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Climate · Hanoi

Hanoi in September

Hot and wet, as the days shorten.

Typical weather, averaged over 30 years

September in Hanoi is hot: highs near 90°F, lows near 76°F. Rain falls on about five days a week, less often as the month goes on, and the days shorten by 26 minutes from the first week to the last.September in Hanoi is hot: highs near 32°C, lows near 24°C. Rain falls on about five days a week, less often as the month goes on, and the days shorten by 26 minutes from the first week to the last.

High
90°F32°Caverage
Low
76°F24°Caverage
Wet days
5a week · 70% of days
Daylight
12h 13mon average

Is September a good time to visit Hanoi?

September sits outside Hanoi's best months, which run from November to February. Expect hot days and rain on about five days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 90°F in September, against 71°F to 94°F through the year.Highs near 32°C in September, against 22°C to 34°C through the year.

Chance of a wet day

70% of days in September, against 23% to 80% through the year.

Cloud cover

74% cover in September, against 42% to 85% through the year.

Daylight

12h 13m in September, against 10h 52m to 13h 23m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August92°33°low 78°low 26°6 wet days a weekRain on about six days a week.
  2. September90°32°low 76°low 24°5 wet days a weekRain on about five days a week.
  3. October87°31°low 72°low 22°3 wet days a weekRain on about three days a week.

Where Hanoi sits, in September

Asia/Bangkok
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
5:43 AMsets 6:01 PM
Above the sea
10 mlow-lying
Latitude
21.0°Nnorthern hemisphere
Nearest of ours
Bãi Cháy124 km east

The land around Hanoi, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Vietnam in September

high · low · wet days
See September on the planning mapThe whole year in Hanoi

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Hanoi. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.