A northeasterly and very variable flow prevails over the whole area.
For Les Sables-d"Olonne :
No gale warning.
For the night from Monday to Tuesday NNE wind force 3 continuing all night. Gusts reaching 17 knots in the middle of the night.
Smooth to slight sea. Low, fairly long swell from WNW. Good visibility becoming excellent at the end of the night. Daytime of Tuesday 13 may : The sky will remain changeable.
Good clear periods alternating with cloudy spells, sometimes more dense in the afternoon. Risk of showers in the morning, possibility of showers in the afternoon. In the evening, cloud and long sunny periods.
Light showers progressively becoming less frequent. ENE wind force 3 continuing all day. Gusts reaching 17 knots in the evening. Smooth to slight sea. Low, fairly long swell from WNW. Excellent visibility.