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 05 Aug 2026 (local time)

Forecast update in  hr  min

Today's Guethary - Les Alcyons/Avalanche sea temperature is
24.6° C
3.0° 

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 5 Aug 2026:

  • Best quality surf: Thursday 6 Aug, 8AM (local time) - 3ft (0.9m), 8s period, NW swell with cross-offshore winds.
  • Most powerful swell: Monday 10 Aug, 11PM (local time) - 3ft (0.9m), 9s period, NW swell with 141 kJ wave energy.
  • Next surfable swell (1★+): Thursday 6 Aug, 8AM (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 Thursday (Aug 06) at 8AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.2m and 11s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Guethary - Les Alcyons/Avalanche in the next 16 days are 0.9m 9s and forecast to arrive on Monday (Aug 10) at 11PM. Winds are predicted to be glassy at the time the swell arrives.

Wave TypeTime (CEST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Thu 6th Aug)3ft (0.9m) 8s
Best Surf 8AM (Thu 6th Aug)3ft (0.9m) 8s
Most Powerful11PM (Mon 10th Aug)3ft (0.9m) 9s

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


Short Range Forecast

Some drizzle, heaviest during Wed afternoon. Warm (max 24°C on Fri afternoon, min 17°C on Fri morning). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 30mm), heaviest during Sun night. Warm (max 24°C on Sat afternoon, min 18°C on Sun morning). Wind will be generally light.

Wed
5
Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
Tuesday
11
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
1
1
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
0.7
NW
9
0.9
NW
8
0.9
NW
8
0.9
NW
8
0.7
NW
7
0.7
NNW
6
0.7
NNW
6
0.5
NW
5
0.4
NW
5
0.3
NW
12
0.4
NW
10
0.6
NW
10
0.6
NW
9
0.7
NW
9
0.7
NW
10
0.8
NW
9
0.8
NW
9
0.8
NW
10
0.6
NW
9
Wave Graph
Metric surfscale
Energy kJ
53
88
115
109
82
46
35
32
14
7
21
37
60
53
81
92
95
106
108
61
Wind (km/h)
15
NNW
10
NNE
10
NNE
15
NNW
0
WSW
5
NNE
15
NNW
15
WSW
10
NW
10
NW
10
SW
5
NW
20
W
5
W
0
S
10
NNW
0
SSE
5
NE
10
NNW
10
SW
Wind State
cross-on
cross-on
cross
cross-on
glassy
glassy
on
cross
on
on
cross
glassy
cross-on
glassy
glassy
cross-on
glassy
glassy
on
cross
High Tide
9:53PM3.21m
10:24AM3.04m
10:56PM3.03m
11:36AM2.95m
00:20AM2.92m
1:03PM2.97m
1:51AM2.98m
2:25PM3.17m
3:06AM3.18m
3:31PM3.46m
4:06AM3.43m
4:25PM3.77m
4:56AM3.64m
Low Tide
3:37PM0.76m
4:09AM0.80m
4:37PM0.91m
5:14AM0.97m
5:53PM1.00m
6:34AM1.05m
7:20PM0.94m
7:56AM0.96m
8:38PM0.72m
9:04AM0.74m
9:41PM0.43m
10:01AM0.47m
10:34PM0.15m
rain showers
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
rain showers
part cloud
rain showers
rain showers
part cloud
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:00
7:01
7:03
7:03
7:05
7:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:23
9:22
9:21
9:20
9:19
9:16
9:15
 mm
1
9
2
19
Temp °C
23
22
21
22
20
20
24
22
22
24
23
22
23
21
21
23
22
23
26
24
Feels °C
24
22
21
21
19
21
24
23
23
24
25
24
23
22
24
25
24
26
27
26
  • 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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