This autumn season is considered as the best time for trekking in Nepal. The monsoon stops around begin to mid of October. But be careful, often there is still many days of rain in the first half of October so I would suggest not to start before the 15th of October. Most of the times the sky will be very clear with good mountain views. In October the fields and pastures are still green. October is still warm but be prepared that in the mountains it can always be suddenly very cold. In November the weather is getting much colder but the mountains views are crystal clear.
WINTER (Dec – Feb):
This season is noted for occasional snowfall at higher elevations in Himalayas and it is the very cold season with temperatures going down sometimes below -20° C and sometimes freezing temperatures in the sleeping rooms of the lodges. Definitively a down jacket will make you trek much nicer, as most of the lodges will not be rarely heated.
Spring (March – May):
Different varieties of wild flowers, specially the rhododendrons make the hillside a haunting paradise during this spring season. The weather is mostly clear in the morning but soon getting dizzy. The later you are in spring the sooner clouds will mask the mountains. Expect to have regularly some rain showers during the day. An umbrella is a must during this season.
Summer time from June till mid-September makes travel wet and warm. You will rarely see any mountain, just sometimes for a few minutes as the summits are nearly always in the clouds. But there will be enough sun to get bad sunburn! You will see many beautiful flowers and colorful butterflies for people who have visited the area before so that they know the Mountain View, Monsoon is a very interesting and rewarding trekking season. An umbrella is a must as you would be boiled wearing a closed rain coat.