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

information circle12 Day Weather and Surf, issued 12 am Monday 12 Jan 2026 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
13.5° C
(Which is slightly warmer than usual)


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 Monday (Jan 12) at 7AM. The primary swell is predicted to be 1.5m 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 3.5m 17s and forecast to arrive on Friday (Jan 16) at 7AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Monday (Jan 19) at 7AM.

Wave TypeTime (CET) & Date Wave Height & Period
Next good surf (1 star+) 7AM (Mon 12th Jan)5ft (1.5m) 11s
Best Surf 7AM (Fri 16th Jan)11ft (3.5m) 17s
Most Powerful 7AM (Fri 16th Jan)11ft (3.5m) 17s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Very mild (max 16°C on Tue morning, min 11°C on Sun night). Wind will be generally light.

Days 3-6 Weather Summary Moderate rain (total 11mm), heaviest on Thu night. Very mild (max 14°C on Thu afternoon, min 8°C on Fri night). Wind will be generally light.

Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sun
18
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
2
3
4
4
2
1
3
2
2
3
1
2
0
7
5
5
6
5
4
0
3
Swell
Height Map
Wave Height (m) & direction (?)
1.5
NW
1.7
WNW
2.1
WNW
1.8
WNW
1.4
WNW
1.3
WNW
1.3
WNW
1.2
WNW
1.4
WNW
1.7
WNW
0.9
WNW
0.6
WNW
2.4
WNW
3.5
WNW
3.5
WNW
3.5
WNW
4
WNW
4
WNW
3.5
WNW
2.4
WNW
1.7
WNW
Period(s) (?)111112121212131212111223191716161615141312
Wave
Graph
(?)Metric surfscale
Energy kJ (?)5156151354100353046154336856071326734739016328581555877146714742761909850
Wind
(km/h)
15
S
15
S
10
SSW
10
SSE
15
S
25
S
10
S
5
SSW
10
WNW
5
SW
15
SSE
20
SSW
25
W
10
S
10
SW
15
SW
20
SW
20
W
20
S
20
WSW
10
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
on
cross-
off
cross-
off
cross-
off
cross-
on
cross-
off
crosscrosscrosscross-
on
cross-
off
cross-
on
cross-
off
High Tide
/ height (m)
10:53PM
2.72
11:23AM
2.70
12:04AM
2.68
12:39PM
2.66
1:14AM
2.75
1:47PM
2.73
2:12AM
2.90
2:40PM
2.88
2:59AM
3.08
3:23PM
3.04
3:39AM
3.27
4:01PM
3.19
4:15AM
3.45
4:36PM
3.32
Low Tide
/ height (m)
4:59AM
1.24
5:34PM
1.25
6:11AM
1.28
6:42PM
1.26
7:19AM
1.21
7:43PM
1.18
8:16AM
1.06
8:34PM
1.03
9:04AM
0.88
9:18PM
0.86
9:45AM
0.70
9:57PM
0.68
10:23AM
0.53
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sun
18
Sunrise-8:37--8:37--8:36--8:36--8:34--8:34--8:33-
Sunset--5:51--5:52--5:53--5:54--5:55--5:57--5:58
cloud
part cloud
part cloud
part cloud
cloud
cloud
cloud
part cloud
part cloud
part cloud
cloud
cloud
rain showers
part cloud
cloud
rain showers
light rain
light rain
light rain
light rain
light rain
Rain (mm)
------------4--241233
Temp. °C131415121616141313111314121212910109109
Feels °C (?)9111291010101111899798545456
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

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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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