Just returned from Bkk and Samui over the weekend.

Bangkok was hot and steamy during the day with the famous "scattered thunderstorms" in the afternoon and night - we got caught in a storm one evening and it took over an hour by taxi to travel about 4km!

Samui was beautiful - we were there for 8 days and it only rained once - the day we left! - and then only briefly, but a good downpour. It tended to be a bit overcast in the mornings but this usually cleared before lunchtime and it was really lovely ... divinely warm but not too sticky - much nicer than our visit last year when we were there in May.

Hope you have a fabulous time.