Weather in the mountains is notoriously difficult to predict. Although the days are warm, nights can get very cold.  Autumn or fall, which falls during the months of October and November, is the peak trekking season in Nepal. During these months, temperatures are pleasant, the weather is relatively constant and the mountain views are breathtaking. The high mountains get colder and the lowlands are comparatively warmer, but hiking during daytime is pleasurable.

The next popular trekking season in Nepal is spring, which falls during the months of March through May. Temperatures in this season are similar to the fall season and the trekking trails are relatively less crowded, but the fog and precipitation could be slightly more during spring. It is a clear indication that for experiencing clear mountain views during spring, you need to climb higher elevations of 10,000 feet or more. The level of precipitation gradually increases as spring further advances.

Winters (Jan-Feb) are bit colder but daytime can be quite beautiful if the sun is out. Snowfall is a common site during the months between December and February. It is important to make sure that you stay warm and dry in just about any conditions. So, expect the unexpected.