The climate of Sapa is highly seasonal, with a subtropical climate in the summer and a temperate climate during the winter. Average temperature for Sapa town is 15.4ºC, with a maximum of 29.4ºC and a minimum of 1ºC.
Sapa also experiences a marked wet season from May to September, with the heaviest rainfall occurring in July and August. The weather is also notorious for changing frequently and quickly. It is said that only in Sapa, one can experience many different seasons within only one day.
For the most pleasant weather, the best times to visit Sapa is March and May or mid-September to early December. While trips can be enjoyed year-round, the winters in Sapa get cold, with some fog and drizzle, and the summers have the hottest weather and higher chances of rain, with the rainy season starting in May through September.
If possible, it is recommended to go to Sapa during the week, since the weekend markets can be more crowded with tourists.