Will it be cold in Sapa?
The average temperature in Sapa during the winter months (November to March) is about 10 degrees celsius. During this time it would be wise to bring a good jacket and be well-layered. It is highly recommended to not bring cotton clothes in the winter months if possible.
Footprint has experienced Sapa even with snow during the winter time. This is quite rare, however global climate change is making it harder for us to predict the weather. In recent years, the coldest temperature we have experienced has been 3 degrees celsius. These cold days never last long. Usually in about 2 - 3 days the sun comes out and the temperature begins to rise.
If you are trekking to the remote villages, please note that the temperature in the village is always warmer than in Sapa, about 3 - 7 degrees different.
See the best time to visit Sapa here: http://www.footprintsvietnam.com/FAQs/Sapa/Best-time-to-visit-Sapa.htm