Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 21 Jul 2026:
- Best quality surf: Monday 27 Jul, 11PM (local time) - 4.5ft (1.3m), 10s period, NW swell with glassy winds.
- Most powerful swell: Saturday 25 Jul, 5PM (local time) - 8ft (2.5m), 7s period, WNW swell with 687 kJ wave energy.
- Next surfable swell (1★+): Monday 27 Jul, 11PM (local time) - 4.5ft (1.3m), 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 1.3m 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 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 (1.3m) 10s |
| Best Surf | 11PM (Mon 27th Jul) | 4.5ft (1.3m) 10s |
| Most Powerful | 5PM (Sat 25th Jul) | 8ft (2.5m) 7s |
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 offer for the coming weeks.
Honestly, the next little while is looking pretty grim for Guethary - Les Alcyons/Avalanche. We’re in for a tough stretch of onshore winds and tiny, weak swell that’s just not going to deliver. The first real chance of anything better doesn’t roll in until the end of the coming week, and even then, it’s a bit of a gamble.
The standout and really the only window to get excited about is shaping up for Tuesday, July 28th. The morning is looking magic with clean, glassy conditions and a light NE wind. There’s a solid 5ft groundswell from the NW, with a period of 10 seconds, giving it some proper push. The combined energy is moderate at 416, so there’s some real power in the water. This is a reef break, so that longer period will suit it nicely, offering up some well-shaped, powerful waves. It’s a spot for experts only, and with the quality on offer, it’s likely to be busy. The water is very warm, much warmer than usual for this time of year.
The next morning, Wednesday, July 29th, is also a decent option. The swell drops a touch to 5ft from the NW, still with a good 10-second period, and the wind is light and offshore from the ENE, leaving the surf clean. The energy is still solid at 363.
Before that, we get a bit of a tease on Monday, July 27th. The swell bumps up to 6ft from the NW, with a period of 9-10 seconds, which is a good sign. The combined energy is strong, hitting 508-554. But the wind is onshore, so the quality will be messy and the conditions marginal. It’s one to watch but not one to get too excited about.
After that brief window, it’s back to the struggle. The rest of the week into early August is a sea of onshore wind, small waves, and poor conditions. There’s a long gap of days with nothing worthwhile. July 31st and August 1st have a little more size, but the onshore wind kills it. August 2nd and 3rd are flat and blown out. It’s a real bummer of a run.
So, to sum it up: hold out for the morning of July 28th. That’s the one to point the car at. The rest of the 16-day window is a write-off for paddle surfing. If the wind keeps up on the 25th and 26th with that 6ft to 8ft of lumpy, cross-onshore swell, it’ll be more interesting for the kite crew than us.
Stay keen, and keep an eye on the sky. Forecasts can change.
Rusty.
Short Range ForecastMostly dry. Warm (max 30°C on Wed afternoon, min 18°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Sat night. Warm (max 26°C on Fri afternoon, min 19°C on Fri morning). Winds increasing (calm on Fri morning, fresh winds from the W by Sat afternoon). | ||||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | |||||||||||||||
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 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 | WNW 6 | WNW 7 | WNW 7 | NW 6 | NW 7 | NW 6 | NW 7 | NW 10 | NW 10 | NW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 93 | 68 | 85 | 35 | 25 | 77 | 38 | 25 | 59 | 29 | 16 | 130 | 278 | 687 | 209 | 178 | 202 | 159 | 170 | 373 | 257 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-off | cross-off | on | cross | glassy | on | cross | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-off |
High Tide | 10:31AM2.99m | 10:55PM2.98m | 11:27AM2.83m | 11:58PM2.77m | 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 | |||||||
Low Tide | 4:32PM0.94m | 5:04AM1.02m | 5:33PM1.14m | 6:05AM1.20m | 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 | ||||||||
 | |  | | | | | | | | |  |  |  |  |  |  |  | | | | |
 | 6:43 | — | — | 6:45 | — | — | 6:46 | — | — | 6:47 | — | — | 6:48 | — | — | 6:48 | — | — | 6:50 | — | — |
 | — | — | 9:39 | — | — | 9:38 | — | — | 9:38 | — | — | 9:37 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 4 | 1 | — | 5 | — | — | — |
Temp °C | 23 | 23 | 22 | 24 | 30 | 26 | 24 | 26 | 24 | 25 | 26 | 22 | 21 | 22 | 22 | 21 | 21 | 21 | 21 | 23 | 22 |
Feels °C | 23 | 21 | 20 | 22 | 27 | 26 | 24 | 26 | 24 | 25 | 25 | 21 | 17 | 18 | 20 | 19 | 19 | 20 | 21 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | NNW 7 | NNW 6 | NNW 6 | NNW 6 | WNW 10 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 5 | — | — | — | NW 10 | W 10 | NW 12 | NW 7 | NW 7 | NW 10 | NW 10 |
| kJ | 93 | 68 | 85 | 35 | 9 | 77 | 38 | 25 | 59 | 29 | 16 | — | — | — | 4 | 2 | 6 | 159 | 118 | 373 | 257 |
Swell 2 Height (m) Direction Period (s) | WNW 11 | WNW 11 | WNW 10 | WNW 10 | — | WNW 10 | WNW 10 | WNW 9 | WNW 9 | NW 9 | WNW 9 | — | — | — | — | NW 13 | — | NW 11 | NW 10 | — | — |
| kJ | 12 | 11 | 10 | 10 | — | 9 | 9 | 8 | 8 | 3 | 8 | — | — | — | — | 7 | — | 43 | 170 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NNW 6 | — | — | — | — | — | WNW 3 | WNW 6 | WNW 7 | WNW 7 | NW 6 | NW 7 | NW 6 | — | — | — | — |
| kJ | — | — | — | — | 25 | — | — | — | — | — | 4 | 130 | 278 | 687 | 209 | 178 | 202 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 54 | 87 | 17 | 1 | 197 | 17 | 7 | 583 | 17 | 436 | 911 | 304 | 599 | 619 | 313 | 304 | 496 | 12 | 12 | 87 | 0 |
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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