Hạ Long climate

Name: Hạ Long
Address: VN

Hạ Long is warmest in June, with average highs of 31 °C, and coldest in January, when nights average 14 °C. August is the wettest month (368 mm) and February the driest (24 mm). Figures are 1991–2020 climate normals.

Across a full year Hạ Long averages 1,749 mm of rain and 230 days above 25 °C.

Vietnam · population 270,054 · 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 31 °C
Coldest month January 14 °C
Driest month February 24 mm
Wettest month August 368 mm
Least cloud October 51 % cloud
Hottest on record May 37 °C
Coldest on record January 4.3 °C

What to expectHạ Long through the year

Hạ Long has a clear annual cycle: average daily highs run from 19 °C in January to 31 °C in June, a swing of 12 °C in mean temperature across the year.

Counted across a normal year, 230 days a year reach 25 °C, 87 of them reach 30 °C. The warmest reading in the 1991–2020 record is 37 °C, in May.

Rain is strongly seasonal. August averages 368 mm against 24 mm in February — 16 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	19.1 °C	34 mm	73 %
February	20.4 °C	24 mm	76 %
March	23.2 °C	44 mm	77 %
April	26.7 °C	71 mm	72 %
May	29.3 °C	216 mm	75 %
June	30.7 °C	269 mm	88 %
July	30.6 °C	305 mm	84 %
August	30.4 °C	368 mm	82 %
September	29.6 °C	237 mm	69 %
October	27.8 °C	99 mm	51 %
November	24.8 °C	51 mm	53 %
December	20.7 °C	31 mm	62 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	19.1 °C	14.2 °C	16.7 °C	26.2 °C	4.3 °C	0	0
February	20.4 °C	15.6 °C	17.9 °C	29.2 °C	5.6 °C	2	0
March	23.2 °C	18.3 °C	20.6 °C	31.0 °C	9.2 °C	8	0
April	26.7 °C	21.9 °C	24.0 °C	33.4 °C	13.7 °C	22	3
May	29.3 °C	24.8 °C	26.8 °C	36.6 °C	17.9 °C	30	11
June	30.7 °C	26.7 °C	28.5 °C	36.2 °C	22.0 °C	30	20
July	30.6 °C	26.7 °C	28.5 °C	35.9 °C	23.4 °C	31	20
August	30.4 °C	26.1 °C	28.0 °C	35.1 °C	22.8 °C	31	18
September	29.6 °C	24.9 °C	27.1 °C	34.8 °C	18.0 °C	30	12
October	27.8 °C	22.7 °C	25.1 °C	32.5 °C	15.6 °C	28	3
November	24.8 °C	19.3 °C	21.9 °C	30.0 °C	10.7 °C	16	0
December	20.7 °C	15.4 °C	18.0 °C	28.0 °C	4.7 °C	2	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	34 mm	6	11 h/day	73 %	78 %	15 km/h
February	24 mm	6	11 h/day	76 %	81 %	14 km/h
March	44 mm	9	12 h/day	77 %	83 %	15 km/h
April	71 mm	12	13 h/day	72 %	84 %	16 km/h
May	216 mm	20	13 h/day	75 %	85 %	16 km/h
June	269 mm	23	13 h/day	88 %	85 %	16 km/h
July	305 mm	24	13 h/day	84 %	86 %	16 km/h
August	368 mm	25	13 h/day	82 %	87 %	13 km/h
September	237 mm	20	12 h/day	69 %	83 %	13 km/h
October	99 mm	11	12 h/day	51 %	76 %	15 km/h
November	51 mm	8	11 h/day	53 %	74 %	15 km/h
December	31 mm	6	11 h/day	62 %	72 %	15 km/h

How Hạ Long compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Hạ Long	31 °C	14 °C	1,749 mm	230
Cẩm Phả · Vietnam	30 °C	14 °C	1,836 mm	220
Haiphong · Vietnam	32 °C	14 °C	1,773 mm	245
Thị Trấn Đông Triều · Vietnam	32 °C	13 °C	1,737 mm	251
Hải Dương · Vietnam	33 °C	13 °C	1,784 mm	252
Bắc Giang · Vietnam	32 °C	13 °C	1,873 mm	248
Lạng Sơn · Vietnam	30 °C	10 °C	1,641 mm	220

Planning a trip? See the best time to visit Hạ Long.

QuestionsCommon questions about Hạ Long’s climate

When is the best time to visit Hạ Long?

That depends on what you want, so the honest answer is a comparison rather than a single month. March, November, December 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 Hạ Long get?

In June, the warmest month, daily highs average 31 °C. About 87 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average 14 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Hạ Long?

August, averaging 368 mm over 25 days with rain. The driest month is February with 24 mm. The year as a whole averages 1,749 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 Hạ Long 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.