Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 20 Jul 2026:
- Most powerful swell: Monday 27 Jul, 8AM (local time) - 3ft (0.9m), 10s period, NW swell with 157 kJ wave energy.
Best Forecast Surf Conditions for Guethary - Les Alcyons/Avalanche this week:
The most powerful waves expected at Guethary - Les Alcyons/Avalanche in the next 16 days are 0.9m 10s and forecast to arrive on Monday (Jul 27) at 8AM. 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+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Mon 27th Jul) | 3ft (0.9m) 10s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Short Range ForecastMostly dry. Warm (max 25°C on Wed afternoon, min 19°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Sat afternoon. Warm (max 28°C on Thu afternoon, min 19°C on Fri morning). Winds increasing (calm on Fri morning, fresh winds from the W by Sat morning). | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | |||||||||||||||
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) | NNW 6 | NNW 7 | NNW 7 | NNW 7 | N 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 | NNW 5 | NNW 5 | NW 5 | NNW 6 | NW 9 | NW 12 | NW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 53 | 77 | 139 | 96 | 92 | 127 | 42 | 39 | 80 | 53 | 38 | 72 | 25 | 23 | 18 | 14 | 14 | 21 | 13 | 51 | 96 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | cross | cross-on | on | cross | glassy | on | cross | cross | on | cross-off | on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 9:43AM3.19m | 10:03PM3.26m | 10:31AM2.99m | 10:55PM2.98m | 11:27AM2.83m | 11:58PM2.77m | 12:35PM2.74m | 1:13AM2.67m | 1:48PM2.75m | 2:26AM2.70m | 2:52PM2.86m | 3:24AM2.81m | 3:43PM3.02m | 4:10AM2.97m | |||||||
Low Tide | 3:40PM0.70m | 4:12AM0.78m | 4:32PM0.94m | 5:04AM1.02m | 5:33PM1.14m | 6:05AM1.20m | 6:43PM1.24m | 7:14AM1.27m | 7:55PM1.23m | 8:20AM1.23m | 8:57PM1.11m | 9:16AM1.10m | 9:48PM0.94m | ||||||||
 | |  | | | |  | | | | | | | |  |  | |  |  |  |  | |
 | 6:43 | — | — | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — | 6:47 | — | — | 6:48 | — | — | 6:48 | — | — |
 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:38 | — | — | 9:37 | — | — | 9:37 | — | — | 9:36 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 5 | 5 | 4 | 1 | 5 |
Temp °C | 23 | 24 | 23 | 22 | 24 | 23 | 22 | 25 | 24 | 24 | 28 | 26 | 23 | 24 | 22 | 22 | 22 | 21 | 19 | 21 | 21 |
Feels °C | 25 | 23 | 22 | 22 | 24 | 21 | 22 | 24 | 24 | 24 | 26 | 25 | 23 | 24 | 21 | 20 | 20 | 19 | 16 | 17 | 19 |
Swell 1 Height (m) Direction Period (s) | NNW 6 | NNW 7 | NNW 7 | NNW 7 | N 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NW 9 | NNW 5 | NNW 5 | N 5 | NNW 6 | NNW 5 | NW 12 | NNW 6 |
| kJ | 53 | 77 | 139 | 96 | 92 | 127 | 42 | 39 | 80 | 53 | 38 | 72 | 25 | 3 | 18 | 14 | 2 | 21 | 10 | 51 | 33 |
Swell 2 Height (m) Direction Period (s) | NW 8 | NW 13 | NW 12 | W 4 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | NW 9 | — | NW 8 | NW 8 | W 8 | NNW 10 | NW 9 | NW 6 | NW 11 |
| kJ | 10 | 6 | 6 | 2 | 11 | 10 | 10 | 9 | 9 | 9 | 8 | 8 | 3 | — | 3 | 3 | 1 | 10 | 13 | 6 | 96 |
Swell 3 Height (m) Direction Period (s) | NW 10 | — | — | WNW 11 | — | — | — | — | — | — | — | — | — | — | — | — | NW 11 | W 8 | NW 13 | NW 8 | WNW 9 |
| kJ | 4 | — | — | 12 | — | — | — | — | — | — | — | — | — | — | — | — | 5 | 1 | 7 | 11 | 8 |
Wind waves Height (m) Direction Period (s) | — | — | WSW 3 | — | — | — | — | — | — | — | — | — | — | NNW 5 | — | W 3 | NW 5 | — | — | NNW 5 | — |
| kJ | — | — | 1 | — | — | — | — | — | — | — | — | — | — | 23 | — | 1 | 14 | — | — | 15 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 87 | 12 | 27 | 87 | 12 | 1 | 87 | 17 | 1 | 197 | 2 | 423 | 881 | 911 | 970 | 1597 | 583 | 294 | 436 | 49 |
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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