High 1022 hPa centered on the Celtic Sea remaining almost stationary.
For Trevou-Treguignec :
No gale warning.
For the night from Friday to Saturday SSW force 1 in the early part of the night turning SSE. Gusts reaching 8 knots at the end of the night.
Slight sea. Low, fairly long swell from WNW. Poor visibility temporarily in the middle of the night. Daytime of Saturday 19 september : 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.
No precipitation. SSE force 1 turning ENE in the middle of the day then NE force 2. Gusts reaching 13 knots in the evening. Slight sea. Low, fairly long swell from WNW. Poor visibility becoming excellent in the middle of the day then excellent.