Thorn Tree travel forum

1

November is good in Bangkok and Phuket/Phi Phi side. It's not so good on the Samui side, so you may want to skip that if that matters to you. You can head to the north instead to Chiang Mai and go trekking and to an elephant camp.

2

My experience of a number of November trips is that wet season is ending or has ended with the exception of the Samui/Phangan/Toa area as sm mentions above.
Normally you can expect fewer showers/storms and more sunshine as the month goes on, and considering that dead-set wet season usually has enough sunshine to make trips enjoyable, November is even better. It is one of my favourite times to travel because of the weather and the fact that high seson crowds are not a problem in most places.
Statistically, the wet season seems to end earlier in the north than elswhere, so you might visit those before you venture to the Andaman.
There is a lot more weather info in the first link below and a lot of island stuff in the next link.

Beaches and Islands Info
Wet Season Info
Some Tips on Not Drowning