January is undoubtedly the coldest month in Hanoi (see Hanoi monthly average temperature). Though the idea of having 7-12 Celsius degree seems to be associated with a nice, cool and no-sweat atmosphere, the reality is rather dark and ugly. The drizzle that goes on days and nights - though not all the time - make the air wet, humid and chilly beyond imagination. The worst part is probably strong cold wind AND no central heating system available indoors!
The average temperature in Hanoi in January falls between 13 and 19 degree, not to mention the colder days which can make your trip rather miserable without warm clothing. The good news is that if you cannot afford to take them in your luggage from home, Hanoi has plenty to offer when it comes to shopping for clothes.
Tips: Essential things for Hanoi in January: scarf, mitten, thin layers of warm sweaters, socks and long-johns if you are from a tropical country.