Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 4 Oct 2026:
- Best quality surf: Friday 9 Oct, 2AM (local time) - 4.5ft (1.4m), 8s period, NNW swell with cross-offshore winds.
- Most powerful swell: Thursday 8 Oct, 2PM (local time) - 7.5ft (2.3m), 10s period, NW swell with 972 kJ wave energy.
- Next surfable swell (1★+): Sunday 4 Oct, 8AM (local time) - 4ft (1.2m), 11s 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 Sunday (Oct 04) at 8AM. The primary swell is predicted to be 1.2m and 11s period with a secondary swell of 0.5m and 5s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Guethary - Les Alcyons/Avalanche in the next 16 days are 2.3m 10s and forecast to arrive on Thursday (Oct 08) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sun 4th Oct) | 4ft (1.2m) 11s |
| Best Surf | 2AM (Fri 9th Oct) | 4.5ft (1.4m) 8s |
| Most Powerful | 2PM (Thu 8th Oct) | 7.5ft (2.3m) 10s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Short Range ForecastHeavy rain (total 21mm), heaviest during Tue night. Warm (max 27°C on Mon afternoon, min 18°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 20mm), heaviest during Wed morning. Very mild (max 19°C on Wed afternoon, min 13°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Sunday 4 | Monday 5 | Tuesday 6 | Wednesday 7 | Thursday 8 | Friday 9 | Saturday 10 | |||||||||||||||
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 11 | NW 11 | NW 10 | NW 10 | NW 11 | NW 10 | NW 10 | NW 12 | NW 11 | NW 10 | NW 10 | WNW 9 | NW 9 | NW 9 | NNW 8 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 357 | 191 | 170 | 167 | 220 | 156 | 122 | 232 | 198 | 212 | 204 | 615 | 904 | 822 | 267 | 561 | 445 | 254 | 228 | 282 | 326 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | off | off | cross | cross-off | cross-off | glassy | cross | cross-off | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-on | off | glassy | cross-on | cross-off |
High Tide | 11:21AM2.95m | 00:25AM2.76m | 12:58PM3.02m | 1:51AM2.92m | 2:13PM3.26m | 2:52AM3.17m | 3:09PM3.52m | 3:40AM3.42m | 3:54PM3.74m | 4:20AM3.62m | 4:35PM3.87m | 4:56AM3.75m | 5:11PM3.91m | ||||||||
Low Tide | 5:46PM1.02m | 6:20AM1.19m | 7:18PM0.90m | 7:43AM1.00m | 8:27PM0.66m | 8:44AM0.73m | 9:18PM0.40m | 9:32AM0.47m | 10:00PM0.20m | 10:13AM0.26m | 10:38PM0.08m | 10:51AM0.12m | 11:12PM0.05m | ||||||||
 |  |  |  | |  | | |  |  |  | | | |  |  | | | | | | |
 | 8:06 | — | — | 8:07 | — | — | 8:07 | — | — | 8:10 | — | — | 8:11 | — | — | 8:11 | — | — | 8:12 | — | — |
 | — | 7:43 | — | — | 7:40 | — | — | 7:38 | — | — | 7:37 | — | — | 7:36 | — | — | 7:34 | — | — | 7:31 | — |
mm | — | 2 | 5 | — | — | — | — | 1 | 13 | 9 | 1 | 7 | 2 | 1 | — | — | — | — | — | — | — |
Temp °C | 19 | 23 | 21 | 21 | 27 | 26 | 23 | 27 | 22 | 18 | 19 | 18 | 18 | 18 | 18 | 14 | 18 | 17 | 14 | 18 | 17 |
Feels °C | 20 | 24 | 22 | 22 | 27 | 26 | 23 | 26 | 23 | 18 | 20 | 15 | 18 | 17 | 17 | 13 | 17 | 15 | 12 | 16 | 17 |
Swell 1 Height (m) Direction Period (s) | NW 11 | NW 11 | NW 10 | NW 10 | NW 11 | NW 10 | NW 10 | NW 12 | NW 11 | NW 10 | NW 10 | — | NW 9 | NW 9 | NNW 8 | NW 12 | NW 11 | NW 11 | NW 11 | NW 11 | NW 11 |
| kJ | 357 | 191 | 170 | 167 | 220 | 156 | 122 | 232 | 198 | 212 | 204 | — | 904 | 822 | 267 | 561 | 445 | 254 | 228 | 282 | 326 |
Swell 2 Height (m) Direction Period (s) | — | WNW 10 | NNW 6 | NNW 5 | — | — | NW 13 | — | — | WNW 5 | — | — | — | — | NW 10 | — | — | — | — | — | N 4 |
| kJ | — | 34 | 6 | 2 | — | — | 103 | — | — | 19 | — | — | — | — | 153 | — | — | — | — | — | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NW 13 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 88 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | NNW 5 | — | — | — | — | — | — | W 3 | — | WNW 6 | WNW 9 | — | — | — | — | — | — | — | — | — |
| kJ | — | 9 | — | — | — | — | — | — | 2 | — | 91 | 615 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 12 | 0 | 49 | 12 | 87 | 87 | 0 | 0 | 87 | 0 | 0 | 87 | 0 |
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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