Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 2 Aug 2026:
- Best quality surf: Friday 7 Aug, 5AM (local time) - 3ft (0.9m), 8s period, NNW swell with glassy winds.
- Most powerful swell: Sunday 9 Aug, 8PM (local time) - 4ft (1.2m), 9s period, NNW swell with 216 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 5AM (local time) - 3ft (0.9m), 8s period with NNW 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 5AM. 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 1.2m 9s and forecast to arrive on Sunday (Aug 09) at 8PM. 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+) | 5AM (Fri 7th Aug) | 3ft (0.9m) 8s |
| Best Surf | 5AM (Fri 7th Aug) | 3ft (0.9m) 8s |
| Most Powerful | 8PM (Sun 9th Aug) | 4ft (1.2m) 9s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
The Lowdown
Alright, Rusty here. Let's get straight into it.
To be honest, it's a tough start for the Basque Coast. The whole 16-day window is looking pretty flat and frustrated for the most part. We're looking at a long stretch of tiny, weak swell with rubbish wind. This isn't a total surprise for a quiet spell, but it's a long one. The first real glimpse of something decent doesn't show up until Monday the 17th of August, and even that's a long way off, so keep your expectations in check until then.
Let's start with the spot we've got data for: Guethary - Les Alcyons/Avalanche. This is an expert reef break, and it's a consistent one, but it needs the right combo. For the first two weeks, it's just not happening. From Sunday the 2nd right through to Saturday the 15th, we're looking at tiny swell—mostly under 2ft to 3ft—with a period that's all over the shop, mostly short-period junk between 6 and 10 seconds. The combined swell energy is weak, mostly under 100 (40 to 143), which is just not enough to get this reef firing. The wind is a killer too. It's mostly onshore from the WNW or NW, or a messy cross-on. There are a few glassy mornings, like Wednesday the 5th and again on the 12th, but the swell is so small it's a waste of a good morning. The water temp is about 77°, which is much warmer than normal for this time of year.
The only real standout on the horizon is Monday the 17th of August. The morning session is looking like the pick of the entire forecast. We've got a clean 4ft NW swell, with a period of 10 seconds. The combined energy jumps to 213 (moderate), which is the strongest we'll see. The wind is a light cross-offshore from the south, which will keep the waves clean and lined up on this reef. That's the one to circle on your calendar. It's a long way off, so the detail might shift, but it's the only window with a genuinely good surf condition. The afternoon on the 17th drops back to messy conditions.
So, there you have it. A long, dry spell, but one promising morning to aim for. Keep your eyes on the forecasts for the 17th.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed morning. Warm (max 23°C on Sun afternoon, min 19°C on Mon morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Wed night. Warm (max 22°C on Wed afternoon, min 18°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sun 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | ||||||||||||||
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) | NNW 6 | NW 7 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | WNW 8 | W 9 | WNW 8 | WNW 8 | NW 9 | NW 9 | NW 9 | NW 8 | NNW 8 | NW 7 | NW 6 | NNW 6 | NNW 6 | NNW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 17 | 43 | 19 | 18 | 17 | 27 | 40 | 39 | 38 | 26 | 123 | 142 | 176 | 158 | 74 | 54 | 42 | 30 | 65 | 56 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | on | glassy | on | on | glassy | glassy | on | cross-on | cross | on | cross-on | on | on | cross-on | cross-on | on | on |
High Tide | 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 | 1:03PM2.97m | 1:51AM2.98m | |||||||
Low Tide | 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 | 6:34AM1.05m | 7:20PM0.94m | ||||||||
 |  | |  | | |  | |  | |  |  | |  | | | | | | | |
 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — | 7:01 | — | — | 7:03 | — | — |
 | — | 9:28 | — | — | 9:27 | — | — | 9:24 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 | — | — | 9:20 |
mm | — | — | — | — | — | — | — | — | 2 | — | 1 | 1 | — | — | — | — | — | — | — | — |
Temp °C | 23 | 22 | 21 | 22 | 22 | 22 | 23 | 22 | 21 | 22 | 22 | 19 | 21 | 20 | 20 | 21 | 20 | 21 | 22 | 21 |
Feels °C | 23 | 21 | 22 | 24 | 23 | 24 | 24 | 22 | 24 | 23 | 22 | 19 | 21 | 19 | 20 | 20 | 19 | 20 | 20 | 20 |
Swell 1 Height (m) Direction Period (s) | NNW 6 | NW 7 | NW 4 | NW 4 | WNW 9 | WNW 9 | WNW 8 | W 9 | WNW 8 | WNW 8 | NW 9 | NW 9 | NW 9 | NW 8 | NNW 8 | NW 7 | NW 6 | NNW 6 | WNW 9 | NNW 6 |
| kJ | 17 | 43 | 9 | 4 | 17 | 27 | 40 | 39 | 38 | 26 | 123 | 142 | 176 | 158 | 74 | 54 | 42 | 30 | 8 | 56 |
Swell 2 Height (m) Direction Period (s) | NW 7 | WNW 11 | WNW 10 | WNW 10 | NNW 4 | NW 7 | NNW 7 | NNW 3 | N 3 | WNW 11 | — | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | N 6 | NW 10 | NW 10 |
| kJ | 7 | 11 | 19 | 18 | 2 | 13 | 5 | 1 | 1 | 12 | — | 12 | 10 | 10 | 9 | 9 | 8 | 7 | 4 | 4 |
Swell 3 Height (m) Direction Period (s) | WNW 9 | — | NNW 7 | NW 7 | NW 7 | — | — | NW 7 | NW 11 | — | — | — | — | — | — | — | — | WNW 9 | — | WNW 9 |
| kJ | 16 | — | 4 | 7 | 8 | — | — | 2 | 5 | — | — | — | — | — | — | — | — | 8 | — | 8 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NNW 4 | — | — | NNW 3 | — | — | — | — | — | — | — | WSW 3 | NNW 6 | — |
| kJ | — | — | — | — | — | — | 1 | — | — | 1 | — | — | — | — | — | — | — | 1 | 65 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 325 | 31 | 333 | 347 | 54 | 72 | 534 | 1 | 1 | 197 | 87 | 1 | 87 | 87 | 87 | 87 | 31 | 433 | 620 | 87 |
Best forecast wave conditions in La Cote Basque | ||||||||||||||||||||
Best forecast wave conditions in France | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Guethary - Les Alcyons/Avalanche surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest