Phuket, the biggest island in Thailand normally has a warm weather all year around. The temperatures are typically in the range of 25 – 37°C (77 – 93°F). There are two seasons in Phuket which are dry season and rainy season.
The month of dry season can be seen from December and lasts until March. In these months, typically Phuket will have the clear blue skies with cool breeze and calm seas. The dry season is also the coolest time of the year.
From the month of June until the end of October, it is considered the rainy season. The climate can be characterised as hot with some humidity. The average rainfall is about 2500 mm or about 100 inches.
Get the latest official Phuket weather forecast here: https://tmd.go.th/en/weather/province/phuket