A westerly and variable flow prevails over the whole area.
For La Tranche-sur-Mer :
No gale warning.
For the night from Friday to Saturday NW force 3 in the early part of the night turning N force 2. Gusts reaching 15 knots until the middle of the night.
Smooth to slight sea. Low, fairly long swell from W. Excellent visibility. Daytime of Saturday 22 august : The sky will remain changeable.
Good clear periods alternating with cloudy spells, sometimes dense. Risk of some spots of rain in the morning, possibility of showers in the afternoon. In the evening, cloudy spells, sometimes dense.
Chance of light rain. N force 2 in the morning turning WNW force 3 in the middle of the day. Gusts reaching 15 knots in the evening. Smooth to slight sea becoming slight in the middle of the day. Low from N then from W in the evening. Excellent visibility.