For Château d"Oléron :
No gale warning.
We are 85% sure of the situation, because the atmosphere might be less unstable and showers rarer than forecast.
Overcast skies. Some light rain in the morning, showers in the afternoon. In the evening, overcast skies.
Showers followed by rain. SSW force 4 becoming force 5 in the middle of the day then NNW force 4. Gusts reaching 28 knots in the middle of the day. Rippled sea becoming smooth to slight in the middle of the day. Low, fairly long swell from NW. Good visibility becoming excellent in the middle of the day then good.