Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 29 Jul 2026:
- Most powerful swell: Thursday 30 Jul, 2AM (local time) - 2.5ft (0.8m), 9s period, NW swell with 93 kJ wave energy.
Best Forecast Surf Conditions for Guethary - Les Alcyons/Avalanche this week:
The most powerful waves expected at Guethary - Les Alcyons/Avalanche in the next 16 days are 0.8m 9s and forecast to arrive on Thursday (Jul 30) at 2AM. 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+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Thu 30th Jul) | 2.5ft (0.8m) 9s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
The Lowdown
Alright, same story, just in feet and degrees. Only one place is on the cards — Les Alcyons/Avalanche at Guethary. It’s a reef, expert territory, wide open to west swell. The trouble is, over this full 16-day stretch, it’s pretty much dead. A few tiny bumps try to show, but the wind kills any chance of decent surf.
From July 30th all the way to August 14th, there’s nothing worth getting wet for. Swell sizes range from about 0.7ft to a rare 4ft, but with combined wave energy mostly under 100 — a couple of weak pulses hit 158 but those are blown out by onshore wind. The wind is almost always coming onshore from the NW or WNW. One glassy morning on August 4th offers no hope with only 1ft of energy. Even the largest swell on August 9th morning (4ft, WNW) is wrecked by onshore breeze.
For this break, with all the wind and minimal, weak swell, it’s more of a kite-surfing setup than a paddle-surfing one. For us, it’s a dead run. Things could turn around, but right now, don’t bother suiting up.
Rusty
Short Range ForecastMostly dry. Warm (max 22°C on Wed night, min 19°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Sun afternoon, min 18°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | ||||||||||||||
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 9 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 | NNW 6 | NNW 6 | NW 6 | NW 6 | NW 6 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | WNW 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 93 | 57 | 86 | 69 | 66 | 32 | 46 | 63 | 56 | 24 | 22 | 33 | 38 | 15 | 19 | 17 | 16 | 25 | 11 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | cross-on | on | on | on | cross-on | on | cross | on | cross-on | cross-on | cross-on | on | cross-off | glassy | cross-on | cross |
High Tide | 5:57AM3.36m | 6:10PM3.65m | 6:29AM3.42m | 6:42PM3.71m | 7:01AM3.45m | 7:14PM3.71m | 7:33AM3.44m | 7:47PM3.66m | 8:08AM3.39m | 8:23PM3.55m | 8:46AM3.30m | 9:03PM3.40m | |||||||
Low Tide | 11:45PM0.45m | 11:53AM0.47m | 00:19AM0.35m | 12:26PM0.39m | 00:52AM0.31m | 12:59PM0.37m | 1:25AM0.31m | 1:33PM0.40m | 1:59AM0.36m | 2:09PM0.48m | 2:36AM0.46m | 2:49PM0.60m | 3:18AM0.62m | ||||||
 |  | |  | | | | | |  | | | | |  | | | | | |
 | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — |
 | 9:31 | — | — | 9:30 | — | — | 9:30 | — | — | 9:29 | — | — | 9:28 | — | — | 9:27 | — | — | 9:24 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 21 | 22 | 21 | 20 | 22 | 21 | 20 | 22 | 21 | 22 | 23 | 22 | 21 | 23 | 22 | 22 | 23 | 22 |
Feels °C | 22 | 22 | 23 | 21 | 21 | 22 | 21 | 21 | 22 | 21 | 23 | 22 | 21 | 22 | 24 | 23 | 23 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | NW 9 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 8 | NW 7 | NNW 6 | NNW 6 | NW 6 | NW 6 | NW 6 | WNW 10 | NW 5 | NW 5 | NNW 5 | NNW 5 |
| kJ | 93 | 57 | 86 | 69 | 66 | 32 | 46 | 63 | 56 | 24 | 22 | 33 | 38 | 15 | 19 | 13 | 12 | 9 | 11 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | NW 9 | N 6 | WNW 10 | NW 7 | WNW 9 | NW 7 | WNW 9 | WNW 10 | — | WNW 9 | WNW 9 | WNW 9 | WNW 7 |
| kJ | — | — | — | — | — | — | 3 | 6 | 10 | 14 | 16 | 7 | 8 | 10 | — | 17 | 16 | 25 | 9 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | W 12 | W 9 | W 9 | WNW 9 | NW 7 | WNW 9 | W 11 | — | — | NW 8 | NNW 7 | NNW 7 | WNW 9 |
| kJ | — | — | — | — | — | — | 3 | 6 | 1 | 16 | 8 | 8 | 2 | — | — | 2 | 5 | 5 | 8 |
Wind waves Height (m) Direction Period (s) | WNW 4 | WNW 4 | — | — | — | NNW 4 | — | — | — | — | — | — | — | — | NW 5 | — | — | — | — |
| kJ | 9 | 8 | — | — | — | 3 | — | — | — | — | — | — | — | — | 12 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 91 | 196 | 87 | 43 | 31 | 620 | 197 | 31 | 87 | 17 | 31 | 583 | 31 | 347 | 583 | 345 | 21 | 606 | 493 |
Best forecast wave conditions in La Cote Basque | |||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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