Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 3 Aug 2026:
- Best quality surf: Thursday 6 Aug, 8AM (local time) - 3.5ft (1.1m), 9s period, NW swell with cross-offshore winds.
- Most powerful swell: Thursday 6 Aug, 5AM (local time) - 3.5ft (1.1m), 9s period, NW swell with 183 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 8AM (local time) - 3.5ft (1.1m), 9s 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 Thursday (Aug 06) at 8AM. The primary swell is predicted to be 1.1m and 9s period with a secondary swell of 0.1m and 11s. Another secondary swell of 0.3m and 4s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Guethary - Les Alcyons/Avalanche in the next 16 days are 1.1m 9s and forecast to arrive on Thursday (Aug 06) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Thu 6th Aug) | 3.5ft (1.1m) 9s |
| Best Surf | 8AM (Thu 6th Aug) | 3.5ft (1.1m) 9s |
| Most Powerful | 5AM (Thu 6th Aug) | 3.5ft (1.1m) 9s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
The Lowdown
Hey folks, Rusty here. Gotta be straight with you – this 16-day window for Guethary - Les Alcyons/Avalanche is a real tough one. We're looking at a long stretch of tiny, weak swell and mostly poor conditions. The water temp is sitting at 77°F, which is much warmer than normal for this time of year, so at least you won't need a thick wetsuit.
The first real chance of anything surfable doesn't show up until the morning of Thursday, August 6th. Even then, it's ordinary. We've got a 4ft swell from the NW with a 9-second period, and the combined wave energy is only moderate (187). The wind is light cross-off from the NE, which cleans things up a bit. It's surfable, but don't expect any fireworks.
Friday morning, August 7th, offers a similar story. The swell drops to 3ft from the NNW (8 seconds, 126 energy), but the wind goes glassy from the WNW. That's the best wind we'll see, but the waves are still just ordinary.
After that, it's back to poor surf conditions for the next week. The swell stays small, generally under 3ft, and the wind is often onshore or cross-onshore. The morning of Friday, August 14th, sees a slight bump – a 5ft NNW swell (7 seconds, 186 energy) with glassy conditions from the NW. It's the biggest swell of the forecast, but still just "surfable waves but very ordinary conditions". The period is short, so it'll be a bit choppy and weak.
The rest of the forecast trails off into tiny, messy waves and strong onshore winds. Honestly, this stretch looks more interesting for a kite session than a surf session, given the stronger winds and poor wave quality. From August 6th through the 14th, there are a few mornings worth a look if you're desperate, but nothing is a standout. The long-range stuff around August 17th and 18th is flat and not worth considering.
Just the way it goes sometimes. Keep an eye on the charts, things can change. This is Rusty, signing off.
Short Range ForecastSome drizzle, heaviest during Wed night. Warm (max 23°C on Tue afternoon, min 19°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Warm (max 23°C on Sat afternoon, min 17°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | |||||||||||||||
AM | PM | 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 | WNW 10 | WNW 9 | WNW 9 | WNW 8 | WNW 9 | WNW 8 | WNW 8 | NW 10 | NW 9 | NW 9 | NNW 8 | NNW 8 | NNW 7 | NW 6 | NW 6 | NNW 7 | NW 7 | NW 10 | NW 10 | NW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 22 | 18 | 17 | 27 | 40 | 44 | 43 | 44 | 134 | 176 | 168 | 143 | 117 | 70 | 42 | 19 | 17 | 21 | 48 | 58 | 64 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | glassy | on | cross-on | glassy | cross-on | on | cross-on | cross-off | on | glassy | glassy | on | cross | cross-on | on | cross-on | cross-on | on | cross |
High Tide | 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 | 1:03PM2.97m | 1:51AM2.98m | 2:25PM3.17m | 3:06AM3.18m | |||||||
Low Tide | 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 | 6:34AM1.05m | 7:20PM0.94m | 7:56AM0.96m | 8:38PM0.72m | ||||||||
 | |  | |  | |  | |  | | |  | | | | | | | | | | |
 | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — | 7:01 | — | — | 7:03 | — | — | 7:03 | — | — |
 | — | — | 9:27 | — | — | 9:24 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 | — | — | 9:20 | — | — | 9:19 |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | 2 | — | — | — |
Temp °C | 21 | 22 | 22 | 22 | 23 | 22 | 21 | 22 | 22 | 19 | 22 | 20 | 20 | 22 | 21 | 20 | 23 | 22 | 21 | 23 | 22 |
Feels °C | 23 | 24 | 23 | 24 | 24 | 22 | 23 | 23 | 22 | 19 | 21 | 19 | 20 | 21 | 21 | 21 | 23 | 22 | 22 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | NW 7 | NW 7 | WNW 9 | WNW 9 | WNW 8 | WNW 9 | WNW 8 | WNW 8 | NW 10 | NW 9 | NW 9 | NNW 8 | NNW 8 | NNW 7 | NW 6 | NW 6 | NNW 7 | NW 7 | NW 10 | NW 10 | NW 9 |
| kJ | 22 | 12 | 17 | 27 | 40 | 44 | 43 | 44 | 134 | 176 | 168 | 143 | 117 | 70 | 42 | 19 | 17 | 21 | 48 | 58 | 64 |
Swell 2 Height (m) Direction Period (s) | WNW 10 | WNW 10 | NW 7 | NW 7 | — | NNW 4 | NW 11 | NW 11 | NNW 4 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | NW 9 | NW 11 | NW 5 | NW 5 | W 8 |
| kJ | 19 | 18 | 8 | 8 | — | 2 | 5 | 19 | 5 | 11 | 11 | 10 | 9 | 9 | 8 | 8 | 3 | 18 | 12 | 6 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | NNW 4 | — | — | NW 7 | — | — | — | — | — | — | — | — | — | — | NW 11 | W 9 | W 9 | W 8 | — |
| kJ | — | — | 2 | — | — | 2 | — | — | — | — | — | — | — | — | — | — | 5 | 2 | 2 | 1 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NNW 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 485 | 21 | 30 | 606 | 1 | 3 | 197 | 6 | 0 | 87 | 0 | 0 | 87 | 17 | 578 | 863 | 31 | 122 | 490 | 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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