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 24 Sep 2026 (local time)

Forecast update in  hr  min

Today's Guethary - Les Alcyons/Avalanche sea temperature is
22.0°C
2.5° 

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 24 Sep 2026:

  • Best quality surf: Saturday 26 Sep, 11AM (local time) - 7ft (2.2m), 14s period, WNW swell with glassy winds.
  • Most powerful swell: Saturday 26 Sep, 5AM (local time) - 7ft (2.2m), 14s period, WNW swell with 2,082 kJ wave energy.
  • Next surfable swell (1★+): Saturday 26 Sep, 11AM (local time) - 7ft (2.2m), 14s 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 Saturday (Sep 26) at 11AM. The primary swell is predicted to be 2.2m and 14s 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 14s and forecast to arrive on Saturday (Sep 26) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 3s period and expected on Wednesday (Sep 30) at 11AM.

Wave TypeTime (CEST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Sat 26th Sep)7ft (2.2m) 14s
Best Surf11AM (Sat 26th Sep)7ft (2.2m) 14s
Most Powerful 5AM (Sat 26th Sep)7ft (2.2m) 14s

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


Short Range Forecast

Mostly dry. Warm (max 30°C on Thu afternoon, min 17°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 2mm), mostly falling on Sun night. Warm (max 31°C on Tue afternoon, min 18°C on Sun night). Wind will be generally light.

Thu
24
Friday
25
Saturday
26
Sunday
27
Monday
28
Tuesday
29
Wednesday
30
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
0
1
2
4
2
3
3
2
2
2
3
3
3
2
2
2
0
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
WNW
12
1.2
NW
12
1.1
NW
11
1
NW
18
1.8
NW
15
2.2
WNW
14
1.9
NW
13
1.8
NW
12
1.6
NW
12
1.6
NW
12
1.4
NW
11
1.3
NW
11
1.4
NW
12
1.6
NW
11
1.6
NW
11
1.4
NW
11
1.3
WNW
11
1
NW
12
1
WNW
11
1.2
WNW
10
Wave Graph
Metric surfscale
Energy kJ
496
407
273
635
1377
2025
1269
925
678
655
471
375
542
626
637
521
396
264
256
283
Wind (km/h)
10
N
10
SW
15
W
15
WNW
10
W
0
WNW
15
N
0
ESE
0
SE
10
NNW
0
SSE
5
ESE
5
NNW
5
S
15
S
15
S
10
SSE
15
SSW
10
NNW
5
SE
Wind State
cross-on
cross
cross-on
on
cross-on
glassy
cross-on
glassy
glassy
cross-on
glassy
off
glassy
glassy
cross-off
cross-off
cross-off
cross-off
cross-on
off
High Tide
4:04PM3.47m
4:25AM3.41m
4:36PM3.70m
4:57AM3.61m
5:09PM3.87m
5:29AM3.77m
5:43PM3.97m
6:02AM3.85m
6:18PM3.97m
6:37AM3.85m
6:56PM3.87m
7:14AM3.76m
7:37PM3.67m
Low Tide
10:12PM0.43m
10:22AM0.43m
10:45PM0.21m
10:55AM0.23m
11:17PM0.05m
11:29AM0.08m
11:50PM-0.02m
12:04PM0.02m
00:25AM0.01m
12:42PM0.04m
1:02AM0.14m
1:22PM0.17m
1:43AM0.36m
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
part cloud
cloud
rain showers
cloud
cloud
part cloud
part cloud
cloud
part cloud
cloud
part cloud
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:56
7:56
7:58
7:58
8:00
8:00
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:00
7:59
7:57
7:54
7:53
7:52
7:50
 mm
2
3
Temp °C
30
25
20
21
19
18
21
19
21
23
19
20
26
26
25
31
28
24
21
19
Feels °C
28
24
19
21
20
19
20
19
22
22
20
21
27
27
24
29
27
23
22
20
  • Map Icons:
  • Break
  • 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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