January is considered one of the best times to visit Vietnam, thanks to its dry and warm weather across most of the country. Daytime temperatures range from the mid-20s°C in central and southern regions to cooler evenings as low as 5°C in northern areas, like Sapa and Ha Giang. However, in northern coastal areas, namely Halong Bay, hazy conditions can impact visibility. Popular places to visit in January include Ho Chi Minh City and the islands of Phu Quoc and Con Dao.