For Koh Samui :
No gale warning.
The reliability of the situation is good.
Cloud and sun in the morning, skies clouding over with storms forming in the afternoon. Risk of some spots of rain in the morning, showers in the afternoon. In the evening, storms as night falls.
Showers becoming less frequent. W force 3 becoming force 4 in the middle of the day then WSW. Gusts reaching 19 knots in the middle of the day. Smooth to slight sea. Low, short swell from WSW. Excellent visibility.