A northwesterly, weak and particularly variable flow prevails over the whole area.
For Saint-Valery-en-Caux :
No gale warning.
For the night from Thursday to Friday WNW force 2 in the early part of the night temporarily NW force 1. Gusts reaching 12 knots at the end of the night.
Slight sea. Low, short swell from NNE. Good visibility. Daytime of Friday 21 august : The unsettled weather will become more unpredictable in the second half of the day.
Skies changeable to very cloudy. Some showers from late morning. In the evening, good clear periods but cloud building.
Light showers progressively becoming less frequent. WNW force 2 in the morning becoming NW force 3 in the middle of the day. Gusts reaching 13 knots in the morning. Slight sea temporarily smooth to slight in the middle of the day. Low, short swell from NNE. Good visibility becoming excellent in the middle of the day.