The best time to visit Nepal depends on what activities you plan to do and which regions of Nepal you plan to visit.
The peak tourist season in Nepal is from September to November, which is also the time of the year when the weather is dry and clear. This makes it the best time for trekking in the Himalayas, as you can enjoy clear mountain views and the trails are dry and safe.
Another popular time to visit Nepal is from February to April when the weather is mild and the skies are clear. This is a good time for trekking and other outdoor activities, and you can also enjoy the spring blossoms and festivals such as Holi and Nepali New Year.
If you're looking to visit Nepal for cultural or religious reasons, the best time to visit is during the festivals of Dashain (usually in October) and Tihar (usually in November). These are major Hindu festivals and offer a unique insight into Nepali culture.
The summer months of June to August are generally not recommended for travel due to the monsoon season, which brings heavy rain and occasional landslides, making trekking and outdoor activities difficult. However, the monsoon season does offer some benefits such as lush greenery, fewer tourists, and lower prices.
Overall, the best time to visit Nepal depends on your preferences and interests. It is advisable to check the weather conditions and plan your trip accordingly.