Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 9 Jul 2026:
- Best quality surf: Saturday 11 Jul, 5AM (local time) - 2.5ft (0.8m), 9s period, WNW swell with glassy winds.
- Most powerful swell: Saturday 11 Jul, 2AM (local time) - 2.5ft (0.8m), 9s period, WNW swell with 106 kJ wave energy.
- Next surfable swell (1★+): Saturday 11 Jul, 5AM (local time) - 2.5ft (0.8m), 9s period with WNW 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 Saturday (Jul 11) at 5AM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.2m and 13s. 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 0.8m 9s and forecast to arrive on Saturday (Jul 11) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Sat 11th Jul) | 2.5ft (0.8m) 9s |
| Best Surf | 5AM (Sat 11th Jul) | 2.5ft (0.8m) 9s |
| Most Powerful | 2AM (Sat 11th Jul) | 2.5ft (0.8m) 9s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Alright, folks, Rusty here with the long-range look for the Basque Country. We're focusing on one spot, the expert-only reef at Guethary - Les Alcyons/Avalanche.
Truth be told, the next week and a half is a bit of a tough beat for us. The first real standouts are a long way off, so you'll be waiting for a while. Let's get into it.
From Friday the 10th right through until Monday the 21st of July, conditions are mostly poor, with weak swell and messy winds. There’s a tiny window on the morning of Saturday the 11th with some cross-offshore wind and a clean-looking wave of 2ft, but the swell is short-period and the energy is weak (102). It's surfable, but it's not going to be a classic.
We then hit a long, flat gap. The models show a moderate energy pulse (374) on the morning of Sunday the 19th with a 5ft swell from the NW, but the cross-onshore wind and rain showers will ruin it. It’s more of a kite-surf setup than a paddle session that day. Monday the 20th is no better with strong wind and rain.
Finally, we get a proper look-in. The first real highlight arrives on the morning of Thursday the 24th of July. The wind is light, cross-offshore from the ENE, and the surf will be clean. The swell is 3ft from the NW with a longer period of 10 seconds and moderate energy (141). It's a solid, surfable wave on offer, and that clean glassy surface will make all the difference. The water temp is about average for the time of year.
If you can wait, the morning of Friday the 25th is the other one to circle. It’s a bit messier with the cross-onshore wind, but the swell has a longer period (11 seconds) and the energy is climbing (238). Not a classic, but a better wave shape and punch for the experts.
So, patience is the key. The first week and a half is mostly a write-off. The standout is the morning of Thursday the 24th at Guethary - Les Alcyons/Avalanche. It’s the best on offer. Keep an eye on the longer range, but for now, don't bother waxing up until the 24th.
Rusty.
Short Range ForecastMostly dry. Warm (max 34°C on Sat afternoon, min 20°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Tue afternoon, min 18°C on Tue morning). Wind will be generally light. | ||||||||||||||||||||
Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thu 16 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | NW 11 | NW 10 | WNW 10 | WNW 9 | NW 9 | WNW 6 | WNW 6 | NW 6 | NW 5 | NNW 5 | WNW 11 | NW 4 | NW 4 | NW 6 | NW 6 | NW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 78 | 56 | 76 | 106 | 65 | 60 | 51 | 61 | 55 | 39 | 63 | 54 | 25 | 12 | 9 | 12 | 11 | 15 | 61 | 39 | 36 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | glassy | cross | cross-off | cross-on | off | glassy | cross-on | cross-on | on | cross-on | cross-on | glassy | cross-on | cross | on | on | cross-on | cross-on | on |
High Tide | 00:41AM3.08m | 1:22PM3.08m | 1:57AM3.16m | 2:32PM3.26m | 3:07AM3.32m | 3:34PM3.50m | 4:09AM3.50m | 4:31PM3.75m | 5:04AM3.66m | 5:23PM3.96m | 5:55AM3.75m | 6:12PM4.09m | 6:42AM3.77m | 6:59PM4.11m | |||||||
Low Tide | 6:59AM0.85m | 7:34PM0.83m | 8:08AM0.76m | 8:43PM0.63m | 9:11AM0.60m | 9:45PM0.39m | 10:08AM0.42m | 10:41PM0.15m | 11:00AM0.25m | 11:33PM-0.02m | 11:49AM0.14m | 00:22AM-0.09m | 12:35PM0.09m | ||||||||
 | | |  |  | |  | | |  |  | | | | | | | | |  | | |
 | — | 6:35 | — | — | 6:35 | — | — | 6:35 | — | — | 6:37 | — | — | 6:37 | — | — | 6:39 | — | — | 6:39 | — |
 | 9:47 | — | — | 9:47 | — | — | 9:46 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | 9:44 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — |
Temp °C | 25 | 22 | 25 | 23 | 27 | 34 | 32 | 32 | 34 | 23 | 21 | 22 | 21 | 22 | 24 | 22 | 22 | 22 | 21 | 21 | 22 |
Feels °C | 27 | 24 | 27 | 25 | 28 | 32 | 32 | 31 | 32 | 24 | 22 | 23 | 22 | 24 | 25 | 23 | 23 | 22 | 21 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | NW 8 | NW 10 | WNW 10 | WNW 9 | NW 9 | WNW 6 | WNW 6 | NW 6 | NW 5 | NNW 5 | NW 4 | WNW 10 | WNW 10 | NW 6 | NW 6 | NW 6 |
| kJ | 78 | 56 | 76 | 106 | 65 | 55 | 51 | 61 | 55 | 38 | 63 | 54 | 25 | 12 | 9 | 10 | 10 | 9 | 61 | 39 | 36 |
Swell 2 Height (m) Direction Period (s) | WNW 6 | NW 4 | NW 5 | NW 13 | NW 12 | NW 11 | N 5 | NNW 5 | NNW 4 | — | NW 9 | NW 8 | NW 8 | NW 8 | NW 7 | WNW 11 | W 8 | W 7 | WNW 9 | WNW 9 | W 9 |
| kJ | 3 | 16 | 10 | 7 | 37 | 60 | 12 | 4 | 2 | — | 13 | 11 | 10 | 2 | 2 | 12 | 1 | 1 | 8 | 8 | 6 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | WNW 8 | — | — | — | — | — | W 14 | W 8 | W 12 | WNW 8 | NW 7 | N 7 | — | — | — |
| kJ | — | — | — | — | — | — | 28 | — | — | — | — | — | 4 | 1 | 3 | 6 | 2 | 1 | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 3 | — | — | — | — | — | — | — | NNW 2 | WNW 5 | — | — | — | — | — | — | NW 4 | NW 4 | — | — | — |
| kJ | 4 | — | — | — | — | — | — | — | 1 | 39 | — | — | — | — | — | — | 11 | 15 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 161 | 17 | 1 | 13 | 0 | 47 | 1 | 1 | 162 | 220 | 111 | 356 | 333 | 433 | 490 | 526 | 526 | 680 | 43 | 313 | 636 |
Best forecast wave conditions in La Cote Basque | |||||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Guethary - Les Alcyons/Avalanche surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest