During the periods when we organize our trips to Nepal, the weather is generally good and the temperatures are pleasant during the day. It can be cold in the evening or even very cold in Mustang and Haut-Mustang, where the climate is not very predictable. Definitely bring warm clothes.
In general, anticipate little rain, but nevertheless bring rain gear or waterproof clothing.
Consult general information sites and the list in your Detailed Travel Program to find out what type of equipment and clothing to pack for your trip.