

Then, on Thursday the 10th of September, something finally shows a pulse. The morning sees a modest 7ft swell from the SSW, with a period of 6 seconds, and the combined energy jumps to 329 (moderate). The wind is a light breeze from the southeast, crossing the swell, and conditions are described as marginal. But the real standout is Thursday afternoon. The wind drops to calm, becoming glassy, and the swell holds at 7ft from the SSW with 6-second period, and the energy reads 312 (moderate). The guidance says “expect good surf conditions.” This is our best window. It’s a short period swell, so it won’t have the grunt of a groundswell, but when it’s glassy and clean at Trearddur Bay, it can still be fun. The swell direction is SSW, which is close to the optimum SW direction for this spot, so it should wrap in reasonably well. Keep in mind the crowds are sometimes an issue here, so if you can get out that afternoon, you’ll have the best chance of a clean wave.

After that, things drop off again. Friday the 11th has a smaller 4ft SSW swell, but the wind swings to cross-off in the morning, which is clean, but the energy is only 124 (weak), so it’s small. The rest of the outlook fades away into tiny, weak waves with onshore wind, and by the 13th and 14th of September, we’re down to 0.3ft or 0.7ft swells. It’s a dead end.

So, to wrap it up: there’s a massive gap of no surf from now until the 10th of September. The only real standout is that Thursday afternoon glassy session with a 7ft SSW swell. It’s not a big, powerful swell, but it’s the only clean, rideable wave in the whole 16-day window. Get on it if you can.

Rusty.

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