For Koumac :
No gale warning.
The reliability of the situation is good.
Very cloudy skies with short clear spells. No precipitation. In the evening, very cloudy skies to overcast.
No precipitation. SSE force 3 in the morning temporarily force 4 in the middle of the day. Gusts reaching 20 knots in the middle of the day. Moderate sea. Low, fairly long swell from S. Excellent visibility.