Guethary - Les Alcyons/Avalanche Surf Forecast

/ La Cote Basque (36 surf breaks) /

France (410 surf breaks) / Lat Long: (43.43° N 1.62° W)

Surf Forecasts:

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

48hr Weather and Surf, issued 7 pm Thursday 18 Sep 2025 CEST

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 21.4° C
(Which is 1.4°C warmer than normal for this time of year)

How big are the waves at Guethary - Les Alcyons/Avalanche today?

The current surf forecast for Guethary - Les Alcyons/Avalanche at 8PM is: 1.6m 12s primary swell from a West-northwest direction (forecast issued at 07:00pm September 18). The wind direction is predicted to be cross-offshore and the swell rating is 3.

Time (CEST) & Date	Wave Height	Wave Period
Morning (18 Sep)	-	-
Afternoon (18 Sep)	5.5ft (1.7m)	13s
Evening (18 Sep)	5ft (1.6m)	12s

Table - waves today at Guethary - Les Alcyons/Avalanche. (Swell directed towards the surf break)

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Thursday 18			Friday 19								Saturday 20								Sunday 21
	5 PM	8 PM	11 PM	2 AM	5 AM	8 AM	11 AM	2 PM	5 PM	8 PM	11 PM	2 AM	5 AM	8 AM	11 AM	2 PM	5 PM	8 PM	11 PM	2 AM	5 AM	8 AM	11 AM	2 PM
Rating (10 max)	3	3	3	1	1	2	2	2	2	2	0	2	1	1	1	0	0	0	0	0	0	0	1	1
Swell Height Map See all maps
Wave Height (m) & direction (?)	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	NW	NW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW	WNW
Period(s) (?)	12	12	12	11	11	11	10	10	10	10	10	10	10	10	10	9	9	9	9	8	8	8	8	8
Wave Graph (?)
kJ (?)	857	680	595	451	419	359	272	327	267	136	181	194	137	135	129	127	61	61	45	78	162	203	235	230
Wind (km/h)	ENE	E	SSE	WSW	SW	SE	SSE	W	NNE	ESE	WNW	S	SSE	SSE	SSE	W	WNW	WNW	NW	NW	WSW	NW	W	WSW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross- off	cross- off	off	cross	cross	off	off	glass	glass	cross- off	cross- on	cross- off	cross- off	off	cross- off	cross- on	cross- on	cross- on	on	on	cross	on	cross- on	cross
High Tide / height (m)	3:22PM 3.36				3:53AM 3.26				4:07PM 3.58				4:32AM 3.44				4:44PM 3.74					5:06AM 3.57
Low Tide / height (m)			9:31PM 0.60				9:43AM 0.66				10:12PM 0.39				10:22AM 0.45				10:47PM 0.24				10:57AM 0.29

	Thursday 18			Friday 19								Saturday 20								Sunday 21
Sunrise	-	-	-	-	-	7:48	-	-	-	-	-	-	-	7:50	-	-	-	-	-	-	-	7:50	-	-
Sunset	-	8:12	-	-	-	-	-	-	-	8:09	-	-	-	-	-	-	-	8:07	-	-	-	-	-	-

Rain (mm)	-	-	-	-	-	-	-	-	-	-	1	-	1	-	-	-	3	5	3	3	2	4	5	1
Temp. °C	32	31	28	22	20	22	26	32	34	32	22	23	22	22	23	28	20	19	18	17	16	16	15	16
Feels °C (?)	31	29	27	22	20	22	27	33	35	32	19	23	22	21	23	28	19	20	18	17	16	14	14	14

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for La Cote Basque

Wind Update Continuing clean conditions at Guethary - Les Alcyons/Avalanche (calm at Biarritz/Anglet Airport 9 km from Guethary - Les Alcyons/Avalanche). 1.4m 12s groundswell from the WNW to make surfable waves.
1 hour 27 minutes ago Guethary - Les Alcyons/Avalanche

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1 h 27 min ago

4 km/h

SSW

Clean

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