Hanoi, Vietnam Climate & Monthly Averages
Hanoi has a humid subtropical climate. June is the hottest month, averaging 92° by day; January is the coldest at 70°.
Rain, not cold, divides the year in 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.
The wet-and-dry rhythm at a glance
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.
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.
More climate facts for Hanoi
- 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%
Choosing the right part of the year in Hanoi
Choose dates by rain, not just temperature
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.
What the humidity changes
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).
Warm all year: the monthly rain pattern
Each card shows the average high and low. The bar places that month between Hanoi's coldest night and 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
Looking for warmer alternatives? Browse warm places by month, or compare Hanoi's coolest part of the year: January, December, February.
Monthly temperature and rain 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% |
How Hanoi compares for rain and warmth
- Annual precipitation is 81.8 inches (2078 mm) - wetter than 93% of the 3496 cities we track.
These comparisons use the same ten-year window for every city in the dataset.
How the calendar changes in warm-weather 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.
Questions about heat and rain in Hanoi
Is Hanoi hot in summer?
Does it rain a lot in Hanoi?
How many hot months does Hanoi have?
Is Hanoi humid?
Hanoi temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.