Guethary - Les Alcyons/Avalanche Surf Break

Lat Long: 43.43° N 1.62° W

Guethary - Les Alcyons/Avalanche Surf Forecast and Surf Report

Issued: 7 pm 07 Aug 2026 (local time)

Forecast update in  hr  min

Today's Guethary - Les Alcyons/Avalanche sea temperature is
24.6° C
2.9° 

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 8 Aug 2026:

  • Most powerful swell: Sunday 9 Aug, 8PM (local time) - 2.5ft (0.8m), 10s period, NW swell with 136 kJ wave energy.

Best Forecast Surf Conditions for Guethary - Les Alcyons/Avalanche this week:

The most powerful waves expected at Guethary - Les Alcyons/Avalanche in the next 16 days are 0.8m 10s and forecast to arrive on Sunday (Aug 09) at 8PM. 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+)--
Best Surf--
Most Powerful 8PM (Sun 9th Aug)2.5ft (0.8m) 10s

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


The Lowdown

Alright folks, Rusty here. Let’s get into it.

We’re looking at a pretty quiet stretch ahead for Guethary’s famous reef. Right now, the first week is a bit of a write-off. From Saturday 8 August right through to the evening of Monday 17 August, it’s flat or just poor. The swell is tiny, mostly under 3ft, with short, weak periods around 5-10 seconds, and the wind is often cross-onshore or onshore. There’s not enough energy to get excited about – the combined energy stays below 100 (weak) for most of that time, barely hitting three digits on a couple of afternoons, but still poor. That’s a solid ten-day gap with nothing worth paddling out for.

Things start to look a bit more promising on Tuesday morning 18 August. The reef at Guethary - Les Alcyons/Avalanche (France) finally sees a little pulse. Swell is 3ft from the NW at 9 seconds, with combined energy hitting 124 (moderate). The wind is glassy, calm, with a slight air, so it’ll be clean. The wave comment says “surfable but very ordinary” – not a standout, but a chance to get wet after the drought.

The real highlight, the one that’s worth marking on the calendar, lands on Thursday morning 20 August. The swell picks up to 4ft from the NW, period 9 seconds, and combined energy jumps to 179 (moderate). The wind is glassy – calm, with a NNE breeze at 0 mph. That’s clean, glassy surf at a reef that needs good conditions. The water is about average for this time of year, so no surprises there. This is the best on offer: a solid, clean, workable wave for the experts who love this spot. It’s not huge, but it’s clean and the reef will line it up.

Then on Saturday morning 22 August, we get another shot. The swell holds at 4ft from the NW, period 9 seconds, combined energy 220 (moderate). The wind is light cross-off from the SSW at 3 mph, giving clean, lined-up waves. The wave comment says “expect good surf conditions” – this is the second best window. Just be aware the afternoon gets blown out with a moderate onshore breeze.

For the rest of the 16-day window, the surf drops back to poor or marginal. The best calls are the Thursday morning 20 August and Saturday morning 22 August – both clean, moderate energy, and the reef doing its thing. It’s a long wait, but there’s a couple of windows worth chasing.

Rusty.

Short Range Forecast

Heavy rain (total 26mm), heaviest during Sat night. Warm (max 26°C on Sat afternoon, min 19°C on Fri night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 24°C on Tue afternoon, min 19°C on Mon night). Wind will be generally light.

Saturday
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
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
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
NNW
6
0.5
NNW
5
0.4
NNW
5
0.3
NW
12
0.6
NW
10
0.8
NW
10
0.7
NW
10
0.7
NW
9
0.7
NW
9
0.7
NW
9
0.7
NW
9
0.6
NW
8
0.6
NW
8
0.6
NW
8
0.5
NW
8
0.4
WNW
9
0.4
WNW
9
0.3
WNW
9
0.4
WNW
11
Wave Graph
Metric surfscale
Energy kJ
32
15
10
23
89
117
90
81
81
79
74
57
55
41
31
28
26
17
51
Wind (km/h)
10
SW
5
NW
10
N
15
S
10
WNW
10
WNW
10
W
10
W
10
NW
0
W
5
N
10
NNW
10
WSW
10
WNW
10
NW
10
WSW
5
NW
15
NW
10
WSW
Wind State
cross
glassy
cross-on
cross-off
cross-on
on
cross-on
cross-on
on
glassy
glassy
on
cross-on
on
on
cross
on
on
cross-on
High Tide
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
5:13PM4.01m
5:41AM3.78m
5:57PM4.15m
Low Tide
6:34AM1.05m
7:20PM0.94m
7:56AM0.96m
8:38PM0.72m
9:04AM0.74m
9:41PM0.43m
10:01AM0.47m
10:34PM0.15m
10:50AM0.23m
11:22PM-0.05m
11:34AM0.07m
00:05AM-0.14m
clear
clear
clear
rain showers
part cloud
part cloud
thunderstorm
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:03
7:03
7:05
7:05
7:07
7:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:21
9:20
9:19
9:16
9:15
9:14
9:13
 mm
19
7
Temp °C
23
23
26
23
23
23
22
21
23
22
22
24
23
22
24
22
22
24
22
Feels °C
24
24
26
22
24
24
23
22
25
24
25
25
25
24
26
23
24
26
23
  • 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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