In this forest-and-tea district on the Bhutan border, the monsoon is fierce — the Raidak and Sankosh rivers rise often. Winters are delightful, though morning fog often delays national-park safaris.
November–March — rain is low and roads are in good shape. The national park usually stays closed during the monsoon (June–September).
Heavy rain puts NH31C and riverside roads at risk of waterlogging. Check the multi-day forecast before travelling in the monsoon.
January dawns drop to around 8–10°C — a light shawl and jacket keep you comfortable.