Nobody can do this perfectly but here are some pointers:
Jamie in Phuket An account of the weather - and there are a plethora of more links
Weather.com Is a comprehensive site for travelers
Thai Visa Working with the Thai ffice
Wind Guru A lot of information for extreme sports addict.
Webcams (about the weather) in Phuket - there are more
Marina Phuket - Karon Beach
Catch Beach Club - Surin Beach