Hanoi climate

Name: Hanoi
Address: VN

Hanoi is warmest in June, with average highs of 33 °C, and coldest in January, when nights average 13 °C. August is the wettest month (320 mm) and February the driest (28 mm). Figures are 1991–2020 climate normals.

Across a full year Hanoi averages 1,730 mm of rain and 251 days above 25 °C.

Vietnam · population 8,053,663 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month June 33 °C
Coldest month January 13 °C
Driest month February 28 mm
Wettest month August 320 mm
Least cloud October 58 % cloud
Hottest on record May 39 °C
Coldest on record December 3.8 °C

What to expectHanoi through the year

Hanoi has a clear annual cycle: average daily highs run from 20 °C in January to 33 °C in June, a swing of 13 °C in mean temperature across the year.

Counted across a normal year, 251 days a year reach 25 °C, 142 of them reach 30 °C. The warmest reading in the 1991–2020 record is 39 °C, in May.

Rain is strongly seasonal. August averages 320 mm against 28 mm in February — 11 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	19.6 °C	41 mm	78 %
February	21.7 °C	28 mm	79 %
March	24.8 °C	58 mm	80 %
April	28.7 °C	102 mm	73 %
May	31.1 °C	230 mm	76 %
June	32.6 °C	228 mm	88 %
July	32.3 °C	267 mm	85 %
August	31.4 °C	320 mm	82 %
September	30.3 °C	242 mm	71 %
October	28.2 °C	121 mm	58 %
November	25.0 °C	57 mm	58 %
December	20.9 °C	35 mm	65 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	19.6 °C	13.3 °C	16.4 °C	29.9 °C	4.5 °C	4	0
February	21.7 °C	15.0 °C	18.2 °C	34.7 °C	4.9 °C	9	1
March	24.8 °C	18.0 °C	21.1 °C	37.0 °C	8.6 °C	15	4
April	28.7 °C	21.6 °C	24.8 °C	37.9 °C	12.6 °C	24	12
May	31.1 °C	24.3 °C	27.3 °C	38.9 °C	16.8 °C	30	21
June	32.6 °C	26.0 °C	28.9 °C	38.7 °C	19.5 °C	30	26
July	32.3 °C	26.0 °C	28.7 °C	37.8 °C	22.1 °C	31	26
August	31.4 °C	25.4 °C	27.9 °C	36.3 °C	21.7 °C	31	24
September	30.3 °C	24.1 °C	26.8 °C	35.2 °C	17.5 °C	29	19
October	28.2 °C	21.5 °C	24.6 °C	34.1 °C	11.4 °C	27	8
November	25.0 °C	17.8 °C	21.2 °C	33.4 °C	8.6 °C	17	1
December	20.9 °C	13.8 °C	17.4 °C	30.8 °C	3.8 °C	5	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	41 mm	8	11 h/day	78 %	77 %	12 km/h
February	28 mm	7	11 h/day	79 %	78 %	13 km/h
March	58 mm	10	12 h/day	80 %	81 %	14 km/h
April	102 mm	11	13 h/day	73 %	81 %	14 km/h
May	230 mm	17	13 h/day	76 %	81 %	13 km/h
June	228 mm	18	13 h/day	88 %	81 %	12 km/h
July	267 mm	21	13 h/day	85 %	83 %	12 km/h
August	320 mm	23	13 h/day	82 %	86 %	11 km/h
September	242 mm	19	12 h/day	71 %	84 %	11 km/h
October	121 mm	11	12 h/day	58 %	78 %	12 km/h
November	57 mm	7	11 h/day	58 %	76 %	12 km/h
December	35 mm	6	11 h/day	65 %	73 %	12 km/h

Planning a trip? See the best time to visit Hanoi.

QuestionsCommon questions about Hanoi’s climate

When is the best time to visit Hanoi?

That depends on what you want, so the honest answer is a comparison rather than a single month. February, March, November sit closest to 20 °C on average, June is the warmest month and February the driest. The month-by-month table above has the full picture.

How hot does Hanoi get?

In June, the warmest month, daily highs average 33 °C. About 142 days a year pass 30 °C. The highest value in the 1991–2020 record is 39 °C.

How cold does it get in winter?

Nights average 13 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Hanoi?

August, averaging 320 mm over 23 days with rain. The driest month is February with 28 mm. The year as a whole averages 1,730 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Hanoi rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.