For Berck sternes :
No gale warning.
For the night from Sunday to Monday WNW force 2 in the early part of the night temporarily force 3. Gusts reaching 13 knots at the end of the night.
Smooth sea. Low, short swell from W. Good visibility becoming good in the middle of the night then good. Daytime of Monday 21 september : The unstable weather will die away during the day.
Skies changeable to very cloudy. Some light showers in the morning, possibility of showers in the afternoon. In the evening, good clear periods but lots of cloud, too.
Light showers progressively becoming less frequent. NW wind force 3 continuing all day. Gusts reaching 15 knots from the middle of the day. Smooth to slight sea becoming smooth in the evening. Low, short swell from W. Good visibility becoming excellent in the middle of the day then excellent.