A westerly and variable flow prevails over the whole area.
For Saint-Denis-D"Oleron :
No gale warning.
For the night from Tuesday to Wednesday NNW force 4 becoming force 3 in the middle of the night then N. Gusts reaching 17 knots in the early part of the night.
Slight sea. Low, short swell from WNW. Excellent visibility. Daytime of Wednesday 19 august : The sky will remain changeable.
Good clear periods alternating with cloudy spells, rather dense in the morning. Risk of some spots of rain in the morning, no precipitation in the afternoon. In the evening, cloudy spells, sometimes dense.
Chance of light rain. N force 3 turning WNW force 4 in the middle of the day then NW. Gusts reaching 18 knots in the evening. Slight sea. Low, short swell from WNW. Excellent visibility becoming excellent in the middle of the day.