What is the best time of year...

[bigmick22]

(PigDogg @ Aug. 21 2009,14:10) I've been in Thailand every month except March,

same here, strangely enough

[guydesavoy]

Only thing i would add is that September (October) can be very inclement (rainy and overcast). So if you have a choice and like some sun, go later or earlier...