A northerly, weak and particularly variable flow prevails over the whole area.
For La Tranche-sur-Mer :
No gale warning.
For the night from Sunday to Monday NNW force 2 in the early part of the night turning NNE. Gusts reaching 15 knots in the early part of the night.
Smooth to slight sea. Low, short swell from WNW. Excellent visibility becoming excellent at the end of the night. Daytime of Monday 17 august : The sky will remain changeable.
Good clear periods alternating with cloudy spells, sometimes dense. Risk of showers in the morning, possibility of a few spots in the afternoon. In the evening, cloudy spells, sometimes dense.
Light showers. NNE force 2 turning WNW force 3 in the middle of the day then NNW. Gusts reaching 18 knots in the evening. Smooth to slight sea becoming slight in the middle of the day. Low, short swell from WNW. Good visibility becoming excellent in the middle of the day.