Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 23 Jul 2026:
- Best quality surf: Monday 27 Jul, 11PM (local time) - 4.5ft (1.4m), 10s period, NW swell with glassy winds.
- Most powerful swell: Saturday 25 Jul, 5PM (local time) - 7ft (2.2m), 7s period, WNW swell with 528 kJ wave energy.
- Next surfable swell (1★+): Monday 27 Jul, 11PM (local time) - 4.5ft (1.4m), 10s 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 Monday (Jul 27) at 11PM. The primary swell is predicted to be 1.4m 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 2.2m 7s and forecast to arrive on Saturday (Jul 25) at 5PM. 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+) | 11PM (Mon 27th Jul) | 4.5ft (1.4m) 10s |
| Best Surf | 11PM (Mon 27th Jul) | 4.5ft (1.4m) 10s |
| Most Powerful | 5PM (Sat 25th Jul) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
The Lowdown
Alright folks, Rusty here. Gotta be straight with you – it's a tough outlook for our region. We're looking at a long stretch of very poor conditions, so you'll want to pick your moments carefully.
The water temperature is sitting at a very unusual 77.4°F, which is nearly 7° warmer than normal for this time of year. At Guethary - Les Alcyons/Avalanche, that's a real oddity.
Right now, starting Thursday the 23rd, it's a write-off. Cross-on winds are just messing up the 2.0 ft to 2.3 ft of weak, short-period swell. The energy is pathetic (45 as of the morning). Friday the 24th morning goes glassy, but the swell is a tiny 2.0 ft with only 27 energy – barely a ripple.
Then we get a pulse on Saturday the 25th. Swell builds to 5.6 ft in the morning and 7.2 ft by the afternoon from the WNW, with energy jumping to 528 by the afternoon. But here's the kicker: it's cross-onshore wind at 16 mph. The setup is a reef, but with that wind and chop, it's going to be a bumpy, blown-out mess. That kind of size with those winds is more interesting for kite surfing than paddling. Sunday the 26th is also onshore, with 5.9 ft swell but the same wind story.
The only real glimmer in this 16-day window is Tuesday morning the 28th of July. The wind goes glassy from the ENE at 3 mph. We've got a 3.9 ft NW groundswell with a period of 10 seconds and a moderate energy (284). That combo of glassy conditions and a clean, long-period swell is a major positive. This spot is an expert reef break, and with the swell coming from the optimum W direction, it should line up nicely. It won't be huge, but it'll be your cleanest window by a mile. Expect the best of a bad run.
After that, it's back to small, weak, and messy. Wednesday the 29th has glassy morning wind but only 3.0 ft at 138 energy. From the 30th right through to the 7th of August, it's mostly tiny surf under 2.6 ft with cross or onshore winds. The energy values drop into the double digits – very weak. A few glassy mornings pop up (31st July, 3rd August, 6th August), but the swell is too small to ride.
Bottom line: if you're desperate, aim for Tuesday morning the 28th of July at Guethary. Otherwise, the board stays in the car.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat night. Warm (max 25°C on Thu afternoon, min 19°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Sun night. Warm (max 30°C on Tue afternoon, min 16°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | |||||||||||||||
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) | NNW 6 | NNW 6 | NNW 5 | NNW 6 | NNW 5 | WNW 6 | WNW 7 | WNW 7 | NW 7 | NW 7 | NW 7 | NW 7 | NW 11 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 34 | 25 | 30 | 24 | 16 | 212 | 257 | 528 | 492 | 365 | 218 | 124 | 445 | 459 | 388 | 284 | 279 | 204 | 138 | 135 | 78 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-off | glassy | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | on | on | glassy | glassy | cross-on | cross | glassy | on | cross-on |
High Tide | 12:35PM2.74m | 1:13AM2.67m | 1:48PM2.75m | 2:26AM2.70m | 2:52PM2.86m | 3:24AM2.81m | 3:43PM3.02m | 4:10AM2.97m | 4:26PM3.21m | 4:49AM3.12m | 5:03PM3.39m | 5:24AM3.26m | 5:37PM3.54m | ||||||||
Low Tide | 6:43PM1.24m | 7:14AM1.27m | 7:55PM1.23m | 8:20AM1.23m | 8:57PM1.11m | 9:16AM1.10m | 9:48PM0.94m | 10:02AM0.93m | 10:31PM0.76m | 10:42AM0.75m | 11:09PM0.59m | 11:19AM0.59m | 11:45PM0.45m | ||||||||
 | |  | | |  |  |  |  |  | |  |  | | | | | | | | | |
 | 6:46 | — | — | 6:47 | — | — | 6:48 | — | — | 6:48 | — | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — |
 | — | — | 9:38 | — | — | 9:37 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 | — | — | 9:34 | — | — | 9:31 |
mm | — | — | — | — | — | — | — | — | 3 | 1 | — | 5 | 2 | — | — | — | — | — | — | — | — |
Temp °C | 23 | 25 | 23 | 25 | 25 | 22 | 21 | 23 | 21 | 21 | 22 | 21 | 21 | 22 | 20 | 23 | 30 | 28 | 27 | 32 | 26 |
Feels °C | 23 | 26 | 23 | 25 | 23 | 21 | 18 | 21 | 19 | 19 | 20 | 20 | 22 | 21 | 20 | 23 | 29 | 29 | 28 | 32 | 26 |
Swell 1 Height (m) Direction Period (s) | NNW 6 | NNW 6 | NNW 5 | NNW 6 | NNW 5 | — | — | — | — | — | NW 12 | NW 7 | NW 11 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 |
| kJ | 34 | 25 | 30 | 24 | 16 | — | — | — | — | — | 6 | 124 | 445 | 459 | 388 | 284 | 279 | 204 | 138 | 135 | 78 |
Swell 2 Height (m) Direction Period (s) | WNW 10 | WNW 9 | WNW 9 | NW 9 | WNW 9 | — | — | — | — | — | — | NW 12 | — | — | — | — | — | — | — | — | WNW 11 |
| kJ | 9 | 8 | 8 | 3 | 8 | — | — | — | — | — | — | 34 | — | — | — | — | — | — | — | — | 12 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 3 | — | — | — | WNW 3 | WNW 6 | WNW 7 | WNW 7 | NW 7 | NW 7 | NW 7 | — | — | — | — | — | — | — | — | — | W 4 |
| kJ | 2 | — | — | — | 3 | 212 | 257 | 528 | 492 | 365 | 218 | — | — | — | — | — | — | — | — | — | 8 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 189 | 197 | 31 | 537 | 1805 | 12 | 541 | 1158 | 147 | 147 | 304 | 12 | 12 | 87 | 0 | 0 | 11 | 12 | 0 | 53 | 17 |
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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