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Guethary - Les Alcyons/Avalanche Surf Forecast
/ La Cote Basque (36 surf breaks) /
Surf Forecasts:
Guethary - Les Alcyons/Avalanche surfForecast / La Cote Basque / France
16 Day Weather and Surf, issued 7 pm Monday 11 May 2026 CESTForecast update in hr min s Forecast update imminent
Guethary - Les Alcyons/Avalanche surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Guethary - Les Alcyons/Avalanche sea temperature is
16.9° C
(Which is 2.3°C warmer than normal for this time of year)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 Sunday (May 17) at 2AM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.1m and 16s. 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 2.4m 12s and forecast to arrive on Monday (May 18) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Monday (May 18) at 8AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sun 17th May) | 3.5ft (1.1m) 8s |
| Best Surf | 11PM (Mon 18th May) | 8ft (2.4m) 12s |
| Most Powerful | 11PM (Mon 18th May) | 8ft (2.4m) 12s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 15mm), heaviest on Thu morning. Very mild (max 16°C on Mon night, min 13°C on Mon night). Winds increasing (calm on Mon night, fresh winds from the WNW by Thu afternoon). | Days 5-7 Weather SummaryHeavy rain (total 40mm), heaviest during Fri morning. Very mild (max 17°C on Sun afternoon, min 11°C on Fri morning). Winds decreasing (fresh winds from the WNW on Thu night, calm by Sun morning). | ||||||||||||||||||||
Tuesday 12 | Wednesday 13 | Thursday 14 | Friday 15 | Saturday 16 | Sunday 17 | Mon 18 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
NW 8 | NNW 6 | NNW 7 | NNW 7 | NW 5 | NW 5 | NW 6 | NW 7 | NW 8 | NW 9 | NW 9 | NW 9 | NW 9 | NW 9 | NW 9 | NW 8 | NW 8 | NW 8 | WNW 14 | WNW 13 | NW 13 | |
69 | 35 | 31 | 47 | 33 | 65 | 86 | 379 | 659 | 1074 | 828 | 783 | 519 | 318 | 262 | 181 | 93 | 75 | 402 | 1180 | 1028 | |
Wind (km/h) | |||||||||||||||||||||
glassy | cross-on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | glassy | glassy | cross-on | cross-on | cross-on | cross-on | |
High Tide | 1:13AM2.99m | 1:53PM2.94m | 2:08AM3.22m | 2:43PM3.21m | 2:59AM3.47m | 3:28PM3.48m | 3:46AM3.69m | 4:13PM3.72m | 4:34AM3.86m | 4:57PM3.89m | 5:21AM3.93m | 5:42PM3.98m | 6:10AM3.90m | 6:29PM3.98m | |||||||
Low Tide | 7:34AM0.88m | 7:53PM0.94m | 8:25AM0.62m | 8:43PM0.67m | 9:11AM0.38m | 9:31PM0.40m | 9:56AM0.18m | 10:17PM0.15m | 10:40AM0.06m | 11:03PM-0.02m | 11:25AM0.03m | 11:50PM-0.09m | 12:11PM0.08m | ||||||||
 | | |  |  | | | | |  |  | | | | |  |  | | | | | |
 | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — |
 | 9:19 | — | — | 9:20 | — | — | 9:21 | — | — | 9:22 | — | — | 9:22 | — | — | 9:23 | — | — | 9:24 | — | 9:25 |
— | — | — | 2 | 2 | 2 | 3 | 3 | 3 | 12 | 18 | 3 | 5 | 1 | 1 | — | — | — | — | — | — | |
Temp °C | 16 | 15 | 15 | 15 | 14 | 15 | 14 | 13 | 14 | 14 | 12 | 13 | 13 | 13 | 15 | 14 | 15 | 17 | 18 | 15 | 17 |
15 | 14 | 13 | 12 | 11 | 11 | 11 | 7 | 7 | 7 | 8 | 8 | 8 | 10 | 11 | 11 | 14 | 15 | 16 | 13 | 15 | |
Swell 1 Height (m) Direction Period (s) | NW 8 | NNW 6 | NNW 7 | NNW 7 | NW 11 | NW 10 | NW 8 | — | NW 13 | NW 12 | NW 9 | — | NW 9 | NW 9 | NW 9 | NW 8 | NW 8 | NW 8 | WNW 14 | WNW 13 | NW 13 |
 kJ | 69 | 35 | 31 | 47 | 19 | 15 | 18 | — | 63 | 148 | 828 | — | 519 | 318 | 262 | 181 | 93 | 75 | 402 | 1180 | 1028 |
Swell 2 Height (m) Direction Period (s) | W 9 | NW 8 | NW 8 | NW 13 | — | — | WNW 12 | — | — | — | NW 11 | — | — | — | — | W 16 | WNW 14 | NW 13 | NW 7 | — | — |
| kJ | 2 | 11 | 11 | 7 | — | — | 13 | — | — | — | 273 | — | — | — | — | 5 | 21 | 45 | 54 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 18 | NW 16 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 | 65 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NW 5 | NW 5 | NW 6 | NW 7 | NW 8 | NW 9 | — | NW 9 | — | — | — | — | — | — | — | — | WSW 4 |
| kJ | — | — | — | — | 33 | 65 | 86 | 379 | 659 | 1074 | — | 783 | — | — | — | — | — | — | — | — | 7 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 7 | 87 | 313 | 220 | 412 | 304 | 147 | 377 | 308 | 12 | 325 | 12 | 12 | 12 | 0 | 0 | 6 | 12 | 12 | 87 |
Best forecast wave conditions in La Cote Basque | |||||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.
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