A northeasterly and mostly variable flow prevails over the South of the basin. Over the North, it is westerly, weak and particularly variable.
For Penthièvre :
No gale warning.
For the night from Saturday to Sunday N force 3 in the early part of the night temporarily force 2. Gusts reaching 14 knots in the early part of the night.
Slight sea. Low, fairly long swell from W then from N at the end of the night. Good visibility becoming poor in the middle of the night then poor. Daytime of Sunday 13 september : The weather will be good.
Sunny despite some cloudy spells but no rain. Risk of some spots of rain in the morning, no precipitation in the afternoon. In the evening, skies with few clouds.
N force 3 in the morning temporarily NW force 2 in the middle of the day. Gusts reaching 15 knots in the evening. Slight sea. Low from N. Poor visibility becoming excellent in the middle of the day.