For every trekking season below we list the average temperatures in Kathmandu, which lies at an altitude of 1300 m. If wanting to calculate the potential temperatures during your trek then please note that for every 100 meters of ascend the temperature will fall 0.5 degrees. Thus, when doing for example the Everest Base Camp trek and reaching Kala Patthar which lies at an altitude of 5,400 m, then the temperature will have fallen additionally 27 degrees, compared with sea level. Please also note that the below are average temperatures only and therefore lower temperatures are possible, and, additionally the chill factor may make it considerably colder. Please therefore always choose equipment which can cope with sufficiently low temperatures during the season in which you're trekking. (Equipment lists provided further below also).
Spring Trekking Season – Mar to May
While October to November is categorized as Nepal’s high season spring is by all means a great trekking season as well. As opposed to fall the spring trekking weather will be warmer and more comfortable at higher altitudes. Also, some treks will during April-May present you with lots of beautiful Rhododendron forests in full blossom. Due to the warmer weather spring is also high season for climbers attempting one or more of Nepal’s eight +8,000m mountains.
Average daily temperature, at 1,400 m, Mar: 24 degrees; May: 28 degrees
Average nightly temperature, at 1,400 m, Mar: 8 degrees; May: 16 degrees
Summer Trekking Season – end June – mid Sept
While trekking is still possible this is the worst season due to the monsoon hitting Nepal at the beginning of July and lasting for approx. two months. During monsoon it is wet and hot. Rain falls almost every day, but for a limited number of hours. It is still possible to do trekking in Nepal, but the conditions are simply worse compared with Spring and Fall. During Monsoon season the Upper Mustang trek and the Manaslu trek are better than other treks in Nepal, as they are located in the Trans Himalayan Zone, which receives less rain.
Average daily temperature, at 1,400 m, Jun: 28 degrees; Sept: 27 degrees
Average nightly temperature, at 1,400 m, Jun: 19 degrees; May: 18 degrees
Fall Trekking Season – mid Sept – end Nov
This is known as the best trekking season in Nepal. The monsoon has cleared the atmosphere and the weather is stable, normally giving quite a number of days with a clear blue sky. While September can be rather warm and normally snow free below 4,000 m the weather will be much colder in December. Being Nepal’s ‘high season’ you can expect quite a number of trekkers.
Average daily temperature, at 1,400 m, Sept: 27 degrees; Nov: 19 degrees
Average nightly temperature, at 1,400 m, Sept: 18 degrees; Nov: 3 degrees
Winter Trekking Season – end Nov – mid Feb
While the weather is indeed likely to provide quite some blue sky and sun, it is rather cold, especially as you reach higher altitudes. Trekking is without a doubt possible, however, warm clothes is required, and trekking passes in higher altitudes may be blocked by snow.
Average daily temperature, at 1,400 m, Dec: 19 degrees; Feb: 20 degrees
Average nightly temperature, at 1,400 m, Dec: 3 degrees; Feb: 4 degrees