Hanoi weather in September
Hanoi in September averages 29°C (84°F), 179 mm of rain and 5.6 hours of sun a day. It is one of the wetter months of the year here.
Of the twelve months in Hanoi, September is the fourth warmest, the fifth wettest and the third sunniest.
- Average temp
- 29°C (84°F)
26–32°C · 78–90°F
- Rainfall
- 179 mm
A wet month
- Sunshine
- 5.6 h
hours per day
What is Hanoi like in September?
Daytime
Days are hot, often above 32°C.
Rain
Expect frequent rain — this is a wet month.
Evening
Evenings stay warm.
What should I pack for Hanoi in September?
High-factor sun cream
With daytime highs around 32°C, burn time is short even in shade.
Sunglasses and a brimmed hat
Midday glare is the part people underpack for, not the heat itself.
Loose cotton or linen
Synthetics stop working once you are sweating through them all day.
A refillable water bottle
Daily highs this warm need roughly double the water a temperate day does.
A proper waterproof, not a folding umbrella
179 mm in the month usually arrives as heavy bursts that an umbrella will not cover.
A dry bag for phone and documents
Worth it for one downpour caught between the taxi and the door.
September compared with August and October
September in Hanoi is 0.7°C cooler than August and 131 mm drier than it, which averages 30°C (85°F).
September in Hanoi is 2.3°C warmer than October and 70 mm wetter than it, which averages 27°C (80°F).
Daylight in Hanoi in September
On 15 September the sun is up for 12 hours 16 minutes in Hanoi, rising about 05:43 and setting about 17:59 local time.
September ends 34 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 1 hour 8 minutes short of June, the longest-lit month here.
Where to stay in Hanoi
Dates are a starting point for September.
Travel guides for Hanoi
What to read before you book.
Hanoi weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 17°C / 62°F | 23 mm |
| February | 19°C / 67°F | 23 mm |
| March | 21°C / 71°F | 52 mm |
| April | 25°C / 77°F | 72 mm |
| May | 29°C / 83°F | 204 mm |
| June | 31°C / 87°F | 272 mm |
| July | 31°C / 87°F | 311 mm |
| August | 30°C / 85°F | 310 mm |
| September | 29°C / 84°F | 179 mm |
| October | 27°C / 80°F | 109 mm |
| November | 24°C / 74°F | 73 mm |
| December | 20°C / 67°F | 30 mm |
Check another month
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FAQs about Hanoi in September
September climate averages for Hanoi, 1991–2020.
Hanoi averages 29°C (84°F) in September, ranging from about 26°C (78°F) at night to 32°C (90°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Yes, a lot. September brings about 179 mm, which makes it one of the wetter months here — expect heavy bursts rather than all-day drizzle.
Yes. September averages 29°C (84°F) against 27°C (80°F) in October — 2.3°C warmer.
September is 0.7°C cooler than August, and 131 mm drier.
It is outside the easiest window. The most comfortable stretch here is November to April; September sits outside it, which usually means more heat, more rain, or both — worth it if you would rather have the place to yourself.
About 5.6 hours of sun a day on the 1991–2020 average.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 12 hours 16 minutes of daylight in mid-September, against 13 hours 24 minutes in June and 10 hours 52 minutes in December.
On 15 September, sunrise is about 05:43 and sunset about 17:59 local time. Both shift across the month — the month ends 34 minutes shorter than it starts.
