A northeasterly and very variable flow prevails over the South of the basin. Over the North, it is westerly, moderate and particularly variable.
For Penthièvre :
No gale warning.
For the night from Monday to Tuesday N force 3 in the early part of the night becoming force 2. Gusts reaching 15 knots in the early part of the night.
Smooth to slight sea becoming slight in the middle of the night. Low, fairly long swell from W then from N in the middle of the night. Excellent visibility becoming good in the middle of the night then good. Daytime of Tuesday 22 september : The weather will become more uncertain during the day.
Cloud and long sunny periods. The risk of seeing rain will remain low. In the evening, lots of good clear periods.
No precipitation. NNW force 2 in the morning becoming force 3 in the evening. Gusts reaching 15 knots in the morning. Slight sea becoming smooth to slight in the middle of the day. Low from N then fairly long from W in the evening. Good visibility becoming excellent in the middle of the day.