Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 24 Aug 2026:
- Best quality surf: Friday 28 Aug, 2AM (local time) - 5ft (1.5m), 10s period, WNW swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 8PM (local time) - 5.5ft (1.7m), 10s period, WNW swell with 573 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 2AM (local time) - 5ft (1.5m), 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 Friday (Aug 28) at 2AM. The primary swell is predicted to be 1.5m and 10s period. 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 1.7m 10s and forecast to arrive on Thursday (Aug 27) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Friday (Aug 28) at 5AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Fri 28th Aug) | 5ft (1.5m) 10s |
| Best Surf | 2AM (Fri 28th Aug) | 5ft (1.5m) 10s |
| Most Powerful | 8PM (Thu 27th Aug) | 5.5ft (1.7m) 10s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
The Lowdown
G’day, I’m Rusty, and I’ve been staring at the charts for this stretch of coast. Honestly, it’s a slow burner at Guethary - Les Alcyons/Avalanche (France). We’ve got a long wait ahead, with a real dry spell filling the first week of the forecast. The water’s sitting at 76°, which is much warmer than normal for this time of year, so at least the paddle won’t be a shock to the system.
Right now, from Monday the 24th of August, it’s pretty grim. The swell is tiny and weak, barely 1.0 ft from the north with a short, gutless period, and the combined energy is sitting at a pathetic 12. It’s just not worth getting wet. Expect a stretch of around 7 days with next to no real surf. We’ll see a few flickers of life on the 27th with a 5 ft swell from the WNW, but the wind is onshore and the energy is still moderate at 340. It’s a marginal call at best.
The real standout doesn’t roll in until Tuesday, the 1st of September. That morning, we’ve got glassy conditions with a clean 6 ft swell from the NW, a period of 10 seconds, and a solid energy reading of 535. The wind is barely a whisper from the NNE, and the break is forecast to have very good surf conditions. This is the pick of the bunch for the whole window. It’s a consistent, exposed reef, so it handles the swell well, but remember it’s an expert spot, so don’t paddle out if you’re not confident.
There’s another promising window on the 6th of September, with a glassy morning, 7 ft of NW swell, and energy at 911, which is strong. The conditions look very good again. Then on the 7th, we get a dose of long-period groundswell from the WNW at 4 ft but with a 16-second period. That’s a very long swell, and combined with a cross-off wind from the east, it’ll be clean. The energy is a thumping 996, which is strong. It’s a reef break, so those long-period lines should hold up beautifully.
The second week is a mixed bag. The 5th of September sees a big 10 ft swell from the NW, but it’s blown out by a moderate cross-onshore wind. That’s expert territory and messy. The 8th is marginal with onshore winds and a 5 ft swell. Stick to the first week’s standout on the 1st of September if you want a clean session.
Rusty.
Short Range ForecastMostly dry. Warm (max 32°C on Mon afternoon, min 18°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri night. Warm (max 27°C on Thu afternoon, min 17°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
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) | N 6 | N 5 | NW 6 | NW 13 | NW 12 | NW 11 | WNW 8 | WNW 7 | WNW 7 | WNW 8 | WNW 9 | WNW 10 | WNW 9 | WNW 7 | WNW 10 | WNW 9 | NW 9 | NW 8 | NW 8 | NW 8 | NW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 5 | 5 | 2 | 7 | 23 | 31 | 37 | 47 | 31 | 38 | 340 | 416 | 161 | 545 | 548 | 320 | 231 | 149 | 142 | 238 | 107 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | on | cross-off | cross-on | cross-on | glassy | off | cross-on | on | off | on | cross-off | cross | cross-on | cross | cross-on | cross-on | cross-off | glassy | on | cross-off |
High Tide | 3:24PM2.96m | 3:51AM2.93m | 4:05PM3.21m | 4:26AM3.14m | 4:39PM3.45m | 4:59AM3.34m | 5:10PM3.65m | 5:29AM3.50m | 5:41PM3.80m | 6:00AM3.62m | 6:13PM3.88m | 6:31AM3.68m | 6:45PM3.89m | ||||||||
Low Tide | 8:57AM1.19m | 9:30PM0.99m | 9:43AM0.95m | 10:11PM0.74m | 10:20AM0.71m | 10:46PM0.50m | 10:54AM0.49m | 11:18PM0.31m | 11:26AM0.32m | 11:50PM0.17m | 11:59AM0.21m | 00:22AM0.10m | 12:31PM0.16m | 00:54AM0.10m | |||||||
 | |  |  | | |  | |  | | | | | |  | | |  | | | | |
 | 7:20 | — | — | 7:20 | — | — | 7:22 | — | — | 7:24 | — | — | 7:24 | — | — | 7:26 | — | — | 7:26 | — | — |
 | — | 8:55 | — | — | 8:53 | — | — | 8:52 | — | — | 8:51 | — | — | 8:49 | — | — | 8:47 | — | — | 8:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — |
Temp °C | 29 | 32 | 24 | 24 | 25 | 22 | 23 | 31 | 25 | 22 | 27 | 22 | 23 | 22 | 21 | 21 | 22 | 21 | 21 | 23 | 21 |
Feels °C | 28 | 30 | 25 | 22 | 24 | 23 | 23 | 30 | 23 | 23 | 25 | 19 | 19 | 18 | 20 | 21 | 21 | 21 | 22 | 22 | 21 |
Swell 1 Height (m) Direction Period (s) | N 6 | NW 7 | — | NW 13 | NW 4 | NW 5 | WNW 8 | WNW 7 | WNW 7 | NW 5 | WNW 9 | WNW 10 | WNW 9 | WNW 12 | WNW 10 | WNW 9 | NW 9 | NW 8 | NW 8 | NW 8 | NW 7 |
| kJ | 5 | 2 | — | 7 | 5 | 6 | 37 | 47 | 31 | 20 | 340 | 416 | 161 | 172 | 548 | 320 | 231 | 149 | 142 | 238 | 107 |
Swell 2 Height (m) Direction Period (s) | NNW 7 | — | NW 6 | N 6 | NW 12 | NW 11 | NW 10 | WNW 10 | WNW 9 | WNW 8 | — | — | — | — | — | — | — | — | — | — | W 12 |
| kJ | 5 | — | 2 | 1 | 23 | 31 | 35 | 35 | 31 | 38 | — | — | — | — | — | — | — | — | — | — | 3 |
Swell 3 Height (m) Direction Period (s) | W 9 | W 9 | — | NW 9 | W 8 | W 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 2 | 2 | — | 3 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 3 | N 5 | — | W 3 | — | — | — | — | — | — | — | — | W 5 | WNW 7 | — | — | — | — | — | — | — |
| kJ | 1 | 5 | — | 2 | — | — | — | — | — | — | — | — | 71 | 545 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 224 | 222 | 350 | 356 | 388 | 21 | 1 | 43 | 224 | 1 | 47 | 0 | 12 | 403 | 2 | 12 | 87 | 0 | 0 | 87 | 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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