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Surf Forecasts:

Guethary - Les Alcyons/Avalanche surfForecast / La Cote Basque / France

information circle12 Day Weather and Surf, issued 12 am Monday 24 Nov 2025 CET
Forecast update in hr  min  s Forecast update imminent
Guethary - Les Alcyons/Avalanche surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Guethary - Les Alcyons/Avalanche sea temperature is
16.2° C
 (Which is 1.7°C warmer than normal for this time of year)

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

The surf forecast for Guethary - Les Alcyons/Avalanche over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Nov 26) at 4AM. The primary swell is predicted to be 2.5m and 11s period. 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 12 days are 4.0m 12s and forecast to arrive on Sunday (Nov 30) at 4AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Monday (Nov 24) at 10AM.

Wave TypeTime (CET) & Date Wave Height & Period
Next good surf (1 star+) 4AM (Wed 26th Nov)8ft (2.5m) 11s
Best Surf 4AM (Wed 26th Nov)8ft (2.5m) 11s
Most Powerful 4AM (Sun 30th Nov)13ft (4.0m) 12s

Table - best surf conditions forecast for Guethary - Les Alcyons/Avalanche over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Heavy rain (total 57mm), heaviest during Tue morning. Very mild (max 15°C on Sun night, min 7°C on Tue night). Winds decreasing (strong winds from the W on Mon morning, calm by Wed afternoon).

Days 3-6 Weather Summary Heavy rain (total 31mm), heaviest during Fri morning. Very mild (max 14°C on Fri night, min 8°C on Wed night). Wind will be generally light.

Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sun
30
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
2
1
0
0
2
0
3
3
3
2
1
0
0
0
0
3
4
4
0
3
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
2.5
WNW
3
WNW
3
WNW
4
NW
3.5
NW
3
NW
3
NW
1.9
NW
1.4
NW
1.1
NW
0.8
NW
0.6
NW
0.9
NW
1.3
NW
1.4
NW
3
NW
3
NW
3
NW
3.5
NW
4
NW
3.5
NW
Period(s) (?)101111101111111010998998151414131211
Wave
Graph
(?)Metric surfscale
Energy kJ (?)153820152328317331432339174070138818810745129238256365042753550367843762575
Wind
(km/h)
20
SW
30
SW
30
NW
40
WNW
20
NNW
30
NNW
5
NNE
10
E
5
NE
5
SSE
10
SSW
20
W
20
WSW
25
WNW
15
WNW
15
W
10
W
10
W
25
WNW
15
NW
20
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscrossononcross-
on		oncross-
on		cross-
off		glasscross-
off		cross-
off		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		ononcross-
on
High Tide
/ height (m)
6:21AM
3.33
6:44PM
3.05
7:00AM
3.20
7:26PM
2.91
7:45AM
3.08
8:16PM
2.79
8:39AM
2.99
9:18PM
2.72
9:42AM
2.96
10:29PM
2.75
10:52AM
3.01
11:39PM
2.88
11:59AM
3.15
Low Tide
/ height (m)
12:09AM
0.74
12:37PM
0.73
12:46AM
0.86
1:18PM
0.86
1:29AM
0.98
2:06PM
0.97
2:19AM
1.10
3:04PM
1.03
3:20AM
1.16
4:10PM
1.01
4:30AM
1.14
5:18PM
0.90
5:40AM
1.02
6:20PM
0.72
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sun
30
Sunrise-8:10--8:11--8:11--8:12--8:15--8:15--8:17-
Sunset--5:35--5:34--5:34--5:32--5:32--5:31--5:31
light rain
mod rain
light rain
rain showers
rain showers
rain showers
rain showers
part cloud
part cloud
part cloud
cloud
light rain
mod rain
heavy rain
light rain
light rain
rain showers
part cloud
mod rain
light rain
rain showers
Rain (mm)
363141489----41011321-855
Temp. °C151514131212109991113131313141414131212
Feels °C (?)998576667681010910121212797
  • 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 12 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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