Guethary - Les Alcyons/Avalanche Surf Forecast and Surf Report

Alright folks, Rusty here. Let's have a look at what’s on the cards for this stretch of coast. There’s only one spot in the mix for the whole 16-day window, and it’s a proper expert-only reef setup. So if you’re not on a shortboard and comfortable in heavy water, it might be one to watch from the cliff.

We’ve got a blank start. The first wave worth paddling out for isn’t until Sunday, September 13th. Before that, Saturday is a total write-off – tiny, weak, and messy. So you’ve got a day of waiting.

Alright, Sunday morning the 13th is where it kicks off. Guethary – Les Alcyons/Avalanche is going to be a standout. We’re looking at a clean 4ft groundswell out of the NW, with a period of 13 seconds – that’s proper long-period energy. The wind is dead calm, glassy as a mirror. The combined energy is a solid 545 – that’s moderate energy, but with that period it’ll feel punchy. This is a reef break, so that long period will line up beautifully and give you nice, bowling walls. Keep in mind, though, it’s an expert wave and crowds are often here, so expect some company on the peak. Water temp is about average for the time of year – nothing unusual.

Monday the 14th keeps the good times rolling in the morning – another glassy session with 4ft NW swell at 11 seconds and energy at 453. Nice and clean again. Tuesday and Wednesday drop off fast – the swell gets smaller and the wind turns onshore or cross-on and choppy. Thursday, September 17th morning is another real highlight. We’re up to 6ft NW, 12-second period, and glassy conditions. The energy jumps to 765 – getting into moderate-strong territory. That’s a serious morning for anyone with the skills to handle it.

Friday the 18th morning is also clean with 4ft. Then Saturday, September 19th morning is another banger: 6ft, 12 seconds, glassy, and energy at 760. That’s a weekend morning to circle.

Sunday the 20th morning is still clean at 4ft, but the afternoons get a bit bumpy. The pattern holds with clean mornings and grovelly afternoons through to Wednesday, September 23rd, where we get another standout morning: 5ft, 12 seconds, glassy, and energy at 583. Real clean.

Now, the big one. Friday, September 25th morning is the beast of the forecast. 8ft of NW groundswell with a 14-second period and combined energy of 2263 – that’s very strong. Glassy conditions again, offshore breeze. This is expert-only territory – way too big for anyone without serious experience. That’s the best looking day on the board, but it’s over a week away, so keep an eye on it.

After that, Saturday the 26th morning remains solid with 6ft and clean conditions. We finish on Sunday, September 27th morning with a lovely 3ft, 15-second groundswell and light offshore wind – clean as a whistle, though the energy dips to 488.

Overall, there are a lot of good mornings here, with Sunday the 13th, Thursday the 17th, Saturday the 19th, and Friday the 25th being the true standouts. Just remember, this spot is for experts, it’s often crowded, and it’s a reef. Pick your peaks wisely.

Rusty.

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