Hanoi is warmest in June, averaging 33° by day and 26° at night. The wettest month is September with 351 mm, and the year brings about 1853 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 22° | 11° | 43 mm | 10.9 h | Sightseeing |
| February | 24° | 13° | 64 mm | 11.3 h | Sightseeing |
| March | 28° | 17° | 62 mm | 11.9 h | Beach weather |
| April | 30° | 21° | 93 mm | 12.5 h | Beach weather |
| May | 32° | 24° | 195 mm | 13.0 h | Rainy season |
| June | 33° | 26° | 222 mm | 13.3 h | Rainy season |
| July | 32° | 26° | 251 mm | 13.2 h | Rainy season |
| August | 32° | 25° | 344 mm | 12.7 h | Rainy season |
| September | 31° | 24° | 351 mm | 12.1 h | Rainy season |
| October | 27° | 20° | 186 mm | 11.5 h | Rainy season |
| November | 26° | 17° | 33 mm | 11.0 h | Beach weather |
| December | 21° | 11° | 9 mm | 10.7 h | Sightseeing |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: March, April and November — highs around 28°, nights no colder than 17°, and at most 93 mm of rain in a month.
Walking the city: January, February and December — highs of 21–24° and no more than 64 mm of rain a month.
Wet season: May, June, July, August, September and October — up to 351 mm in a single month.