For Koh Samui :
No gale warning.
The reliability of the situation is very good.
Lots of good clear periods. Possibility of showers In the evening, changeable skies with risk of storms.
Possibility of showers NW force 1 in the middle of the day freshening WSW force 3 in the evening. Smooth sea. Low, short swell from SE. Excellent visibility becoming excellent in the evening.