Trearddur Bay (Holy Island) Surf Forecast and Surf Report

Hey folks, Rusty here. Let’s be straight with this one – Trearddur Bay (Holy Island) is looking at a grim run for the next 16 days. There is no surf worthy of a paddle-out until around the 9th of September, and even that is a huge question mark. We’re talking well over a week of flat or junk swell and messy wind. Let’s get into the details.

The water temp is sitting at 63°F, which is about a touch warmer than normal for the time of year, so you won’t need the thickest rubber if you do get out.

From Tuesday the 25th of August, through to the end of the month and into the first week of September, it’s a write-off. Swell heights mostly below 2 ft, with period windswell under 8 seconds, and wind is either cross-off, cross-on, or howling onshore. The combined wave energy is weak, often well under 100 (10–73 range). For a place that’s “fairly exposed” to SW swell, this is a real drought. The only positive is that a few morning windows show clean conditions, but there’s simply no push.

The 1st of September shows a spike – 10 ft swell, but it’s short-period (8 seconds), combined energy 1334, and wind is screaming onshore or cross-onshore at 18–25 mph. For an exposed beach break setup like this, that’s not surf – that's a washing machine for experts only, and even then the wind will destroy any shape. Kite surfers might find some fun, but paddle surfing? Forget it.

Moving into the 5th of September, we get some size again (6 ft, 8-second period, combined energy 435), but the wind is still fresh cross-onshore, so quality stays low. The 7th of September is the one small glimmer: on the Monday morning, we have 6 ft SW swell with a 6-second period, and a solid cross-off wind from the N at 18 mph. That wind direction is actually offshore here. Combined energy is 188 – moderate. It’ll be clean, but the period is short, so waves will be soft and lumpy. Not a standout, just the best of a bad lot.

Then the 8th and 9th of September roll in. The 8th Tuesday afternoon sees another 10 ft pulse (8 seconds, combined energy 988), but again with strong cross-onshore winds. Wednesday the 9th morning is the only day the guidance even gives a marginal nod. Swell height 8 ft, period 8 seconds, combined energy 908, but the wind is a gentle cross-onshore from the west. That’s too big for beginners, big for intermediates, and on a beach break with 8-second period and cross-onshore wind – it's lumpy and challenging.

Bottom line: There is no standout session in this 16-day window. Trearddur Bay is inconsistent and the conditions just refuse to line up. The one potential window is the morning of the 7th of September for cleaner, smaller waves, or very early on the 9th if you're desperate and expert. Otherwise, the forecast is a write-off for quality surf. It’s the kind of run that doesn’t happen often here, but when it does, you just have to wait for the next system to shift.

Stay patient. Rusty.

Read more