Because of its tropical climate, weather in Koh-Tao is little uneven:
Summers: The temperature during the months of March to July rises quite high. Humidity level reaches upto 31°Celsius. During these months the island becomes hotter and observes less number of tourists.
Monsoon: The monsoon comes in the month of August to November, and the temperature drops down to28°Celsius. October and November receive the heaviest rainfall.
Winters: This is the driest and shortest season on the island when the soil is good for excursions and trips.The winters arrive in December and last till February. During these months, the rainfall lessens and the temperature drops down to 22°Celsius.
Although the weather in Koh-Tao is quite unpredicted, the best time to visit is from December to April when the weather is pleasant and tourist-friendly.