In reply to sarahkeast:
Monsoon trekking is great it doesn't rain all the time, usually once a day for a few hours. Points to remember:
1)Roads disappear - this will usually mean carrying your luggage over a landslip to the next bit of decent road and a waiting bus.
2)Leeches - There will be leeches, lots of leeches. keep exposed skin covered and we had little bags of salt to bat them with which made them drop off. In this regard tea houses are better than camping.
3) It will be wet - obvious really but a good set of waterproofs and dry bags will be very useful.
4) Quieter - not so crowded as in the more popular seasons and a bit more relaxing