A northeasterly and mostly variable flow prevails over the South and the East of the basin. Over the North-West, it is southerly, weak and particularly variable.
For Saint-Malo - Port Vauban :
No gale warning.
For the night from Thursday to Friday NNW force 2 in the early part of the night becoming N force 1. Gusts reaching 13 knots in the early part of the night.
Slight sea. Low, short swell from NW. Good visibility becoming good in the middle of the night then poor. Daytime of Friday 21 august : 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.
Light showers progressively becoming less frequent. N force 2 becoming force 3 in the middle of the day then NNE. Gusts reaching 13 knots in the evening. Slight sea. Low, short swell from WNW. Poor visibility becoming excellent in the middle of the day.