Want to know more about weather in Hanoi? Check out weatherbase.com for good info.
Hanoi is generally humid year-round. The best time to visit is October-March, when generally there is less rain and the temperatures are cool.
I think October and November are ideal: it's Fall in Hanoi, very comfortable.
Luggage and bags:
The bags and suitcase can leave it in hotel but bring small bags with u with when u r planning go see islands.
Clothing/Shoes/Weather Gear: Summer clothes are the best ,sandal ,short,T-shirt ,swimming suit ...if u want to take the boat trip go see all the caves around .
Toiletries and Medical Supplies: Sea sickness pills are required 4 whom is not comfortable in sea .I had vomit alot because not use to with the waves.U can buy in Pharmacy around town but why lost time 4 looking when we have short time to enjoy ?
Photo Equipment: Cover camera avoid the humid ,it may ruin your camera b/c humid is really high in here.If u r planning to buy Film ,look 4 expired date b/c I lost money 4 film that not working (no pictures after develope ),what is great ! VN stores they don't care and don't take back after u buy ,sorry not like US or Europe .
Miscellaneous: This is my booklet with my drawings to communicate with them Vietnamese. On this page I drew two flags, one is China the other is Vietnam, then I have another arrow pointing from Vietnam flag to China flag to tell them I want to get a bus to China.