Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 1 Aug 2026:
- Best quality surf: Friday 7 Aug, 5AM (local time) - 3ft (0.9m), 8s period, NW swell with glassy winds.
- Most powerful swell: Thursday 6 Aug, 2PM (local time) - 3.5ft (1.0m), 8s period, NW swell with 142 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 5AM (local time) - 3ft (0.9m), 8s 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 Friday (Aug 07) at 5AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.3m and 10s. 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 1.0m 8s and forecast to arrive on Thursday (Aug 06) 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+) | 5AM (Fri 7th Aug) | 3ft (0.9m) 8s |
| Best Surf | 5AM (Fri 7th Aug) | 3ft (0.9m) 8s |
| Most Powerful | 2PM (Thu 6th Aug) | 3.5ft (1.0m) 8s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
The Lowdown
Alright, let’s talk about Guethary – Les Alcyons/Avalanche. The water’s at 25°C, which is much warmer than usual for this time of year – about 3°C above the average. That’s pretty noticeable.
Honestly, the next 16 days are a tough slog. There’s nothing worth paddling out for until the 14th of August. The first 13 days? All poor surf conditions. We’re looking at tiny waves, mostly 0.3ft to 0.7ft, with weak energy – the combined swell energy is stuck between 18 and 98, which is negligible. Winds are mostly onshore or cross-onshore, and even when it goes glassy on the 4th, 7th, and 11th mornings, there’s no swell to work with.
Then on Friday the 14th of August, the swell finally bumps up to 1ft from the NW with a short 6-second period. The combined energy hits 113 and 120 – that’s moderate. But the wind is still onshore, conditions are poor, and the short period means the waves are weak and messy. This reef break needs a clean W swell to really fire, and the 1ft NW swell isn’t the right direction. It’s just not enough.
This is a consistent, exposed reef for experts, but the swell is too small and the wind is all wrong. If you’re a kiter, the choppy conditions on the 14th might be more fun than trying to paddle. For surfers? There’s nothing to get excited about.
Blank runs happen here. Forecasts can turn around, but this one’s a long wait.
Rusty
Short Range ForecastLight rain (total 3mm), mostly falling on Mon afternoon. Warm (max 23°C on Sun afternoon, min 18°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Wed night. Warm (max 23°C on Tue afternoon, min 18°C on Fri morning). Wind will be generally light. | |||||||||||||||||||
Sat 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | ||||||||||||||
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 8 | NNW 6 | NNW 6 | NNW 6 | NW 6 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | W 9 | WNW 9 | WNW 8 | WNW 8 | WNW 8 | NW 9 | NW 9 | NW 8 | NW 8 | NNW 8 | NW 5 |
Wave Graph  | ||||||||||||||||||||
 kJ | 46 | 26 | 18 | 25 | 28 | 19 | 18 | 18 | 27 | 39 | 26 | 24 | 22 | 41 | 107 | 123 | 120 | 95 | 74 | 66 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | cross-on | cross-on | glassy | glassy | glassy | on | cross-on | on | on | cross-on | cross | cross-on | on | on | on | cross |
High Tide | 7:14PM3.71m | 7:33AM3.44m | 7:47PM3.66m | 8:08AM3.39m | 8:23PM3.55m | 8:46AM3.30m | 9:03PM3.40m | 9:30AM3.18m | 9:53PM3.21m | 10:24AM3.04m | 10:56PM3.03m | 11:36AM2.95m | 00:20AM2.92m | |||||||
Low Tide | 1:25AM0.31m | 1:33PM0.40m | 1:59AM0.36m | 2:09PM0.48m | 2:36AM0.46m | 2:49PM0.60m | 3:18AM0.62m | 3:37PM0.76m | 4:09AM0.80m | 4:37PM0.91m | 5:14AM0.97m | 5:53PM1.00m | ||||||||
 |  | | |  |  |  |  | | | | | | |  | | | | | | |
 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — | 7:01 | — | — |
 | — | 9:29 | — | — | 9:28 | — | — | 9:27 | — | — | 9:24 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 |
mm | — | — | — | — | — | — | 2 | 1 | — | — | — | — | — | 9 | — | — | — | — | — | — |
Temp °C | 22 | 21 | 22 | 23 | 22 | 21 | 22 | 22 | 21 | 23 | 22 | 22 | 23 | 22 | 20 | 22 | 20 | 20 | 22 | 21 |
Feels °C | 22 | 21 | 23 | 22 | 21 | 22 | 24 | 24 | 23 | 23 | 22 | 24 | 24 | 23 | 22 | 22 | 20 | 20 | 21 | 21 |
Swell 1 Height (m) Direction Period (s) | NW 8 | NNW 6 | NNW 6 | NNW 6 | NW 6 | NW 4 | NW 4 | NW 5 | WNW 9 | W 9 | WNW 9 | WNW 8 | WNW 8 | WNW 8 | NW 9 | NW 9 | NW 8 | NW 8 | NNW 8 | WNW 9 |
| kJ | 46 | 26 | 18 | 25 | 28 | 9 | 5 | 6 | 27 | 39 | 26 | 24 | 22 | 41 | 107 | 123 | 120 | 95 | 74 | 9 |
Swell 2 Height (m) Direction Period (s) | WNW 10 | WNW 9 | NW 7 | NW 7 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NW 5 | NNW 7 | NNW 3 | NNW 4 | W 11 | NNW 4 | — | — | W 10 | WNW 10 | WNW 10 | — |
| kJ | 10 | 16 | 8 | 8 | 11 | 19 | 18 | 18 | 6 | 5 | 2 | 3 | 2 | 1 | — | — | 8 | 9 | 9 | — |
Swell 3 Height (m) Direction Period (s) | W 9 | NW 8 | WNW 9 | WNW 9 | — | NNW 7 | NW 7 | — | NNW 7 | — | NW 7 | N 7 | — | N 4 | — | — | — | — | — | — |
| kJ | 1 | 9 | 16 | 8 | — | 4 | 7 | — | 5 | — | 2 | 1 | — | 1 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NNW 4 | — | — | NNW 4 | — | — | — | — | — | — | NW 5 |
| kJ | — | — | — | — | — | — | — | — | — | 2 | — | — | 3 | — | — | — | — | — | — | 66 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 197 | 17 | 210 | 583 | 31 | 485 | 21 | 21 | 21 | 534 | 325 | 325 | 490 | 7 | 1 | 110 | 87 | 2 | 87 | 17 |
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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