A northerly, weak and very variable flow prevails over the South of the basin. Over the North, it is westerly, moderate and variable.
For Penthièvre :
No gale warning.
For the night from Monday to Tuesday N force 2 in the early part of the night turning NE. Gusts reaching 11 knots in the early part of the night.
Smooth to slight sea. Low, short swell from W. Good visibility becoming poor in the middle of the night. Daytime of Tuesday 15 september : The weather will be good.
Fair weather with mostly clear skies. In the evening, light cloudy spells.
NE force 2 turning WSW force 3 in the middle of the day then NNW. Gusts reaching 16 knots in the evening. Smooth to slight sea. Low, short swell from W. Poor visibility becoming excellent in the middle of the day.