Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 8 Jul 2026:
- Best quality surf: Friday 10 Jul, 8PM (local time) - 2.5ft (0.8m), 10s period, WNW swell with glassy winds.
- Most powerful swell: Friday 10 Jul, 8PM (local time) - 2.5ft (0.8m), 10s period, WNW swell with 117 kJ wave energy.
- Next surfable swell (1★+): Friday 10 Jul, 8PM (local time) - 2.5ft (0.8m), 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 (Jul 10) at 8PM. The primary swell is predicted to be 0.8m and 10s period. The wind is predicted to be glassy 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 Friday (Jul 10) at 8PM. Winds are predicted to be glassy at the time the swell arrives.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Fri 10th Jul) | 2.5ft (0.8m) 10s |
| Best Surf | 8PM (Fri 10th Jul) | 2.5ft (0.8m) 10s |
| Most Powerful | 8PM (Fri 10th Jul) | 2.5ft (0.8m) 10s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Alright folks, Rusty here. Let’s have a look at what’s coming down the line for this spot.
Right off the bat, I gotta be straight with you – this is a tough one. We’re looking at Guethary - Les Alcyons/Avalanche, a reef setup that needs an expert touch, and it’s a consistent wave when it’s on. But for the next 16 days, it’s not really on. The combined swell energy is weak, barely cracking 100 (85) all the way through, and the forecast just keeps saying “poor surf conditions.” The water temp is about average for the time of year, so you won’t get any surprises there, but you won’t get many waves either.
The first real chance doesn’t show up until Monday, July 20th in the morning. That’s over a week and a half of flat, useless conditions. On that Monday, we see a slight bump to 4ft from the NW with a short period of 5 seconds. The wind is a light cross-onshore, so it’ll be a bit rippled. The combined energy (80) is still weak. It’s not great, but it’s the best of a bad lot. This is more of a kite-surfing vibe than a paddle session, honestly.
The afternoon of Tuesday, July 21st sees a tiny improvement, with the combined energy just creeping into moderate territory (111). Swell is 4ft from the NW, still a short 7-second period, but the wind is onshore. It’s not clean, but if you’re desperate, the energy is there.
Honestly, that’s the pick of the bunch. The rest of the window is a total write-off. Swells barely reach 3ft, periods are all over the place, and the wind is never really your friend. The 16-day forecast is a dead zone.
For a consistent reef like this, it’s a real bummer. But it happens. Forecasts change, and it’s a reliable spot – it’ll come good again. For now, I’d say leave the boards in the car and go for a walk.
Rusty.
Short Range ForecastMostly dry. Warm (max 33°C on Sat afternoon, min 19°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 36°C on Sun afternoon, min 20°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wed 15 | |||||||||||||||
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) | NW 10 | WNW 10 | NW 10 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | NW 11 | NW 10 | WNW 10 | WNW 9 | NW 9 | NW 6 | NW 7 | WNW 6 | NW 8 | NNW 8 | WNW 11 | NW 4 | WNW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 53 | 85 | 94 | 78 | 56 | 76 | 106 | 49 | 60 | 51 | 61 | 55 | 39 | 40 | 71 | 34 | 9 | 7 | 12 | 5 | 10 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | on | cross-on | on | cross | cross | glassy | cross-on | glassy | glassy | glassy | cross-on | cross-on | on | cross-on | glassy | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | 4:31PM3.75m | 5:04AM3.66m | 5:23PM3.96m | 5:55AM3.75m | 6:12PM4.09m | |||||||
Low Tide | 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 | 10:41PM0.15m | 11:00AM0.25m | 11:33PM-0.02m | 11:49AM0.14m | ||||||||
 | | |  |  | | | | |  | | | |  | | | | |  | | | |
 | — | 6:33 | — | — | 6:35 | — | — | 6:35 | — | — | 6:35 | — | — | 6:37 | — | — | 6:37 | — | — | 6:39 | — |
 | 9:49 | — | — | 9:47 | — | — | 9:47 | — | — | 9:46 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | 9:45 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 23 | 25 | 23 | 23 | 25 | 23 | 27 | 33 | 29 | 31 | 36 | 25 | 23 | 25 | 22 | 22 | 23 | 22 | 22 | 24 |
Feels °C | 22 | 26 | 26 | 25 | 25 | 27 | 26 | 28 | 31 | 30 | 30 | 35 | 27 | 25 | 25 | 22 | 24 | 23 | 22 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | NW 10 | WNW 10 | NW 10 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 8 | NW 10 | WNW 10 | WNW 9 | NW 9 | NW 6 | NW 7 | WNW 6 | NNW 4 | WNW 5 | NNW 4 | NW 4 | NNW 4 |
| kJ | 53 | 85 | 94 | 78 | 56 | 76 | 106 | 49 | 39 | 51 | 61 | 55 | 37 | 40 | 71 | 34 | 7 | 6 | 6 | 4 | 7 |
Swell 2 Height (m) Direction Period (s) | NW 4 | — | — | NW 3 | WNW 4 | NW 4 | NW 13 | NW 4 | NW 11 | NNW 5 | NNW 5 | — | — | NW 9 | NW 8 | N 4 | WNW 6 | NNW 8 | WNW 7 | WNW 7 | WNW 10 |
| kJ | 5 | — | — | 2 | 7 | 7 | 7 | 6 | 60 | 9 | 4 | — | — | 28 | 18 | 6 | 6 | 6 | 10 | 5 | 10 |
Swell 3 Height (m) Direction Period (s) | W 7 | — | — | WNW 6 | NNW 5 | — | — | NW 12 | — | WNW 8 | — | — | — | — | — | NW 8 | NW 8 | NW 12 | WNW 11 | NW 10 | WNW 7 |
| kJ | 1 | — | — | 3 | 4 | — | — | 37 | — | 27 | — | — | — | — | — | 10 | 9 | 6 | 12 | 4 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NNW 4 | — | — | NNW 3 | WNW 5 | — | — | — | — | NNW 4 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 7 | — | — | 1 | 39 | — | — | — | — | 7 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 1 | 87 | 162 | 2 | 1 | 13 | 1 | 87 | 1 | 1 | 1 | 31 | 12 | 356 | 274 | 347 | 583 | 493 | 490 | 560 |
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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