Guethary - Les Alcyons/Avalanche Surf Break

Lat Long: 43.43° N 1.62° W

Guethary - Les Alcyons/Avalanche Surf Forecast and Surf Report

Issued: 1 pm 01 Aug 2026 (local time)

Forecast update in  hr  min

Today's Guethary - Les Alcyons/Avalanche sea temperature is
24.7° C
3.1° 

Guethary - Les Alcyons/Avalanche surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Guethary - Les Alcyons/Avalanche surf forecast from 1 Aug 2026:

  • Best quality surf: Friday 7 Aug, 5AM (local time) - 3ft (0.9m), 8s period, NW swell with glassy winds.
  • Most powerful swell: Thursday 6 Aug, 2PM (local time) - 3.5ft (1.0m), 8s period, NW swell with 142 kJ wave energy.
  • Next surfable swell (1★+): Friday 7 Aug, 5AM (local time) - 3ft (0.9m), 8s 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 Friday (Aug 07) at 5AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.3m and 10s. 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 1.0m 8s and forecast to arrive on Thursday (Aug 06) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (CEST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Fri 7th Aug)3ft (0.9m) 8s
Best Surf 5AM (Fri 7th Aug)3ft (0.9m) 8s
Most Powerful 2PM (Thu 6th Aug)3.5ft (1.0m) 8s

Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 16 days.


The Lowdown

Alright, let’s talk about Guethary – Les Alcyons/Avalanche. The water’s at 25°C, which is much warmer than usual for this time of year – about 3°C above the average. That’s pretty noticeable.

Honestly, the next 16 days are a tough slog. There’s nothing worth paddling out for until the 14th of August. The first 13 days? All poor surf conditions. We’re looking at tiny waves, mostly 0.3ft to 0.7ft, with weak energy – the combined swell energy is stuck between 18 and 98, which is negligible. Winds are mostly onshore or cross-onshore, and even when it goes glassy on the 4th, 7th, and 11th mornings, there’s no swell to work with.

Then on Friday the 14th of August, the swell finally bumps up to 1ft from the NW with a short 6-second period. The combined energy hits 113 and 120 – that’s moderate. But the wind is still onshore, conditions are poor, and the short period means the waves are weak and messy. This reef break needs a clean W swell to really fire, and the 1ft NW swell isn’t the right direction. It’s just not enough.

This is a consistent, exposed reef for experts, but the swell is too small and the wind is all wrong. If you’re a kiter, the choppy conditions on the 14th might be more fun than trying to paddle. For surfers? There’s nothing to get excited about.

Blank runs happen here. Forecasts can turn around, but this one’s a long wait.

Rusty

Short Range Forecast

Light rain (total 3mm), mostly falling on Mon afternoon. Warm (max 23°C on Sun afternoon, min 18°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 9mm), mostly falling on Wed night. Warm (max 23°C on Tue afternoon, min 18°C on Fri morning). Wind will be generally light.

Sat
1
Sunday
2
Monday
3
Tuesday
4
Wednesday
5
Thursday
6
Friday
7
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
NW
8
0.6
NNW
6
0.5
NNW
6
0.6
NNW
6
0.6
NW
6
0.3
WNW
10
0.3
WNW
10
0.3
WNW
10
0.4
WNW
9
0.5
W
9
0.4
WNW
9
0.4
WNW
8
0.4
WNW
8
0.5
WNW
8
0.9
NW
9
0.9
NW
9
0.9
NW
8
0.9
NW
8
0.8
NNW
8
1.1
NW
5
Wave Graph
Metric surfscale
Energy kJ
46
26
18
25
28
19
18
18
27
39
26
24
22
41
107
123
120
95
74
66
Wind (km/h)
15
NNW
5
WSW
5
NW
10
WNW
10
WSW
10
W
5
NNW
5
SSE
5
NE
15
NNW
5
WSW
5
WNW
15
NNW
10
NNE
5
NE
15
NNW
5
NW
5
NW
10
NNW
10
SW
Wind State
on
cross-on
on
on
cross-on
cross-on
glassy
glassy
glassy
on
cross-on
on
on
cross-on
cross
cross-on
on
on
on
cross
High Tide
7:14PM3.71m
7:33AM3.44m
7:47PM3.66m
8:08AM3.39m
8:23PM3.55m
8:46AM3.30m
9:03PM3.40m
9:30AM3.18m
9:53PM3.21m
10:24AM3.04m
10:56PM3.03m
11:36AM2.95m
00:20AM2.92m
Low Tide
1:25AM0.31m
1:33PM0.40m
1:59AM0.36m
2:09PM0.48m
2:36AM0.46m
2:49PM0.60m
3:18AM0.62m
3:37PM0.76m
4:09AM0.80m
4:37PM0.91m
5:14AM0.97m
5:53PM1.00m
clear
clear
clear
clear
part cloud
part cloud
rain showers
rain showers
part cloud
clear
clear
part cloud
part cloud
rain showers
cloud
part cloud
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:56
6:56
6:58
6:58
7:00
7:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:29
9:28
9:27
9:24
9:23
9:22
9:21
 mm
2
1
9
Temp °C
22
21
22
23
22
21
22
22
21
23
22
22
23
22
20
22
20
20
22
21
Feels °C
22
21
23
22
21
22
24
24
23
23
22
24
24
23
22
22
20
20
21
21
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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