Surf Forecasts:
Guethary - Les Alcyons/Avalanche surf forecast from 13 Jul 2026:
- Best quality surf: Monday 13 Jul, 11AM (local time) - 4.5ft (1.3m), 7s period, WNW swell with glassy winds.
- Most powerful swell: Monday 13 Jul, 8AM (local time) - 4.5ft (1.3m), 6s period, WNW swell with 145 kJ wave energy.
- Next surfable swell (1★+): Monday 13 Jul, 11AM (local time) - 4.5ft (1.3m), 7s 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 Monday (Jul 13) at 11AM. The primary swell is predicted to be 1.3m and 7s 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 1.3m 6s and forecast to arrive on Monday (Jul 13) at 8AM. 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+) | 11AM (Mon 13th Jul) | 4.5ft (1.3m) 7s |
| Best Surf | 11AM (Mon 13th Jul) | 4.5ft (1.3m) 7s |
| Most Powerful | 8AM (Mon 13th Jul) | 4.5ft (1.3m) 6s |
Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.
Alright, let’s talk about what’s happening at Guethary – Les Alcyons/Avalanche. This is a heavy reef setup that’s strictly for experts, and consistent as they come, but the next couple of weeks look pretty grim for the most part. The water is a whopping 77°, which is a full 8° above normal for this time of year – that’s really unusual, and it’ll feel like a warm bath.
The only half-decent window in the near term is Monday morning, July 13. We’ve got a 4ft swell out of the WNW, period a short 7 seconds, with glassy conditions – NNW wind at 3 mph. The combined energy is weak at 134, so it’s surfable but very ordinary. Expect small, gutless waves and a fair bit of waiting. That window closes fast, and from Monday afternoon all the way through to Sunday, July 27, it’s a total write-off – every session scores a zero. Poor surf, choppy onshore wind, or just flat.
Then we get a real standout – Tuesday morning, July 28. That’s over two weeks away, so take it with a grain of salt, but the models are showing a 5ft swell from the NW, period 8 seconds, and absolutely glassy calm – NNE wind at 0 mph. The combined energy jumps to 372, a moderate pulse. That’ll clean up the reef nicely. The swell direction is slightly off the optimum W, but close enough to wrap in well. Later that afternoon the swell bumps to 6ft, but the wind swings cross-onshore NNW at 6 mph, making it choppy and marginal. The morning session is the one to aim for – but it’s an expert-only wave, and crowds are often heavy here, so get there early.
Overall, the only two windows are Monday morning the 13th and Tuesday morning the 28th. The 28th is the better bet if you can wait.
Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Tue afternoon, min 19°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Fri morning. Warm (max 23°C on Sat afternoon, min 18°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | |||||||||||||||
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) | WNW 7 | WNW 6 | WNW 6 | NNW 8 | NNW 5 | WNW 11 | NW 5 | NW 5 | NW 5 | NW 5 | NW 6 | NW 6 | NNW 5 | NNW 5 | NNW 5 | WNW 8 | WNW 8 | WNW 9 | WNW 8 | WNW 8 | N 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 134 | 74 | 20 | 6 | 7 | 12 | 21 | 25 | 20 | 17 | 31 | 32 | 26 | 16 | 8 | 6 | 7 | 8 | 7 | 13 | 23 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross | glassy | on | cross-on | cross-on | on | cross-off | cross-on | on | cross-on | cross-on | on | glassy | glassy | cross-on | cross | glassy | on | glassy |
High Tide | 4:31PM3.75m | 5:04AM3.66m | 5:23PM3.96m | 5:55AM3.75m | 6:12PM4.09m | 6:42AM3.77m | 6:59PM4.11m | 7:28AM3.70m | 7:45PM4.02m | 8:13AM3.57m | 8:30PM3.83m | 8:57AM3.39m | 9:15PM3.56m | ||||||||
Low Tide | 10:08AM0.42m | 10:41PM0.15m | 11:00AM0.25m | 11:33PM-0.02m | 11:49AM0.14m | 00:22AM-0.09m | 12:35PM0.09m | 1:09AM-0.07m | 1:21PM0.14m | 1:55AM0.06m | 2:06PM0.27m | 2:40AM0.26m | 2:52PM0.47m | 3:25AM0.51m | |||||||
 | |  |  | | | | | | | | |  | | | | |  | | | | |
 | 6:37 | — | — | 6:37 | — | — | 6:39 | — | — | 6:39 | — | — | 6:39 | — | — | 6:41 | — | — | 6:41 | — | — |
 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:44 | — | — | 9:43 | — | — | 9:42 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — |
Temp °C | 21 | 23 | 22 | 23 | 26 | 23 | 22 | 23 | 22 | 21 | 22 | 22 | 20 | 22 | 21 | 21 | 23 | 22 | 22 | 25 | 24 |
Feels °C | 23 | 24 | 23 | 25 | 27 | 22 | 23 | 24 | 23 | 21 | 22 | 22 | 21 | 22 | 22 | 22 | 23 | 23 | 24 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | WNW 7 | WNW 6 | WNW 6 | NNW 5 | WNW 5 | NNW 4 | WNW 10 | NW 5 | NW 5 | NW 5 | WNW 9 | NW 6 | NNW 5 | WNW 9 | NNW 5 | WNW 8 | WNW 5 | NNW 4 | NNW 4 | WNW 8 | N 5 |
| kJ | 134 | 74 | 20 | 5 | 2 | 10 | 10 | 25 | 20 | 17 | 8 | 32 | 26 | 8 | 8 | 6 | 3 | 3 | 3 | 13 | 23 |
Swell 2 Height (m) Direction Period (s) | — | NW 8 | NNW 6 | WNW 5 | NW 7 | WNW 11 | — | WNW 10 | WNW 9 | WNW 9 | — | WNW 8 | WNW 9 | — | WNW 5 | NNW 4 | WNW 8 | WNW 9 | WNW 8 | — | WNW 8 |
| kJ | — | 11 | 10 | 5 | 2 | 12 | — | 19 | 8 | 8 | — | 14 | 8 | — | 3 | 2 | 7 | 8 | 7 | — | 6 |
Swell 3 Height (m) Direction Period (s) | — | — | NW 8 | NNW 8 | W 12 | W 8 | W 7 | W 7 | W 7 | — | — | — | — | — | WNW 8 | WNW 4 | N 6 | W 5 | NW 10 | — | NW 9 |
| kJ | — | — | 10 | 6 | 3 | 1 | 1 | 1 | 1 | — | — | — | — | — | 7 | 2 | 1 | 2 | 4 | — | 3 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NNW 5 | WSW 3 | NW 5 | — | — | — | NW 6 | — | — | NNW 5 | — | — | NNW 4 | — | — | NNW 4 | — |
| kJ | — | — | — | — | 7 | 3 | 21 | — | — | — | 31 | — | — | 16 | — | — | 2 | — | — | 4 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 356 | 72 | 388 | 433 | 490 | 490 | 490 | 414 | 287 | 612 | 414 | 610 | 620 | 578 | 620 | 1041 | 698 | 580 | 628 | 56 |
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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