Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 4 Jul 2026:
- Best quality surf: Saturday 4 Jul, 8AM (local time) - 4ft (1.2m), 10s period, WNW swell with glassy winds.
- Most powerful swell: Saturday 4 Jul, 8AM (local time) - 4ft (1.2m), 10s period, WNW swell with 261 kJ wave energy.
- Next surfable swell (1★+): Saturday 4 Jul, 8AM (local time) - 4ft (1.2m), 10s 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 04) at 8AM. The primary swell is predicted to be 1.2m and 10s period. 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 1.2m 10s and forecast to arrive on Saturday (Jul 04) at 8AM. Winds are predicted to be glassy at the time the swell arrives.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sat 4th Jul) | 4ft (1.2m) 10s |
| Best Surf | 8AM (Sat 4th Jul) | 4ft (1.2m) 10s |
| Most Powerful | 8AM (Sat 4th Jul) | 4ft (1.2m) 10s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Updates in hr min s Forecast update imminent
Alright folks, Rusty here. Let's take a good, hard look at what Guethary’s Les Alcyons/Avalanche has in store for us over the next couple of weeks.
Straight up, the news isn't great. We're looking at a long, frustrating stretch ahead. For the first week, there's barely enough energy to get excited about, and the conditions are mostly messy. From Saturday the 4th right through to Thursday the 10th, the wave energy is tiny, with values like 225 (moderate) on Saturday morning dropping to as low as 29 (weak) by Wednesday. The only real highlight in that whole period is Saturday morning, the 4th of July, with a 4ft swell from the NW at a 10-second period, but the wind is onshore from the NW at 3 mph. It’s clean enough to be surfable, but the conditions are marginal and the tide might be an issue. After that, it’s a whole lot of nothing — poor surf, tiny waves, and onshore winds. The water temp is a very warm 75°, which is 8° above normal. That’s very unusual for this time of year.
The second week offers a little more hope. By Sunday the 12th, we see a bump in energy. The morning brings a 4ft NW swell at 10 seconds, with combined energy of 216 (moderate), but the wind is onshore again from the NW at 6 mph. It’s still marginal. The real standout pops up on Monday the 13th. The morning session is the best of the whole outlook: a 4ft NW swell, period of 9 seconds, with glassy conditions and a light NW wind at 3 mph. The combined energy is 180 (moderate). It’s surfable but very ordinary — still, it’s the cleanest we’ll get.
Beyond that, it’s back to weak, wind-affected slop. The long-range stuff from the 14th to the 19th is all poor, with tiny swells (1ft to 3ft) and mostly cross-on or onshore winds. Not worth getting your hopes up for.
Given the constant onshore wind and the small, weak swell, this setup looks more appealing for kite surfing than paddle surfing on most days. Crowds are often a factor at Les Alcyons/Avalanche, but to be honest, I doubt many will be out in this.
Stay patient, folks. It’s a lean run.
Rusty.
Short Range ForecastMostly dry. Warm (max 34°C on Mon afternoon, min 19°C on Sat morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Tue afternoon, min 19°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 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 10 | WNW 10 | WNW 10 | NW 11 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | NW 8 | WNW 8 | NW 8 | WNW 5 | WNW 5 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 225 | 164 | 120 | 58 | 51 | 47 | 52 | 51 | 38 | 35 | 28 | 17 | 12 | 20 | 39 | 54 | 59 | 55 | 56 | 55 | 55 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross | cross | cross-on | cross-off | cross-off | cross-on | cross | glassy | on | cross | on | on | cross | glassy | on | glassy | glassy | on | cross |
High Tide | 8:15PM3.42m | 8:38AM3.13m | 8:53PM3.35m | 9:20AM3.07m | 9:36PM3.26m | 10:08AM3.01m | 10:27PM3.17m | 11:04AM2.97m | 11:29PM3.09m | 12:10PM2.99m | 00:41AM3.08m | 1:22PM3.08m | 1:57AM3.16m | ||||||||
Low Tide | 1:59PM0.66m | 2:30AM0.61m | 2:38PM0.73m | 3:10AM0.67m | 3:21PM0.81m | 3:55AM0.74m | 4:11PM0.90m | 4:48AM0.81m | 5:11PM0.96m | 5:51AM0.86m | 6:21PM0.95m | 6:59AM0.85m | 7:34PM0.83m | ||||||||
 | |  | | | | | | | | | | |  | | | |  | | | | |
 | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:33 | — | — | 6:33 | — | — | 6:35 | — | — |
 | — | — | 9:50 | — | — | 9:50 | — | — | 9:49 | — | — | 9:49 | — | — | 9:49 | — | — | 9:47 | — | — | 9:47 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 23 | 22 | 23 | 29 | 26 | 27 | 34 | 30 | 27 | 28 | 24 | 22 | 23 | 21 | 23 | 24 | 22 | 25 | 28 | 22 |
Feels °C | 23 | 23 | 22 | 23 | 27 | 25 | 26 | 31 | 30 | 27 | 27 | 26 | 23 | 24 | 21 | 24 | 24 | 22 | 27 | 29 | 21 |
Swell 1 Height (m) Direction Period (s) | NW 10 | WNW 10 | WNW 10 | NNW 5 | NW 10 | N 5 | NW 9 | NW 9 | N 5 | NW 8 | WNW 8 | NW 8 | WNW 5 | WNW 5 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 |
| kJ | 225 | 164 | 120 | 23 | 51 | 20 | 52 | 51 | 23 | 35 | 28 | 17 | 12 | 15 | 39 | 54 | 59 | 55 | 56 | 55 | 55 |
Swell 2 Height (m) Direction Period (s) | — | N 5 | NNW 5 | WNW 10 | WNW 10 | NW 10 | N 5 | — | NW 9 | NNW 5 | NNW 5 | NW 4 | WNW 8 | WNW 10 | N 4 | NW 4 | NW 4 | WNW 4 | N 4 | — | NNW 3 |
| kJ | — | 2 | 20 | 52 | 36 | 47 | 13 | — | 38 | 8 | 4 | 2 | 6 | 20 | 2 | 10 | 7 | 2 | 1 | — | 1 |
Swell 3 Height (m) Direction Period (s) | — | NW 13 | NW 12 | NW 11 | NW 7 | WNW 9 | — | — | — | W 3 | — | NNW 5 | WNW 10 | NW 8 | NW 8 | — | — | N 5 | — | — | — |
| kJ | — | 7 | 23 | 58 | 2 | 15 | — | — | — | 1 | — | 2 | 11 | 2 | 2 | — | — | 2 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | N 6 | — | — | NNW 5 | — | — | WNW 4 | WSW 4 | — | — | WNW 4 | — | — | — | — | — | — |
| kJ | — | — | — | — | 23 | — | — | 8 | — | — | 1 | 4 | — | — | 11 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 17 | 87 | 12 | 1 | 108 | 2 | 1 | 53 | 17 | 1 | 796 | 530 | 535 | 47 | 17 | 1 | 534 | 1 | 1 | 563 | 17 |
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