Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 21 Oct 2026:
- Best quality surf: Friday 23 Oct, 2PM (local time) - 21ft (6.5m), 16s period, NW swell with cross-onshore winds.
- Most powerful swell: Friday 23 Oct, 2PM (local time) - 21ft (6.5m), 16s period, NW swell with 19,936 kJ wave energy.
- Next surfable swell (1★+): Thursday 22 Oct, 5AM (local time) - 10ft (3.0m), 12s 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 (Oct 22) at 5AM. The primary swell is predicted to be 3.0m and 12s period. 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 6.5m 16s and forecast to arrive on Friday (Oct 23) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Friday (Oct 23) at 2AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 22nd Oct) | 10ft (3.0m) 12s |
| Best Surf | 2PM (Fri 23rd Oct) | 21ft (6.5m) 16s |
| Most Powerful | 2PM (Fri 23rd Oct) | 21ft (6.5m) 16s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Short Range ForecastHeavy rain (total 26mm), heaviest during Wed night. Very mild (max 19°C on Thu afternoon, min 12°C on Thu morning). Winds increasing (calm on Thu afternoon, strong winds from the W by Fri morning). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sat afternoon. Very mild (max 19°C on Mon afternoon, min 14°C on Sat afternoon). Wind will be generally light. | |||||||||||||||||||
Wed 21 | Thursday 22 | Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | Tuesday 27 | ||||||||||||||
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 11 | NW 13 | NW 12 | NW 12 | NW 12 | WNW 13 | NW 16 | NW 13 | NW 12 | NW 12 | NW 13 | NW 11 | NW 12 | NW 12 | NW 13 | NW 13 | NW 12 | WNW 12 | WNW 12 | WNW 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 3201 | 3776 | 2320 | 1913 | 1866 | 11605 | 16756 | 6450 | 2894 | 2018 | 2362 | 2343 | 3517 | 3422 | 2204 | 1942 | 884 | 710 | 1256 | 1825 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-off | glassy | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-off | glassy | cross | off | cross-on | cross-on | cross-on |
High Tide | 2:32AM2.87m | 2:43PM3.15m | 3:11AM3.15m | 3:22PM3.41m | 3:47AM3.41m | 4:00PM3.65m | 4:22AM3.65m | 4:37PM3.84m | 4:59AM3.83m | 5:16PM3.94m | 5:36AM3.93m | 5:57PM3.95m | ||||||||
Low Tide | 8:14PM0.99m | 8:28AM1.00m | 8:56PM0.71m | 9:09AM0.73m | 9:33PM0.44m | 9:47AM0.46m | 10:09PM0.22m | 10:24AM0.22m | 10:45PM0.06m | 11:02AM0.05m | 11:23PM-0.01m | 11:42AM-0.04m | 00:02AM0.03m | |||||||
 |  |  | |  | | | | | |  |  | |  | |  |  | | | | |
 | — | — | 8:27 | — | — | 8:29 | — | — | 8:30 | — | — | 7:32 | — | — | 8:33 | — | — | 8:33 | — | — |
 | 7:14 | — | — | 7:13 | — | — | 7:10 | — | — | 7:09 | — | — | 6:07 | — | — | 7:07 | — | — | 7:05 | — |
mm | 2 | 4 | — | — | 1 | 3 | 4 | 8 | 4 | 2 | — | — | — | — | — | — | — | — | — | 6 |
Temp °C | 16 | 15 | 14 | 19 | 18 | 15 | 15 | 15 | 15 | 15 | 16 | 17 | 18 | 17 | 18 | 19 | 18 | 18 | 19 | 17 |
Feels °C | 10 | 12 | 12 | 18 | 14 | 7 | 8 | 10 | 12 | 12 | 13 | 14 | 15 | 15 | 18 | 19 | 18 | 16 | 16 | 15 |
Swell 1 Height (m) Direction Period (s) | NW 11 | NW 13 | NW 12 | NW 12 | NW 12 | — | — | NW 13 | NW 12 | NW 12 | NW 13 | NW 11 | NW 12 | NW 12 | NW 13 | NW 13 | NW 12 | WNW 12 | WNW 12 | WNW 12 |
| kJ | 3201 | 3776 | 2320 | 1913 | 1866 | — | — | 6450 | 2894 | 2018 | 2362 | 2343 | 3517 | 3422 | 2204 | 1942 | 884 | 710 | 1256 | 1825 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WNW 12 | WNW 12 | NW 11 | — | WNW 15 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 83 | 301 | 97 | — | 1193 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SSW 3 | WNW 13 | NW 16 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 7 | 11605 | 16756 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 341 | 4 | 0 | 0 | 12 | 374 | 341 | 49 | 12 | 12 | 6 | 12 | 12 | 0 | 0 | 6 | 0 | 12 | 147 | 87 |
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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