Guethary - Les Alcyons/Avalanche Surf Forecast and Surf Report

Alright gang, Rusty here. Let's talk about what's happening down at Guethary for the next couple of weeks.

First up, the water's sitting at a warm 74°F, which is a good bit warmer than average for this time of year – a nice little treat.

The pattern is a slow start. We've got a few days of smaller, wind-affected waves before a proper pulse of long-period groundswell shows up late next week and into the weekend. The standout window is definitely Monday the 14th of September through to the weekend after.

For the first few days, it's pretty average. You've got small 3ft to 3ft waves but the wind is messy – onshore or cross-onshore, so it's hard to get excited. The energy is weak to moderate (226–309) and the forecast isn't getting you frothing. Wednesday the 9th sees a jump in size to 6ft from the NW, but that comes with a moderate breeze and a short 9 second period, so it'll be lumpy. The energy jumps up to 497 (moderate), but the quality isn't there. Give it a miss.

Now, the real highlight rolls in on Sunday the 13th of September. The swell builds to 5ft–5ft from the NW with a clean 13 second period – that's proper groundswell. That energy is now strong at 673–790. The wind is light but cross-onshore Sunday morning, but the waves have that push and shape. This is a reef set-up, so longer period swells like this will wrap in nicely, offering proper walls. It's an expert-only spot, and crowds are often an issue here, and for good reason.

But for my pick of the forecast? Monday morning the 14th of September. Glassy, clean conditions off an ENE breeze, and a solid 4ft NW swell with a 12 second period. The energy is strong (442) and the report says "expect good surf conditions". That's the session to circle. The swell is lined up from the optimum direction (W) and those offshore winds will have the reef folding perfectly. It's not too big for the experienced crew, but with a bit of size, it'll be a proper morning.

We've also got a shout for Wednesday morning the 16th of September. Similar story: glassy winds, 5ft NW groundswell at 11 seconds, and energy at 455. The morning will be clean before the sea breeze kicks in.

Then there's a late pulse. Friday the 18th of September morning sees more glassy conditions with a 5ft NW swell (10 seconds) and good energy (469). And Saturday the 19th of September morning also looks glassy with a 6ft NW swell, though the period drops to 8 seconds, making it a bit weaker and less organised. Still clean though.

The very last day, Monday the 21st of September, has a 5ft NW swell with a very long 13 second period and huge energy (870), but the wind is howling cross-onshore at 16 mph. That's a messy, blown-out one for sure.

So, in a nutshell: pass on the first week, lock in the morning sessions on the 14th and 16th of September, and keep an eye on the morning of the 19th. The long-range stuff for the 21st has promise but the wind needs to play ball. It's Guethary – it delivers when it wants to.

Rusty out.

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