For Saint-Cast :
No gale warning.
For the night from Saturday to Sunday S force 1 in the early part of the night turning SE. Gusts reaching 10 knots until the middle of the night.
Slight sea becoming smooth to slight in the middle of the night. Low, long swell from NW. Poor visibility becoming poor at the end of the night. Daytime of Sunday 28 december : Warning:reduced visibility early in the day.
Sunny spells with possibility of mist forming in the morning, predominantly sunny in the afternoon. No precipitation. In the evening, cloud and long sunny periods.
Possibility of showers SE force 1 turning E force 2 in the middle of the day then NNE force 3. Gusts reaching 17 knots in the evening. Smooth to slight sea. Low, long swell from NW. Poor visibility becoming good in the middle of the day then poor.