For Portonovo :
No gale warning.
We are 70% sure of the situation, because the high pressure system could move in more quickly than forecast.
Cloudy spells, dense at times in the morning, sunny in the afternoon. Risk of showers in the morning, no precipitation in the afternoon. In the evening, clear skies.
ENE force 3 turning NNE in the middle of the day then N. Gusts reaching 20 knots in the morning. Smooth to slight sea temporarily slight in the middle of the day. Low, short swell from NNE. Excellent visibility.