Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 26 Jul 2026:
- Best quality surf: Monday 27 Jul, 11PM (local time) - 5ft (1.5m), 10s period, NW swell with glassy winds.
- Most powerful swell: Monday 27 Jul, 2PM (local time) - 5ft (1.6m), 10s period, NW swell with 498 kJ wave energy.
- Next surfable swell (1★+): Monday 27 Jul, 11PM (local time) - 5ft (1.5m), 10s period with NW swell.
Best Forecast Surf Conditions for Guethary - Les Alcyons/Avalanche this week:
The surf forecast for Guethary - Les Alcyons/Avalanche over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Jul 27) at 11PM. The primary swell is predicted to be 1.5m and 10s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Guethary - Les Alcyons/Avalanche in the next 16 days are 1.6m 10s and forecast to arrive on Monday (Jul 27) at 2PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Mon 27th Jul) | 5ft (1.5m) 10s |
| Best Surf | 11PM (Mon 27th Jul) | 5ft (1.5m) 10s |
| Most Powerful | 2PM (Mon 27th Jul) | 5ft (1.6m) 10s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
The Lowdown
Alright crew, Rusty here, giving you the lowdown on the surf for Guethary.
To be honest, it’s looking pretty bleak for the next couple of weeks. From Monday the 27th of July all the way through to Tuesday the 11th of August, the surf is mostly a no-go. We’ve got a few little moments but nothing that’s going to have you scrambling for your board. Expect a long stretch of small, weak, and generally disappointing surf.
The break we’re looking at is Guethary - Les Alcyons/Avalanche, a proper expert reef break that demands the right conditions. Right now, it’s not getting them. Monday the 27th starts off with a light cross-onshore and a weak, short-period NW swell around 4ft. The energy is weak, and the afternoon is even worse with the swell bumping up to 5ft but the wind turning more onshore, making a mess of things. Not the one.
Tuesday the 28th of July is your best – and really only – bet. The morning is looking glassy with a consistent 4ft NW swell. The wind is offshore from the ESE at just 3 mph, so it should be clean. The swell period is a decent 10 seconds, so there'll be a bit of shape to it. It’s not going to be mind-blowing, but for clean conditions, it’s the best we’ve got.
From Wednesday the 29th of July onwards, it’s a long, sad story. The swell drops right off, with heights between 1ft and 4ft, short periods, and mostly onshore or cross-onshore wind. The energy readings are all low. There are a few glassy mornings in early August, like the 4th and the 7th, but the swell is tiny at 1ft, with next to no power. You’d be out there chasing ripples.
On Tuesday the 11th of August morning, we finally see a glassy window with a 4ft swell from the NNW, but the period is a short 7 seconds and the energy is weak. It’s surfable, but very ordinary.
So there you have it. One clean-ish morning on the 28th of July, and then a whole lot of flatness. It’s a quiet spell for the area, but forecasts can change. Hang in there. Rusty out.
Short Range ForecastLight rain (total 2mm), mostly falling on Mon morning. Warm (max 37°C on Tue night, min 17°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Thu afternoon, min 18°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | NW 7 | NW 8 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 124 | 183 | 459 | 425 | 362 | 284 | 241 | 166 | 135 | 93 | 57 | 84 | 57 | 33 | 33 | 82 | 115 | 132 | 107 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | off | glassy | cross | cross-on | on | on | cross-on | on | cross-on | on | on | on | glassy | on | cross | cross-on |
High Tide | 4:10AM2.97m | 4:26PM3.21m | 4:49AM3.12m | 5:03PM3.39m | 5:24AM3.26m | 5:37PM3.54m | 5:57AM3.36m | 6:10PM3.65m | 6:29AM3.42m | 6:42PM3.71m | 7:01AM3.45m | 7:14PM3.71m | |||||||
Low Tide | 9:48PM0.94m | 10:02AM0.93m | 10:31PM0.76m | 10:42AM0.75m | 11:09PM0.59m | 11:19AM0.59m | 11:45PM0.45m | 11:53AM0.47m | 00:19AM0.35m | 12:26PM0.39m | 00:52AM0.31m | 12:59PM0.37m | 1:25AM0.31m | ||||||
 |  |  |  | | | | | |  | | | | |  | | | | | |
 | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — |
 | 9:36 | — | — | 9:35 | — | — | 9:34 | — | — | 9:31 | — | — | 9:30 | — | — | 9:30 | — | — | 9:29 |
mm | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 20 | 21 | 21 | 26 | 36 | 37 | 24 | 26 | 22 | 22 | 24 | 21 | 21 | 22 | 21 | 21 | 23 | 22 |
Feels °C | 20 | 21 | 22 | 21 | 27 | 34 | 35 | 25 | 27 | 22 | 24 | 25 | 21 | 22 | 23 | 22 | 22 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | NW 7 | NW 8 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 |
| kJ | 124 | 183 | 459 | 425 | 362 | 284 | 241 | 166 | 135 | 93 | 57 | 84 | 57 | 33 | 33 | 82 | 115 | 132 | 107 |
Swell 2 Height (m) Direction Period (s) | NW 12 | NW 11 | — | — | — | — | — | — | — | — | WNW 5 | — | NNW 4 | NNW 5 | NNW 5 | NW 9 | W 11 | W 11 | W 10 |
| kJ | 35 | 169 | — | — | — | — | — | — | — | — | 15 | — | 13 | 14 | 10 | 13 | 3 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | WNW 4 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 14 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 12 | 31 | 87 | 0 | 0 | 6 | 12 | 4 | 12 | 47 | 43 | 87 | 350 | 84 | 197 | 1 | 17 | 6 | 13 |
Best forecast wave conditions in La Cote Basque | |||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||
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Information about the Guethary - Les Alcyons/Avalanche Surf forecast
The above surf forecast table for Guethary - Les Alcyons/Avalanche provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Guethary - Les Alcyons/Avalanche can be found by selecting the local surf guide option on the grey menu. Our Guethary - Les Alcyons/Avalanche surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Guethary - Les Alcyons/Avalanche) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Guethary - Les Alcyons/Avalanche may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Guethary - Les Alcyons/Avalanche is 9 km (6 miles) from Biarritz. If you plan a holiday in La Cote Basque, look for hotels and other accommodation in Biarritz. Biarritz has rooms for a wide range of budgets as well as car hire and transport links.
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