For Trevou-Treguignec :
No gale warning.
For the night from Monday to Tuesday NNE force 1 turning ESE in the middle of the night then SSE. Gusts reaching 13 knots in the early part of the night.
Rough sea. Moderate, fairly long swell from WNW. Excellent visibility becoming good in the middle of the night. Daytime of Tuesday 22 september : The weather will become more uncertain during the day.
Good clear periods alternating with cloudy spells, sometimes more dense in the afternoon. No precipitation in the morning, possibility of showers in late afternoon. In the evening, cloud and long sunny periods.
Possibility of showers SSE force 2 turning SW force 1 in the middle of the day then W force 2. Gusts reaching 18 knots in the evening. Moderate sea. Low, fairly long swell from WNW. Good visibility becoming excellent in the middle of the day then good.