Phuket has a tropical monsoon climate. It's warm all year round, but the two periods of April-May and September-October are the hottest. The September-October period is also the wettest.
The best time to visit Phuket is during the cool NE monsoon season, from November though March, when it isn't so humid, and the cool breezes keep things comfortable. The average temperature is around 75°F to 89°F (24°C to 32°C).
The hottest time is from April through May, with temperatures ranging from 80°F to 95°F (27°C to 36°C). There are frequent short heavy thundery showers, offering welcome relief from the temperature and humidity. The Thai New Year occurs on April 13th and everyone sprinkles (or throws) cool water on each other. No wonder!
We locals enjoy June, July and August, since the weather is usually fine and our favourite haunts remain uncrowded. The usual pattern is brief but heavy showers, with plenty of sunshine between downpours. Everything is a little less expensive at this time of year, as well. Temperatures range between 70°F and 90°F (20°C to 33°C).
During September and early October sailors begin to batten the hatches. This makes an ideal time to haul out and visit abroad. One consolation for those who remain is that the the anchorages, outdoor restaurants and cruising grounds are relatively uncluttered by visitors. And even at this time, we still get long intervals of sunshine between the heavy showers.
Anyway, plenty of low season activities, both water and land-based, still offer themselves on Phuket during this wettest part of the summer season.
Daily weather reports in English, based on daily weather info & faxes from Bangkok(all local Thai time):
07:30 hrs daily 14320 HF SSB
07:40 hrs daily 10118 HF SSB
07:55 hrs VHF 69 - via Phuket Boat Lagoon Phuket only
- Phuket FantaSea Cultural Theme Park
- Phi Phi Islands Tour with Express Boat
- James Bond Island Full-Day Tour via Big Boat
- Coral & Racha Islands Full-Day Tour
- Whitewater Rafting & 4-Wheel-Drive Adventure
- Sea Kayaking at Ang Thong Marine Park
- Flying Hanuman Ziplining Experience
- Canoeing Excursion in Phang Nga Bay with Thai Buffet Lunch
- Introduction to City Tour
- John Gray's Cave Canoeing Tour in Phang Nga Bay