For Koh Samui :
No gale warning.
The reliability of the situation is good.
Bright spells increasing during the morning, cloud and sun in the afternoon. No precipitation in the morning, possibility of showers in late afternoon. In the evening, changeable skies with risk of storms.
Possibility of showers W wind force 4 continuing all day. Gusts reaching 22 knots in the middle of the day. Smooth to slight sea. Low, short swell from WSW. Excellent visibility.