Mù Cang Chải, the wet season is warm, muggy, and overcast and the dry season is cool and mostly clear. Over the course of the year, the temperature typically varies from 42°F to 78°F and is rarely below 35°F or above 84°F.

Based on the tourism score, the best times of year to visit Mù Cang Chải for warm-weather activities are from late March to mid May and from late September to mid October.

Detail here