I've been to the Far East about 8 times, mainly mid Oct to early Nov. Every time it's been hot to very hot. I'm talking Thailand, Singapore, Malaysia, Phuket. If you do get rain it normally is short & sharp & with the heat everything, you included, dry out very quickly. It's worth taking a couple of those disposable plastic 'Hoodies'. The ships I've been on handed them out as we 'gangplanked' at some ports where the forecast was 'possible rain'. I wouldn't worry about the weather, just look forward to seeing the different countries & cultures.