Lạng Sơn climate

Name: Lạng Sơn
Address: VN

Lạng Sơn is warmest in July, with average highs of 30 °C, and coldest in January, when nights average 10 °C. August is the wettest month (287 mm) and February the driest (44 mm). Figures are 1991–2020 climate normals.

Across a full year Lạng Sơn averages 1,641 mm of rain and 220 days above 25 °C.

Vietnam · population 200,108 · 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 July 30 °C
Coldest month January 10 °C
Driest month February 44 mm
Wettest month August 287 mm
Least cloud October 54 % cloud
Hottest on record June 38 °C
Coldest on record January 1.5 °C

What to expectLạng Sơn through the year

Lạng Sơn has a clear annual cycle: average daily highs run from 17 °C in January to 30 °C in July, a swing of 13 °C in mean temperature across the year.

Counted across a normal year, 220 days a year reach 25 °C, 80 of them reach 30 °C. The warmest reading in the 1991–2020 record is 38 °C, in June.

Rain is strongly seasonal. August averages 287 mm against 44 mm in February — 6.5 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	17.0 °C	59 mm	77 %
February	19.3 °C	44 mm	80 %
March	22.6 °C	79 mm	81 %
April	26.7 °C	97 mm	76 %
May	28.9 °C	222 mm	78 %
June	30.2 °C	253 mm	89 %
July	30.3 °C	267 mm	85 %
August	29.9 °C	287 mm	81 %
September	28.7 °C	160 mm	68 %
October	26.5 °C	77 mm	54 %
November	23.0 °C	51 mm	57 %
December	18.7 °C	45 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	17.0 °C	10.4 °C	13.7 °C	27.3 °C	1.5 °C	1	0
February	19.3 °C	12.3 °C	15.8 °C	32.0 °C	2.4 °C	4	0
March	22.6 °C	15.6 °C	19.0 °C	34.1 °C	6.9 °C	11	1
April	26.7 °C	19.8 °C	22.9 °C	35.8 °C	9.6 °C	21	6
May	28.9 °C	22.6 °C	25.4 °C	36.0 °C	15.1 °C	28	11
June	30.2 °C	24.4 °C	26.8 °C	38.4 °C	18.5 °C	30	17
July	30.3 °C	24.5 °C	26.9 °C	35.4 °C	20.9 °C	31	18
August	29.9 °C	24.0 °C	26.5 °C	34.6 °C	20.2 °C	31	17
September	28.7 °C	22.4 °C	25.2 °C	33.8 °C	15.0 °C	28	8
October	26.5 °C	19.4 °C	22.7 °C	32.2 °C	10.2 °C	23	2
November	23.0 °C	15.5 °C	19.1 °C	31.2 °C	6.9 °C	11	0
December	18.7 °C	11.3 °C	15.0 °C	28.3 °C	2.4 °C	2	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	59 mm	11	11 h/day	77 %	79 %	16 km/h
February	44 mm	10	11 h/day	80 %	80 %	16 km/h
March	79 mm	14	12 h/day	81 %	83 %	17 km/h
April	97 mm	14	13 h/day	76 %	83 %	17 km/h
May	222 mm	21	13 h/day	78 %	84 %	15 km/h
June	253 mm	23	13 h/day	89 %	86 %	14 km/h
July	267 mm	25	13 h/day	85 %	87 %	13 km/h
August	287 mm	25	13 h/day	81 %	88 %	12 km/h
September	160 mm	18	12 h/day	68 %	84 %	13 km/h
October	77 mm	11	12 h/day	54 %	78 %	15 km/h
November	51 mm	8	11 h/day	57 %	76 %	15 km/h
December	45 mm	8	11 h/day	62 %	74 %	16 km/h

How Lạng Sơn 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
Lạng Sơn	30 °C	10 °C	1,641 mm	220
Chongzuo · China	31 °C	10 °C	1,454 mm	233
Bắc Giang · Vietnam	32 °C	13 °C	1,873 mm	248
Thị Trấn Đông Triều · Vietnam	32 °C	13 °C	1,737 mm	251
Thái Nguyên · Vietnam	32 °C	13 °C	2,110 mm	240
Phổ Yên · Vietnam	32 °C	13 °C	1,966 mm	244
Bắc Ninh · Vietnam	32 °C	13 °C	1,878 mm	252

Planning a trip? See the best time to visit Lạng Sơn.

QuestionsCommon questions about Lạng Sơn’s climate

When is the best time to visit Lạng Sơn?

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

How hot does Lạng Sơn get?

In July, the warmest month, daily highs average 30 °C. About 80 days a year pass 30 °C. The highest value in the 1991–2020 record is 38 °C.

How cold does it get in winter?

Nights average 10 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Lạng Sơn?

August, averaging 287 mm over 25 days with rain. The driest month is February with 44 mm. The year as a whole averages 1,641 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 Lạng Sơn 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.