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Surf Forecasts:

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

information circle12 Day Weather and Surf, issued 12 pm 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
15.8° C
 (Which is 1.4°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 3.5m 16s and forecast to arrive on Saturday (Nov 29) at 7AM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (CET) & Date Wave Height & Period
Next good surf (1 star+) 4AM (Wed 26th Nov)8ft (2.5m) 11s
Best Surf10PM (Sat 29th Nov)10ft (3.0m) 14s
Most Powerful 7AM (Sat 29th Nov)11ft (3.5m) 16s

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 49mm), heaviest during Mon morning. Very mild (max 15°C on Mon morning, min 8°C on Tue night). Winds decreasing (fresh winds from the WNW on Mon afternoon, calm by Tue night).

Days 3-6 Weather Summary Heavy rain (total 31mm), heaviest during Sat night. Very mild (max 14°C on Fri night, min 9°C on Thu morning). Wind will be generally light.

Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
0
0
0
0
3
3
1
2
1
0
0
0
0
4
5
4
3
0
1
4
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
3
WNW
3
WNW
4
NW
3.5
NW
3.5
NW
3
NW
1.8
NW
1.5
NW
1.1
NW
0.8
NW
0.6
NW
1.1
NW
1.6
NW
1.4
NW
2.5
NW
3.5
NW
3
NW
2.5
NW
3.5
NW
3
NW
2.5
NW
Period(s) (?)111110111111101099888817161414131312
Wave
Graph
(?)Metric surfscale
Energy kJ (?)194419783045314325561740626432188109441513552604144513537102603387729631881
Wind
(km/h)
35
SW
30
NW
35
WNW
25
NNW
30
NW
10
NE
5
SE
15
N
10
SE
5
SSE
5
SW
10
W
15
WSW
15
W
10
WSW
5
SW
10
WSW
10
WNW
20
NNW
15
N
5
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crossononononcrossglasscross-
on		offcross-
off		crosscross-
on		cross-
on		cross-
on		crosscrosscross-
on		cross-
on		cross-
on		cross-
on		glass
High Tide
/ height (m)
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
12:42AM
3.10
Low Tide
/ height (m)
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
Sunday
30
Sunrise8:10--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-
rain showers
light rain
rain showers
rain showers
rain showers
rain showers
cloud
rain showers
part cloud
part cloud
light rain
rain showers
light rain
cloud
light rain
rain showers
rain showers
heavy rain
light rain
rain showers
rain showers
Rain (mm)
9414777-1--161-25214451
Temp. °C151413131210910910101213131413141313119
Feels °C (?)9967557668811101012121312877
  • 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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