Vietnam
Hanoi in September
In September, Hanoi averages a daytime high of 32 °C and a night-time low of 25 °C, with about 199 mm of rain over the month. It falls outside Hanoi's most comfortable months, November to April.
- Average high
- 32 °C
- Average low
- 25 °C
- Rain in the month
- 199 mm
- Daylight on 15 Sep
- 12 h 10 min
- Comfortable month
- No
- Places to stay
- 507
When to go
How September compares with the rest of the year in Hanoi
September is tied for the 4th warmest month in Hanoi by average daytime high; across the year the highs run from 20 °C to 34 °C and the lows from 15 °C to 27 °C. By day, September is 1 °C cooler than August, and October is 2 °C cooler than September.
September brings 199 mm of rain, more than the monthly average of 129 mm (1545 mm a year); it is the 4th wettest month.
On 15 September the sun is up for about 12 h 10 min, against 10 h 50 min at the shortest and 13 h 20 min at the longest point of the year (calculated from the latitude, sunrise to sunset).
| Month | High | Low | Rain | Comfortable |
|---|---|---|---|---|
| January | 20 °C | 15 °C | 26 mm | Yes |
| February | 21 °C | 16 °C | 26 mm | Yes |
| March | 24 °C | 19 °C | 46 mm | Yes |
| April | 28 °C | 22 °C | 78 mm | Yes |
| May | 32 °C | 25 °C | 182 mm | |
| June | 33 °C | 27 °C | 251 mm | |
| July | 34 °C | 27 °C | 282 mm | |
| August | 33 °C | 26 °C | 282 mm | |
| September | 32 °C | 25 °C | 199 mm | |
| October | 29 °C | 23 °C | 104 mm | |
| November | 26 °C | 19 °C | 47 mm | Yes |
| December | 22 °C | 17 °C | 24 mm | Yes |
Comfortable means average daytime high between 18 °C and 29 °C and under 80 mm of rain in the month. Averages for 1991–2020 over the surrounding area, a grid square about 50 km across, so a coast or a nearby mountain can make the town itself warmer or cooler. Data: CRU TS v4.10, Climatic Research Unit, University of East Anglia (Open Database License).
When to go
Is September a good time to visit Hanoi?
Not by the measure used here: the average high of 32 °C is above 29 °C and about 199 mm of rain is 80 mm or more. The comfortable months in Hanoi are November to April; the nearest are April, before, and November, after.
The measure is about weather for a city stay only; it says nothing about events, school holidays or prices.
Public holidays in Vietnam in September
Nationwide public holidays; shops and offices may close on these dates.
Where to stay
Where to stay in Hanoi
This guide lists 507 places to stay in Hanoi, hotels recorded in Wikidata. By straight-line distance from the centre: under 1 km, 92; 1–3 km, 311; 3–10 km, 98; 10 km or more, 6.
Sources: climate from CRU TS v4.10 (Climatic Research Unit, University of East Anglia; Open Database License), 1991–2020 averages; day length calculated from the latitude; public holidays from python-holidays (MIT); places to stay from each operator's own public pages and Wikidata. How this guide is made.