A northerly, weak and particularly variable flow prevails over the whole area.
For Saint-Quay-Portrieux :
No gale warning.
For the night from Friday to Saturday NNE force 2 becoming force 1 in the middle of the night then NE. Gusts reaching 14 knots in the early part of the night.
Smooth to slight sea. Low, short swell from NW. Good visibility becoming good in the middle of the night then good. Daytime of Saturday 22 august : The atmosphere will remain unstable.
Good clear periods alternating with cloudy spells, sometimes dense. Light showers all day. In the evening, cloudy spells, sometimes dense.
Chance of light rain. NE force 2 becoming NNE force 3 in the middle of the day then N. Gusts reaching 17 knots in the evening. Smooth to slight sea. Low, short swell from NW. Good visibility becoming excellent in the middle of the day then good.