Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 17 Oct 2026:
- Best quality surf: Thursday 22 Oct, 8AM (local time) - 11ft (3.5m), 12s period, NW swell with cross-offshore winds.
- Most powerful swell: Wednesday 21 Oct, 11PM (local time) - 13ft (4.0m), 13s period, NW swell with 4,891 kJ wave energy.
- Next surfable swell (1★+): Sunday 18 Oct, 5AM (local time) - 5.5ft (1.7m), 12s 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 Sunday (Oct 18) at 5AM. The primary swell is predicted to be 1.7m 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 4.0m 13s and forecast to arrive on Wednesday (Oct 21) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Friday (Oct 23) at 8AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Sun 18th Oct) | 5.5ft (1.7m) 12s |
| Best Surf | 8AM (Thu 22nd Oct) | 11ft (3.5m) 12s |
| Most Powerful | 11PM (Wed 21st Oct) | 13ft (4.0m) 13s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat afternoon. Very mild (max 16°C on Sat night, min 10°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 20mm), heaviest during Wed morning. Very mild (max 18°C on Thu afternoon, min 12°C on Thu morning). Winds decreasing (fresh winds from the W on Wed morning, light winds from the NW by Thu afternoon). | |||||||||||||||||||
Sat 17 | Sunday 18 | Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | ||||||||||||||
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 12 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | WNW 16 | WNW 15 | WNW 14 | NW 13 | WNW 10 | WNW 11 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 407 | 887 | 376 | 283 | 373 | 140 | 134 | 330 | 568 | 607 | 623 | 2920 | 2800 | 4351 | 2802 | 2430 | 2130 | 1912 | 3124 | 4323 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-off | cross-on | cross-off | cross-off | cross-off | glassy | cross-on | cross-on | cross-off | cross-on | cross-on | cross | cross-off | on | cross-off | cross-off | on | on |
High Tide | 9:29PM2.60m | 9:57AM2.68m | 10:49PM2.44m | 11:28AM2.60m | 00:30AM2.45m | 12:58PM2.69m | 1:43AM2.63m | 1:59PM2.90m | 2:32AM2.87m | 2:43PM3.15m | 3:11AM3.15m | 3:22PM3.41m | 3:47AM3.41m | |||||||
Low Tide | 3:22PM1.19m | 3:39AM1.37m | 4:33PM1.37m | 4:59AM1.49m | 6:04PM1.39m | 6:30AM1.44m | 7:21PM1.23m | 7:38AM1.25m | 8:14PM0.99m | 8:28AM1.00m | 8:56PM0.71m | 9:09AM0.73m | 9:33PM0.44m | |||||||
 |  |  |  |  | | |  | |  | |  | |  |  | | | | | | |
 | — | — | 8:22 | — | — | 8:23 | — | — | 8:25 | — | — | 8:26 | — | — | 8:27 | — | — | 8:29 | — | — |
 | 7:21 | — | — | 7:19 | — | — | 7:16 | — | — | 7:15 | — | — | 7:14 | — | — | 7:13 | — | — | 7:10 | — |
mm | 1 | — | — | — | — | — | 1 | — | — | 2 | — | 9 | 3 | 6 | — | — | — | — | — | 5 |
Temp °C | 15 | 16 | 11 | 16 | 14 | 11 | 11 | 11 | 13 | 16 | 14 | 14 | 15 | 14 | 14 | 18 | 16 | 16 | 21 | 17 |
Feels °C | 14 | 14 | 8 | 11 | 9 | 8 | 8 | 10 | 11 | 12 | 11 | 8 | 9 | 10 | 11 | 16 | 14 | 12 | 18 | 15 |
Swell 1 Height (m) Direction Period (s) | NNW 8 | NW 12 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | WNW 16 | WNW 15 | WNW 14 | NW 13 | — | WNW 11 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 12 | NW 13 |
| kJ | 285 | 887 | 376 | 283 | 373 | 140 | 134 | 330 | 568 | 607 | 623 | — | 2800 | 4351 | 2802 | 2430 | 2130 | 1912 | 3124 | 4323 |
Swell 2 Height (m) Direction Period (s) | NW 12 | — | N 7 | NW 7 | — | NNW 5 | WNW 18 | NNW 7 | NW 9 | NW 4 | WNW 4 | — | — | — | — | — | — | — | — | — |
| kJ | 407 | — | 92 | 14 | — | 10 | 31 | 18 | 23 | 3 | 8 | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 20 | W 15 | NW 10 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 8 | 4 | 34 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | N 6 | — | — | — | — | — | WNW 10 | — | WNW 10 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 64 | — | — | — | — | — | 33 | — | 2920 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 197 | 87 | 0 | 87 | 0 | 0 | 0 | 0 | 12 | 147 | 0 | 374 | 147 | 4 | 0 | 4 | 0 | 0 | 12 | 12 |
Best forecast wave conditions in La Cote Basque | ||||||||||||||||||||
Best forecast wave conditions in France | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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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