Hanoi, Vietnam Climate & Monthly Averages
The climate of Hanoi
Hanoi is genuinely wet: 81.8 inches (2078 mm) falls in an average year, across 175 days that carry about 11.9 mm each when they come. Temperatures are the calmer variable, running 70°F (21°C) to 92°F (34°C) between January and June.
Climate quick facts
- Hottest month: June - highs near 92°F (34°C)
- Coldest month: January - highs near 70°F (21°C)
- Decade extremes (2015-2024): 106°F (41°C) high · 40°F (4°C) low
- Wettest month: August (24 rainy days) · Sunniest: June (8.8 h sun/day)
- Climate type: humid subtropical
- Annual swing: 12°C between the average warmest and coolest month · day to night: 7°C
- Months averaging 30°C or hotter: 5
- Average humidity: 80%
Temperatures through the year
January bottoms out at 70°F (21°C) in daylight, 58°F (14°C) after dark. At its warmest, in June, Hanoi runs to 92°F (34°C) in the afternoon and back to 80°F (27°C) by dawn. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 106°F (41°C) and the lowest daily minimum 40°F (4°C). August is the wettest month at 15.9 inches (404 mm) over 24 days; December is the driest.
Rain, sun and snow
Relative humidity averages 80% across the year, more humid than roughly 84% of the cities we track - enough that summer afternoons feel hotter than the thermometer says, which is what the dew point converter is for. Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is November through February. Sunshine averages 6.7 hours a day over the year - duller than almost anywhere else we cover, peaking in June at 8.8 hours. Days and nights are about 7°C apart on average - narrower than about 86% of the cities we track.
How Hanoi compares
- Annual precipitation is 81.8 inches (2078 mm) - wetter than 93% of the 3496 cities we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 70° | 58° | 11 | 2.6 in | 4.1 h/day | 11.0 h | 35% | 77% |
| February | 72° | 60° | 9 | 1.9 in | 4.3 h/day | 11.4 h | 33% | 77% |
| March | 78° | 66° | 13 | 3.0 in | 3.8 h/day | 12.0 h | 42% | 82% |
| April | 84° | 71° | 12 | 3.8 in | 6.3 h/day | 12.6 h | 39% | 82% |
| May | 89° | 77° | 18 | 8.4 in | 8.3 h/day | 13.1 h | 58% | 81% |
| June | 92° | 80° | 17 | 9.5 in | 8.8 h/day | 13.4 h | 57% | 79% |
| July | 91° | 80° | 20 | 11.9 in | 8.7 h/day | 13.3 h | 65% | 81% |
| August | 89° | 79° | 24 | 15.9 in | 7.9 h/day | 12.8 h | 78% | 85% |
| September | 87° | 77° | 22 | 13.7 in | 7.7 h/day | 12.2 h | 72% | 85% |
| October | 83° | 71° | 13 | 7.5 in | 7.7 h/day | 11.6 h | 43% | 78% |
| November | 79° | 67° | 9 | 2.3 in | 7.2 h/day | 11.1 h | 29% | 77% |
| December | 70° | 58° | 7 | 1.4 in | 5.3 h/day | 10.9 h | 22% | 72% |
Hanoi month by month
Average high and low for each month, with the bar showing where it sits in Hanoi's year (left is the coldest night, right is the warmest afternoon).
January
- Rain
- 11 days
- Sunshine
- 4.1 h
- Daylight
- 11.0 h
February
- Rain
- 9 days
- Sunshine
- 4.3 h
- Daylight
- 11.4 h
March
- Rain
- 13 days
- Sunshine
- 3.8 h
- Daylight
- 12.0 h
April
- Rain
- 12 days
- Sunshine
- 6.3 h
- Daylight
- 12.6 h
May
- Rain
- 18 days
- Sunshine
- 8.3 h
- Daylight
- 13.1 h
June
- Rain
- 17 days
- Sunshine
- 8.8 h
- Daylight
- 13.4 h
July
- Rain
- 20 days
- Sunshine
- 8.7 h
- Daylight
- 13.3 h
August
- Rain
- 24 days
- Sunshine
- 7.9 h
- Daylight
- 12.8 h
September
- Rain
- 22 days
- Sunshine
- 7.7 h
- Daylight
- 12.2 h
October
- Rain
- 13 days
- Sunshine
- 7.7 h
- Daylight
- 11.6 h
November
- Rain
- 9 days
- Sunshine
- 7.2 h
- Daylight
- 11.1 h
December
- Rain
- 7 days
- Sunshine
- 5.3 h
- Daylight
- 10.9 h
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
Seasons in Hanoi
Spring (March through May)
Through spring, Hanoi is hot: 84°F (29°C) by day, 71°F (22°C) after dark, and rain falls on around 43 of the 90 days.
Summer (June through August)
Summer is hot here - highs near 91°F (33°C), nights near 79°F (26°C), and rain falls on around 61 of the 90 days.
Fall (September through November)
Through fall, Hanoi runs hot: 83°F (28°C) by day, 72°F (22°C) after dark, and rain falls on around 44 of the 90 days.
Winter (December through February)
Winter is pleasantly warm here - highs near 71°F (22°C), nights near 59°F (15°C), and expect showers on roughly 27 days across the season.
Climate questions, answered
Is Hanoi hot in summer?
Does it rain a lot in Hanoi?
How many hot months does Hanoi have?
Is Hanoi humid?
Best time to visit Hanoi
November to February is the sweet spot for Hanoi - warm days, manageable rainfall and plenty of daylight line up. Expect 73°F (23°C) in the afternoon and around 9 days of rain in a typical month of it. For the same question asked the other way round, see where else is warm in November.
Pack for Hanoi with lightweight, breathable clothing and serious sun protection, proper waterproofs rather than an umbrella - wet days are the norm here and moisture-wicking fabrics for the humidity. Note the gap between afternoon and night: June pairs 92°F (34°C) with 80°F (27°C).
Hanoi temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.