Trearddur Bay (Holy Island) Surf Forecast and Surf Report

Alright folks, Rusty here. Let’s have a look at what’s on offer for Trearddur Bay over the next couple of weeks.

Honestly, it’s a tough stretch. The outlook for Trearddur Bay (Holy Island) is pretty grim for the first nine days. We’ve got a run of poor surf conditions from Friday the 4th all the way through to the morning of Saturday the 13th of September. That’s a solid gap with nothing worth paddling out for. The wind is almost always cross-onshore or onshore, often strong, and the wave energy is weak to moderate at best, with combined energy figures mostly in the double digits or low triple digits (like 176, 139, 60). The swell is short period, around 4 to 7 seconds, so it’s weak and messy. The one standout window is a brief moment on the morning of Sunday the 13th of September.

Sunday, 13th September – The Best Bet
On Sunday morning, we finally get a bit of a break. The swell is 4 ft from the SW, with a period of 5 seconds, and the combined energy is a modest 68. The wind goes light, from the N at 6 mph, and it’s cross-offshore. That means clean conditions. It’s surfable, but very ordinary. Trearddur Bay is a beginner spot, inconsistent, and it’s fairly exposed to the SW swell direction, which matches the guidance’s optimum direction. The water temperature is about average for this time of year, nothing unusual. This is the only session that scrapes a recommendation, but it's not a classic. The afternoon on Sunday gets a bit bigger at 5 ft, but the wind turns cross-shore and the energy jumps to 134, making it a bit lumpy.

Monday, 14th September – Big But Not Good
Then Monday the 14th sees a spike in size – 8 ft from the SW, with a period of 7 seconds and combined energy of 539. That’s moderate-to-strong energy, but it’s all onshore wind from the SW, so it’s a washing machine. That size is too big for beginners and only okay for experts, but with onshore wind, it’s just a mess.

After that, the last few days of the outlook (15th to 19th September) drop right off. Tiny swell, 0.3 ft to 3 ft, and weak energy figures (1 to 24). The wind is a mix of cross-on, cross, or light, but the swell is too small to surf. The 17th and 18th are flat with just a ripple.

So, if you’re desperate, the morning of Sunday the 13th is your window. It’s clean, but the waves will be small and ordinary. Otherwise, it’s a long wait for something better. Forecasts can change, but right now, it’s a blank run for Trearddur Bay.

Rusty.

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