Most of Tibet is a high-altitude desert plateau at more than 4000m. The best time to visit is from May to September when the weather is warm and the hiking is good. Days in Summer (June to September) are warm, sunny and generally dry but temperatures drop quickly after dark. It’s always cool above 4000m and often freezing at night, though thanks to the Himalayan rain shadow there is surprisingly little snow in the ‘Land of Snows’. Sunlight is very strong at these altitudes, so bring plenty of high-factor sunscreen and lip balm.
April and mid-October to November are also good times to visit with fewer crowds and warm days. However, avoid travelling to Tibet in March, a politically sensitive month which brings closures and permit problems.