Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 30 Jul 2026:
- Most powerful swell: Friday 31 Jul, 2AM (local time) - 2.5ft (0.7m), 8s period, NW swell with 72 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 0.7m 8s and forecast to arrive on Friday (Jul 31) at 2AM. Winds are predicted to be 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 (Fri 31st Jul) | 2.5ft (0.7m) 8s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the menu for the Basque Coast. We’re going to be talking about one spot, and honestly, it’s a tough one. The whole 16-day window is a tough slog.
Right off the bat, I’ll tell you the bad news: there isn’t a single day in this forecast that offers decent surf. The swell is tiny, the wind is mostly onshore or cross-onshore, and the energy is just plain weak. We’re looking at a full 16-day dry spell, from the 31st of July all the way through to the 15th of August.
The only break on the cards is Guethary - Les Alcyons/Avalanche, a reef setup that only an expert should even look at. It’s consistent, but that doesn’t help when there’s nothing to ride. The water temp is about average for the time of year, nothing unusual there.
We start on Friday the 31st with a tiny 2ft W/NW swell, but the wind is howling onshore from the NW at 6 to 9 mph. Combined energy is a paltry 48 to 53. It’s a mess. Saturday the 1st of August is a little better with a cross-on breeze, but the swell drops to 2ft, still poor. Sunday the 2nd morning goes glassy, which is a tease, but with only 2ft of 6-second period NW slop, it’s barely a ripple. The energy is only 58. That’s the story for the whole run: a few glassy mornings like Monday the 5th, Wednesday the 6th, and Saturday the 9th, but the swell never gets above 3ft, and the period is mostly short, below 8 seconds. The energy stays in the low double digits, struggling to hit 100. On the 6th of August we get a 0.7ft W/NW swell with an 11-second period, but that’s so small it’s not even a wave. The wind is onshore by the afternoon anyway.
By the second week, it’s more of the same. The 15th of August is the last day in the forecast, with a 1ft NW swell, dead calm wind, and a combined energy of only 11. It’s completely flat.
This is a total bust. For a spot that’s normally consistent, this kind of blank run is a bummer. The only thing that’s even a little interesting is that the swell direction is mostly from the W/NW, which is the optimum direction for this reef, but the size just isn’t there. Honestly, the setup is so weak and the wind is so often onshore, that if you’ve got a kite, you might find something to do, but for a surfboard, there’s nothing. Forecasts can change, but right now, put the board away.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Sun afternoon, min 17°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Mon afternoon. Warm (max 24°C on Wed afternoon, min 18°C on Tue morning). Wind will be generally light. | ||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | ||||||||||||||
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 8 | WNW 8 | NW 8 | NW 8 | NW 8 | NW 7 | NNW 6 | NW 6 | NNW 6 | NW 6 | WNW 10 | NW 5 | NW 5 | WNW 9 | WNW 9 | WNW 9 | WNW 8 | WNW 8 | WNW 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 72 | 45 | 53 | 28 | 31 | 64 | 25 | 25 | 29 | 38 | 19 | 26 | 18 | 16 | 16 | 26 | 22 | 22 | 12 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | glassy | cross-on | on | glassy | glassy | on | cross | cross-on | on | cross | cross-on | on | cross-off | glassy | cross-on | cross-on |
High Tide | 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 | 9:30AM3.18m | 9:53PM3.21m | |||||||
Low Tide | 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 | 3:37PM0.76m | 4:09AM0.80m | ||||||
 | | |  | |  |  | | | |  |  | | | | | | |  | |
 | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — |
 | 9:30 | — | — | 9:30 | — | — | 9:29 | — | — | 9:28 | — | — | 9:27 | — | — | 9:24 | — | — | 9:23 |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 1 |
Temp °C | 21 | 21 | 22 | 21 | 20 | 21 | 21 | 21 | 23 | 22 | 21 | 22 | 21 | 21 | 23 | 22 | 21 | 24 | 22 |
Feels °C | 22 | 22 | 22 | 22 | 21 | 20 | 21 | 21 | 23 | 21 | 21 | 22 | 22 | 22 | 24 | 22 | 22 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | NW 8 | WNW 8 | NW 8 | NW 8 | NNW 6 | NW 7 | NNW 6 | NW 6 | NNW 6 | NW 6 | NNW 5 | WNW 10 | NW 5 | NW 5 | NW 4 | NW 5 | WNW 8 | WNW 8 | N 4 |
| kJ | 72 | 45 | 53 | 28 | 21 | 64 | 25 | 25 | 29 | 38 | 6 | 19 | 14 | 8 | 5 | 7 | 22 | 22 | 9 |
Swell 2 Height (m) Direction Period (s) | — | NNW 4 | — | N 4 | NW 8 | WNW 10 | NW 7 | N 6 | NW 7 | WNW 9 | WNW 10 | NNW 7 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | NNW 5 | N 7 | WNW 8 |
| kJ | — | 3 | — | 3 | 31 | 10 | 14 | 17 | 8 | 8 | 19 | 5 | 18 | 16 | 16 | 26 | 4 | 1 | 12 |
Swell 3 Height (m) Direction Period (s) | — | — | — | NW 9 | W 9 | W 9 | WNW 9 | WNW 9 | WNW 9 | W 11 | NNW 7 | — | NNW 7 | NNW 7 | NNW 7 | NW 7 | N 6 | — | WNW 10 |
| kJ | — | — | — | 3 | 6 | 6 | 16 | 16 | 8 | 2 | 5 | — | 5 | 5 | 5 | 2 | 1 | — | 10 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | WNW 4 | NW 5 | — | — | — | — | — | NNW 4 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 12 | 26 | — | — | — | — | — | 3 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 31 | 480 | 356 | 21 | 31 | 197 | 1 | 1 | 619 | 31 | 452 | 582 | 485 | 347 | 567 | 21 | 21 | 490 | 501 |
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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