Days are usually clear above 2,500 meters, though depending on the season, the weather in the mountainous region can occasionally be erratic. Nepal's Himalayan regions' leading trekking and travel seasons run from April to May. The mornings and middays are typically sunny and clear during this time. Still, occasionally, the afternoons can be cloudy and obstruct views of the peaks.
Between September and November, when the days are usually clear with blue skies and mountain views, is the ideal time to travel to Nepal's Himalayan regions. Although there is a slight chance of snow above 2,800 meters, the day will be fine, with sunshine and cold in the morning, late afternoon, and shade. The monsoon rainy months of July through mid-September are cloudy and humid, but they are also the rainiest.
The best time will be from March to May when the 2,000–3,000 m high wildflowers are in full bloom, and the treelines and vegetation begin to decline for the rough arctic terrain. While it will be sunny and between 15 and 20 degrees Celsius during the day, the morning and evening hours can be much colder, with a minimum of -0 to 05 degrees Celsius, without considering the effects of the wind.
Use powerful sunscreens and creams to protect your skin because the atmosphere is thinner and less pressured above 3,000 meters. It would help to use good sun/snow glass to prevent the strong and bright reflection of the sun and snow.
The most apparent days from mid-September to December will have maximum temperatures of 15-20 degrees Celsius during the day in direct sunlight and minimum temperatures of -5 to -0 degrees Celsius in the morning and at night. From December to March, the coldest months will be the hardest, with minimum temperatures of -10 to -15 degrees Celsius and maximum temperatures of 15 to 18 degrees Celsius without wind chill. However, the majority of the daytime will be clear and blue.
