Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 11 Jul 2026:
- Best quality surf: Saturday 11 Jul, 8AM (local time) - 2.5ft (0.7m), 9s period, NW swell with cross-offshore winds.
- Most powerful swell: Sunday 12 Jul, 8PM (local time) - 3.5ft (1.1m), 9s period, WNW swell with 194 kJ wave energy.
- Next surfable swell (1★+): Saturday 11 Jul, 8AM (local time) - 2.5ft (0.7m), 9s 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 Saturday (Jul 11) at 8AM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.3m and 12s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Guethary - Les Alcyons/Avalanche in the next 16 days are 1.1m 9s and forecast to arrive on Sunday (Jul 12) at 8PM. 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 (Sat 11th Jul) | 2.5ft (0.7m) 9s |
| Best Surf | 8AM (Sat 11th Jul) | 2.5ft (0.7m) 9s |
| Most Powerful | 8PM (Sun 12th Jul) | 3.5ft (1.1m) 9s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Alright folks, Rusty here again, same story but in feet and Fahrenheit. It’s a bleak start for the next couple of weeks, but there’s a big one lurking at the very end of the forecast.
Right off the bat, from Saturday the 11th, the surf is tiny. We get a brief, glassy 0.7m (2ft) WNW swell in the morning at Guethary - Les Alcyons/Avalanche, but the energy’s low (102) and it’s gone by lunch. After that, from Sunday the 12th all the way through to Thursday the 24th of July, it’s a major drought. Surf is knee-to-waist high at best, with onshore winds and no quality. The wave energy is weak to moderate, but the conditions are just ugly. This is a long, flat, frustrating stretch.
Now, the light at the end of the tunnel is Saturday the 25th of July. A solid groundswell shows up. The morning brings a chunky 2.4m (8ft) swell from the NW, with a 13-second period. That’s a very long period and the combined energy is a massive 1863, so we’re talking serious power. This is strictly for expert surfers, as it’s over 8ft. The wind is light cross-onshore, so it won’t be perfect, but the size and grunt are the real deal. That morning is the only real standout in the whole 16-day outlook. The afternoon stays similar at 2.3m (8ft) but the wind picks up a notch. Sunday the 26th drops back to 1.6m (5ft) of leftover swell, still on the bumpy side.
The water temp is normal for this time of year. So, to wrap it up: suffer through two weeks of junk, but if you’re an expert and free on that last Saturday morning, that’s your ticket.
Rusty.
Short Range ForecastMostly dry. Warm (max 37°C on Sun afternoon, min 20°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Tue afternoon, min 19°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Fri 17 | |||||||||||||||
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 | NW 11 | NW 10 | WNW 10 | WNW 9 | WNW 5 | WNW 7 | WNW 7 | WNW 6 | NNW 8 | NNW 3 | NW 4 | WNW 10 | WNW 10 | NNW 5 | WNW 9 | WNW 9 | N 5 | N 5 | NNW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 73 | 65 | 60 | 51 | 61 | 55 | 49 | 127 | 61 | 20 | 6 | 6 | 12 | 10 | 19 | 8 | 16 | 16 | 11 | 14 | 9 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | cross | off | glassy | glassy | cross-on | on | cross-on | cross | glassy | cross-on | cross-on | on | cross-on | glassy | on | on | on | on | on |
High Tide | 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 | 7:28AM3.70m | 7:45PM4.02m | |||||||
Low Tide | 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 | 1:09AM-0.07m | 1:21PM0.14m | ||||||||
 |  | |  | | |  | | | | | | | | | | | |  |  |  | |
 | — | 6:35 | — | — | 6:35 | — | — | 6:37 | — | — | 6:37 | — | — | 6:39 | — | — | 6:39 | — | — | 6:39 | — |
 | 9:47 | — | — | 9:46 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | 9:44 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 1 |
Temp °C | 26 | 25 | 33 | 32 | 30 | 37 | 23 | 22 | 23 | 22 | 23 | 25 | 22 | 22 | 24 | 22 | 21 | 22 | 21 | 21 | 23 |
Feels °C | 25 | 27 | 30 | 31 | 30 | 36 | 23 | 24 | 24 | 23 | 26 | 26 | 22 | 23 | 25 | 23 | 22 | 23 | 22 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | WNW 9 | WNW 8 | NW 10 | WNW 10 | WNW 9 | NW 9 | WNW 7 | WNW 7 | WNW 6 | WNW 5 | NW 8 | NW 4 | NW 4 | NNW 5 | NNW 5 | NNW 5 | WNW 9 | N 5 | N 5 | WNW 9 |
| kJ | 73 | 65 | 46 | 51 | 61 | 55 | 37 | 127 | 61 | 20 | 5 | 2 | 11 | 9 | 8 | 8 | 13 | 16 | 11 | 14 | 8 |
Swell 2 Height (m) Direction Period (s) | NW 4 | NW 12 | NW 11 | N 4 | NNW 4 | N 4 | — | — | NW 9 | N 4 | N 4 | W 12 | WNW 11 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | — | WNW 9 | WNW 9 | W 6 |
| kJ | 5 | 37 | 60 | 10 | 4 | 3 | — | — | 12 | 6 | 1 | 3 | 12 | 10 | 19 | 8 | 16 | — | 8 | 8 | 1 |
Swell 3 Height (m) Direction Period (s) | NW 13 | — | — | WNW 8 | — | — | — | — | — | NW 8 | NNW 8 | W 8 | W 8 | W 7 | W 7 | NW 9 | — | — | — | — | — |
| kJ | 7 | — | — | 28 | — | — | — | — | — | 10 | 6 | 1 | 1 | 1 | 1 | 3 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | WNW 5 | — | N 4 | — | — | NNW 3 | — | — | — | — | — | N 5 | — | — | NNW 5 |
| kJ | — | — | — | — | — | — | 49 | — | 4 | — | — | 6 | — | — | — | — | — | 12 | — | — | 9 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 17 | 0 | 47 | 1 | 1 | 1 | 147 | 31 | 87 | 91 | 347 | 569 | 325 | 493 | 560 | 530 | 610 | 620 | 427 | 460 | 1041 |
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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