October to December are considered the best months to visit, bringing clear skies and plenty sunshine. From May, things get hotter and more humid; the monsoons arrive from June to September.
Getting there
Planes
Thimphu doesn’t have its own airport, so you’ll likely be flying into Paro, Bhutan’s only international airport. Most people get there by flying to Delhi, Bangkok or Calcutta, then hopping on a Druk Air or Bhutan Airlines service. The drive from Paro airport to Thimphu takes around 90 minutes.
Automobiles
Bhutan’s strict tourism laws make it essential to arrange your transport through in advance, so it’s unlikely you’ll be doing any driving of your own.