For Koh Tao :
No gale warning.
The reliability of the situation is good.
Very cloudy with risk of thunderstorms in the morning, storms developing in the afternoon. Risk of showers in the morning, showers in the afternoon. In the evening, stormy but gradually improving.
Showers. SW force 4 becoming WSW force 3 in the middle of the day then SW. Smooth to slight sea. Low, short swell from SSW. Excellent visibility becoming good in the middle of the day then good.