Thanks to its geographic condition, Sapa has one of the most favourable climates in Vietnam. The temperature remains stably cool throughout the year though winter may see more severe changes, with frost and even snow (mostly from mid-December to mid-January)..
....Humidity is relatively high all year round, between 83-87% and temperature ranges within 15-30 Celcius degree. If you include Sapa in your itinerary, make sure to bring some warm clothes since it can get quite cold at night (see packing tips for Sapa).
How hot is Sapa?
Not very, in comparison with Hanoi or Ho Chi Minh City. Thanks to its high altitude, Sapa is an ideal location for summer retreat during the overheated summer time and the scarcely populated town also has pretty fresh air.
How wet is Sapa?
Be prepared to bring rain coat if visiting during summer time too, since there is infrequent showers. In the winter, fog and frost often make it cold enough to keep yourself warm with rain- and wind-proof outwears.
Best time to visit Sapa
In the summer, Sapa is a popular escape destination for domestic travellers, which may hamper the authentic and original experience of the town. This high season often falls between Juneand August.
In contrast, March-May and September- November are the two recommended periods to visit Sapa if you want a more laid-back natural and rejuvenating holiday.
September is the harvesting season in Sapa so get your camera charged in full or else you will regret every single step you walk