A northerly, weak and very variable flow prevails over the whole area.
For Royan :
No gale warning.
For the night from Thursday to Friday NNW force 3 in the early part of the night turning NNE force 2. Gusts reaching 16 knots in the early part of the night.
Smooth to slight sea. Low, short swell from WNW. Excellent visibility. Daytime of Friday 21 august : The unstable weather will die away during the day.
Good clear periods alternating with cloudy spells, sometimes dense. Light showers progressively dying out in the morning, no precipitation in the afternoon. In the evening, cloudy spells, sometimes dense.
Chance of light rain. NNE force 2 turning WNW force 3 in the middle of the day then NW. Gusts reaching 15 knots in the evening. Smooth to slight sea. Low, fairly long swell from NW. Excellent visibility.