Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 6 Jul 2026:
- Best quality surf: Saturday 11 Jul, 2AM (local time) - 2.5ft (0.7m), 9s period, NW swell with cross-offshore winds.
- Most powerful swell: Sunday 12 Jul, 2AM (local time) - 2.5ft (0.8m), 10s period, NW swell with 144 kJ wave energy.
- Next surfable swell (1★+): Saturday 11 Jul, 2AM (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 2AM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.2m and 13s. 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 0.8m 10s and forecast to arrive on Sunday (Jul 12) at 2AM. Winds are predicted to be offshore at the time the swell arrives.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sat 11th Jul) | 2.5ft (0.7m) 9s |
| Best Surf | 2AM (Sat 11th Jul) | 2.5ft (0.7m) 9s |
| Most Powerful | 2AM (Sun 12th Jul) | 2.5ft (0.8m) 10s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Updates in hr min s Forecast update imminent
What's up, Rusty here.
Alright, let's talk about the next couple of weeks. It's a long stretch of small, weak, and generally messy surf. The water's running way warmer than normal for this time of year, about 24°, which is 4° above average – that's a real oddity and you'll notice it immediately.
Kicking off on Monday the 6th, it's a total dud. A tiny 2ft NW swell with a combined energy of only 55, and a cross-onshore breeze from the NNE. Just poor. Tuesday the 7th and Wednesday the 8th are no better – the swell stays under 2ft, winds are onshore or cross-onshore, and the energy level is pathetic, bouncing between 33 and 47. Thursday the 9th is more of the same, a little more energy but still poor and choppy.
Friday morning the 10th teases with glassy conditions and a light NNW wind, but on a tiny 2ft NW swell. The energy is still low at 70. Not worth getting wet for. The next few days through to mid-week the following week see a slight bump in energy, but the wave height stays under 3ft and the wind is never right. Saturday the 11th morning has some clean-looking conditions with a cross-offshore breeze from the ENE and a 2ft NW swell, and the energy climbs to 136, but it's just not enough to be worth the drive.
The one real highlight, and the only time this spot looks worth paddling out for, is on the 19th of July. That Sunday morning, we've got a clean 4ft swell from the NW, combined energy hitting a solid 231, and glassy winds from the NE. The swell period is a short 8 seconds though, so it'll break a bit soft and crumbly. But for this expert reef break, Guethary - Les Alcyons/Avalanche, that's the best on offer. After that, the following days see a bit more size but the wind turns cross-onshore and it gets messy again.
To be honest, for the next two weeks, you're looking at a lot of time on the beach. The only session with any serious promise is that Sunday the 19th morning. It's a long way out, so keep an eye on the forecast, but if the glassy conditions stick, that's your window.
Rusty.
Short Range ForecastMostly dry. Warm (max 37°C on Mon afternoon, min 19°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 33°C on Sat afternoon, min 20°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Mon 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | NW 9 | NW 9 | NW 8 | WNW 8 | WNW 5 | WNW 5 | NW 10 | NW 10 | WNW 10 | WNW 10 | WNW 9 | NW 9 | NW 9 | NW 9 | NW 12 | NW 11 | NW 10 | NW 10 | NW 9 | NW 9 | WNW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 51 | 38 | 35 | 28 | 24 | 20 | 26 | 53 | 64 | 81 | 110 | 67 | 86 | 84 | 72 | 97 | 144 | 113 | 83 | 62 | 88 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | on | cross-on | cross-off | cross-on | on | cross | on | on | cross-on | glassy | cross-on | cross-off | cross-off | cross-on | off | glassy | cross-on | cross-on | glassy |
High Tide | 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 | 2:32PM3.26m | 3:07AM3.32m | 3:34PM3.50m | 4:09AM3.50m | ||||||||
Low Tide | 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 | 8:08AM0.76m | 8:43PM0.63m | 9:11AM0.60m | 9:45PM0.39m | 10:08AM0.42m | |||||||
 |  | | | | |  | | | |  | | | | | | | | | | | |
 | — | — | 6:31 | — | — | 6:33 | — | — | 6:33 | — | — | 6:35 | — | — | 6:35 | — | — | 6:35 | — | — | 6:37 |
 | — | 9:49 | — | — | 9:49 | — | — | 9:49 | — | — | 9:47 | — | — | 9:47 | — | — | 9:46 | — | — | 9:46 | 9:45 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 37 | 35 | 25 | 25 | 22 | 21 | 23 | 22 | 21 | 24 | 23 | 23 | 25 | 24 | 27 | 33 | 28 | 33 | 36 | 22 | 21 |
Feels °C | 34 | 33 | 25 | 26 | 23 | 22 | 25 | 23 | 23 | 26 | 24 | 25 | 27 | 26 | 27 | 32 | 30 | 32 | 34 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | NW 9 | NW 9 | NW 8 | WNW 8 | WNW 5 | WNW 5 | WNW 5 | NW 10 | WNW 10 | WNW 10 | WNW 9 | NW 9 | NW 9 | NW 9 | WNW 8 | NW 11 | NW 10 | NW 10 | NW 9 | NW 9 | WNW 6 |
| kJ | 51 | 38 | 35 | 28 | 24 | 20 | 15 | 53 | 64 | 81 | 110 | 67 | 86 | 84 | 64 | 97 | 144 | 113 | 83 | 62 | 88 |
Swell 2 Height (m) Direction Period (s) | — | NNW 4 | WNW 4 | N 4 | NW 8 | WNW 8 | NW 10 | W 7 | WNW 4 | NW 4 | — | WNW 4 | — | WNW 13 | NW 12 | WNW 8 | — | — | — | N 5 | NW 8 |
| kJ | — | 6 | 3 | 1 | 17 | 7 | 26 | 1 | 4 | 4 | — | 3 | — | 18 | 72 | 45 | — | — | — | 18 | 25 |
Swell 3 Height (m) Direction Period (s) | — | — | N 4 | NW 5 | NW 12 | WNW 11 | WNW 8 | — | NNW 4 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 3 | 1 | 5 | 11 | 6 | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 5 | — | — | WNW 4 | — | — | — | WNW 4 | — | — | — | — | — | — | — | — | — | — | — | W 4 | — |
| kJ | 4 | — | — | 3 | — | — | — | 8 | — | — | — | — | — | — | — | — | — | — | — | 40 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 6 | 26 | 31 | 796 | 1 | 451 | 333 | 17 | 189 | 87 | 35 | 1 | 87 | 0 | 0 | 47 | 0 | 0 | 606 | 47 | 0 |
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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