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, 11PM (local time) - 8ft (2.5m), 8s period, WNW swell with 811 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 2.5m 8s and forecast to arrive on Saturday (Jul 25) at 11PM. 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+) | 11PM (Mon 27th Jul) | 4.5ft (1.4m) 10s |
| Best Surf | 11PM (Mon 27th Jul) | 4.5ft (1.4m) 10s |
| Most Powerful | 11PM (Sat 25th Jul) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
The Lowdown
G’day, Rusty here. Alright, let’s look at what’s on offer for the next couple of weeks. It’s a pretty quiet patch for the most part, with a few windows that might get the heart pumping a little.
The first real chance of anything decent doesn’t arrive until Monday morning, the 27th of July. Before that, we’re looking at a flat spell with small, weak swell and messy winds. The water is sitting at 77°F, which is much warmer than normal for this time of year, so at least you won’t need a thick wetsuit.
The standout of the whole forecast is Tuesday morning, the 28th of July at Guethary - Les Alcyons/Avalanche. This is a reef break, best for expert surfers, and it’s consistent. The wind is forecast to be light easterly and glassy, which is a major positive for clean conditions. We’ll see a 4ft NW swell, with a period of 10 seconds, giving it a bit of push. The combined energy is moderate at 273. It’s not a monster, but for this stretch, it’s the cleanest, most organised wave on offer. The swell direction from the NW is right on the optimum for this spot.
From there, it’s mostly a waiting game. The next half-decent look is Sunday morning, the 2nd of August. We’ve got a 5ft NW swell with a 304 combined energy, and a light ESE cross-offshore wind, which should keep the faces clean. It’s a step up in size, but still manageable for the experts this spot is made for.
The rest of the period is filled with small, weak swells, mostly under 3ft, and often onshore or cross-onshore winds that chop things up. The gap between the 28th and the 2nd of August is a long stretch of poor conditions. The energy is low, and the wind just won’t play ball. If you’re a kite surfer, the stronger afternoon winds on the 25th and 26th of July might look interesting, but for a paddle surfer, it’s a quiet month.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Sat night. Warm (max 25°C on Thu afternoon, min 19°C on Fri morning). Winds increasing (calm on Fri morning, fresh winds from the W by Sat afternoon). | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Sun night. Warm (max 34°C on Tue afternoon, min 16°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Thu 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | ||||||||||||||
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 5 | NNW 6 | NNW 5 | WNW 6 | WNW 7 | WNW 8 | NW 8 | NW 8 | NW 7 | NW 7 | NW 11 | NW 10 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | WNW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 25 | 29 | 24 | 16 | 188 | 277 | 706 | 717 | 435 | 239 | 164 | 445 | 416 | 341 | 273 | 240 | 170 | 186 | 76 | 87 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | glassy | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | on | cross-on | off | glassy | cross-on | cross | cross-on | on | cross |
High Tide | 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 | |||||||
 |  | | |  |  | |  |  | |  |  | | | | | | | | | |
 | — | — | 6:47 | — | — | 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 | — | — | — | — | — | — | — | 4 | 1 | — | 4 | 1 | — | — | — | — | — | — | — | — |
Temp °C | 25 | 24 | 25 | 24 | 22 | 21 | 22 | 21 | 21 | 22 | 21 | 21 | 21 | 21 | 25 | 34 | 33 | 25 | 28 | 23 |
Feels °C | 26 | 24 | 25 | 22 | 21 | 18 | 18 | 18 | 19 | 20 | 20 | 22 | 21 | 21 | 25 | 32 | 33 | 26 | 29 | 23 |
Swell 1 Height (m) Direction Period (s) | NNW 6 | NNW 5 | NNW 6 | NNW 5 | — | — | — | — | — | NW 12 | NW 7 | NW 11 | NW 10 | NW 10 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | NW 9 |
| kJ | 25 | 29 | 24 | 16 | — | — | — | — | — | 6 | 164 | 445 | 416 | 341 | 273 | 240 | 170 | 186 | 76 | 74 |
Swell 2 Height (m) Direction Period (s) | WNW 9 | WNW 9 | NW 9 | WNW 9 | — | — | — | — | — | — | NW 11 | — | — | — | — | — | — | — | — | WNW 11 |
| kJ | 8 | 8 | 3 | 8 | — | — | — | — | — | — | 33 | — | — | — | — | — | — | — | — | 11 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | WNW 3 | WNW 6 | WNW 7 | WNW 8 | NW 8 | NW 8 | NW 7 | — | — | — | — | — | — | — | — | WNW 5 | WNW 6 |
| kJ | — | — | — | 3 | 188 | 277 | 706 | 717 | 435 | 239 | — | — | — | — | — | — | — | — | 34 | 87 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 197 | 31 | 537 | 911 | 12 | 273 | 304 | 147 | 147 | 625 | 12 | 12 | 87 | 0 | 0 | 11 | 12 | 12 | 87 | 13 |
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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