The climate of Nepal varies according to Topography and its altitude which ranges from Tropical to the Arctic.
Monsoon
The most preferred season to trek in the rain shaded areas including Upper Manang, Manaslu, Upper Mustang which is around Annapurna, and Upper Dolpo, etc. These are the regions which are in less contact with rain clouds due to the presence of huge mountains in such areas and are very less affected by the monsoon season. If you are a botanist or a forest researcher then summer is the best season to plan your Muktinath visit. However, you are strictly advised to carry insect repellents and trekking raincoat along with you. However, due to rainfall in this season, it is quite difficult to reach Muktinath by road and landslides can hinder your journey. Also, for your information flight from Pokhara to Jomsom generally gets canceled due to bad weather.
Winter
December, January, and February are the winter months in Nepal which brings freezing cold in the city and especially in the high altitude regions. Although it is a good time to trek and hike at low altitude regions that are generally below 3500 meters. The entire area of Muktinath gets covered with snow during these months. So, if you planning to visit Muktinath in winter then Muktinath Tour by helicopter is the most preferred and the best option.
Summer
This is the second most preferred time to enjoy trekking in Nepal as the weather is quite moderate and favourable. One gets spellbound with the beautiful views of mountains and especially the blossoming rhododendrons which is the national flower of the country.
Autumn
This is the most favourable and heavily crowded season in Nepal and also the peak season of Nepal Tourism. The climate is neither very cold nor very hot during autumn months. The beautiful view of the clear blue sky as the rainy season washes away the dirt and the pollution of the city and the beautiful views of the snow-capped mountains leave the tourists spellbound.
Best Time to Visit
September to November is the best time to plan a Muktinath Temple visit in Nepal. The trekking trails are full of trekkers during these months. It will be quite easy and worthy to visit Muktinath Temple during the autumn season. Spring season is also the best time to visit Muktinath at Mustang, Nepal.