Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 2 Aug 2026:
- Best quality surf: Friday 7 Aug, 8AM (local time) - 3ft (0.9m), 8s period, NW swell with glassy winds.
- Most powerful swell: Thursday 6 Aug, 8PM (local time) - 3ft (0.9m), 9s period, NW swell with 129 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 8AM (local time) - 3ft (0.9m), 8s 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 Friday (Aug 07) at 8AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.2m and 10s. 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 0.9m 9s and forecast to arrive on Thursday (Aug 06) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Fri 7th Aug) | 3ft (0.9m) 8s |
| Best Surf | 8AM (Fri 7th Aug) | 3ft (0.9m) 8s |
| Most Powerful | 8PM (Thu 6th Aug) | 3ft (0.9m) 9s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
The Lowdown
G’day, Rusty here, and I’ve got the outlook for Guethary - Les Alcyons/Avalanche. This is a reef break, and it’s an expert-only setup, so this isn’t one for the learners. The water temp is about average for this time of year, nothing unusual to report there.
Right now, we’re starting off with a bit of a flat spell. The first chance at anything surfable is Friday morning, August 7th, and even then, it’s only just surfable, but very ordinary. The swell is a tiny 3 ft from the NW, period of 8 seconds, and the combined wave energy is weak (117). The wind is glassy in the morning, which is a massive plus, but the waves themselves are just poor. Honestly, the whole 16-day window looks pretty grim. After that Friday morning, the rest of the days just keep serving up poor surf conditions, with tiny swell and inconsistent energy.
The best of a bad bunch is that Friday morning, August 7th. It’s not a standout by any stretch, but it’s the only window where the conditions are even close to being rideable. The swell is 3 ft from the NW, period 8 seconds, and that glassy wind will make the surface clean. But the energy is weak, and the waves are just ordinary. For a break that’s exposed and needs a W swell, this is a tough run.
There are then long gaps of nothing. From that Friday, it’s back to poor surf, with tiny waves and onshore winds or cross-onshore winds for the rest of the outlook. The swell never gets above 5 ft, and that’s on Monday, August 17th, but the wind is cross-onshore, and the surf is still listed as poor. The combined energy climbs to 318 (moderate) on that day, but it’s a no-go for quality.
For a reef that needs a good W swell, this is a quiet period. If you’re a kite surfer, the beach-and-reef setup with the consistent onshore winds might be more interesting, but for paddle surfing, it’s a write-off. The breaks are rarely worth paddling out for, and the forecast can always change, but right now, I’d leave the board at home.
Rusty.
Short Range ForecastSome drizzle, heaviest during Mon afternoon. Warm (max 23°C on Sun afternoon, min 18°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Wed night. Warm (max 23°C on Wed afternoon, min 18°C on Fri morning). Wind will be generally light. | ||||||||||||||||||
Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | ||||||||||||||
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) | NNW 6 | NNW 6 | NNW 6 | NW 6 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | W 9 | W 9 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 26 | 29 | 25 | 34 | 19 | 18 | 17 | 27 | 39 | 39 | 23 | 26 | 64 | 84 | 120 | 112 | 98 | 95 | 54 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | on | cross-on | cross-on | cross-on | cross-off | glassy | on | cross-on | glassy | on | cross-on | cross | cross-on | cross-on | glassy | on | cross |
High Tide | 7:33AM3.44m | 7:47PM3.66m | 8:08AM3.39m | 8:23PM3.55m | 8:46AM3.30m | 9:03PM3.40m | 9:30AM3.18m | 9:53PM3.21m | 10:24AM3.04m | 10:56PM3.03m | 11:36AM2.95m | 00:20AM2.92m | |||||||
Low Tide | 1:25AM0.31m | 1:33PM0.40m | 1:59AM0.36m | 2:09PM0.48m | 2:36AM0.46m | 2:49PM0.60m | 3:18AM0.62m | 3:37PM0.76m | 4:09AM0.80m | 4:37PM0.91m | 5:14AM0.97m | 5:53PM1.00m | |||||||
 | | |  |  |  | |  | | | | |  | | |  | | | | |
 | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — | 7:01 | — | — |
 | 9:29 | — | — | 9:28 | — | — | 9:27 | — | — | 9:24 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 |
mm | — | — | — | — | — | 1 | — | — | — | — | — | — | 8 | 1 | — | — | — | — | — |
Temp °C | 21 | 22 | 23 | 22 | 21 | 22 | 22 | 21 | 23 | 22 | 22 | 23 | 22 | 20 | 21 | 20 | 20 | 21 | 20 |
Feels °C | 21 | 23 | 22 | 21 | 22 | 23 | 24 | 23 | 23 | 22 | 24 | 24 | 24 | 21 | 22 | 19 | 20 | 20 | 19 |
Swell 1 Height (m) Direction Period (s) | NNW 6 | NNW 6 | NNW 6 | NW 6 | NW 4 | NW 4 | WNW 9 | WNW 9 | W 9 | W 9 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 |
| kJ | 26 | 29 | 25 | 34 | 12 | 6 | 17 | 27 | 39 | 39 | 23 | 26 | 64 | 84 | 120 | 112 | 98 | 95 | 54 |
Swell 2 Height (m) Direction Period (s) | WNW 9 | WNW 9 | NW 7 | WNW 10 | WNW 10 | WNW 10 | NW 4 | NNW 5 | NW 7 | NNW 3 | N 4 | WNW 11 | NNW 4 | N 4 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 |
| kJ | 16 | 16 | 7 | 11 | 19 | 18 | 3 | 2 | 2 | 2 | 1 | 12 | 5 | 3 | 10 | 10 | 19 | 9 | 8 |
Swell 3 Height (m) Direction Period (s) | NW 8 | NNW 8 | WNW 9 | — | NW 7 | NW 7 | NW 7 | NNW 7 | — | NW 7 | N 7 | — | — | NW 11 | — | — | — | — | — |
| kJ | 9 | 6 | 8 | — | 7 | 7 | 8 | 5 | — | 2 | 1 | — | — | 5 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NNW 4 | — | — | NNW 4 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 2 | — | — | 2 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 17 | 1 | 583 | 43 | 347 | 347 | 54 | 21 | 534 | 325 | 325 | 197 | 6 | 1 | 110 | 87 | 0 | 87 | 17 |
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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