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Lạng Sơn, Vietnam climate

Cfa Humid subtropical

Lạng Sơn has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 32°C, while the coldest is January averaging around 10°C at night. Precipitation totals about 1190 mm a year and is strongly seasonal — August alone averages 223 mm while February barely receives 24 mm.

☀️ Summers

Hot

Highs near 32°C in July.

❄️ Winters

Mild

Lows near 10°C in January.

🌧️ Rain

Wet

About 1190 mm of rain a year.

Wettest in August

⛅ Sky & trend

Often grey

Overcast skies dominate much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Lạng Sơn climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	17	19	22	27	30	32	32	31	30	28	24	20
Avg temp (°C)	14	16	19	23	26	28	28	28	26	23	19	15
Avg low (°C)	10	12	15	19	22	24	24	24	22	19	15	11
Precipitation (mm)	43	24	62	84	113	174	197	223	136	66	40	27

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	17	19	22	27	30	32
Avg temp (°C)	14	16	19	23	26	28
Avg low (°C)	10	12	15	19	22	24
Precipitation (mm)	43	24	62	84	113	174

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	32	31	30	28	24	20
Avg temp (°C)	28	28	26	23	19	15
Avg low (°C)	24	24	22	19	15	11
Precipitation (mm)	197	223	136	66	40	27

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	72	76	80	80	79	85	83	80	70	59	60	63
Relative humidity (%)	77	76	76	75	78	85	87	87	84	81	78	75
Wind speed (m/s)	2.6	2.8	2.9	2.9	2.4	2.1	2.1	1.7	1.9	2.2	2.2	2.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	72	76	80	80	79	85
Relative humidity (%)	77	76	76	75	78	85
Wind speed (m/s)	2.6	2.8	2.9	2.9	2.4	2.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	83	80	70	59	60	63
Relative humidity (%)	87	87	84	81	78	75
Wind speed (m/s)	2.1	1.7	1.9	2.2	2.2	2.5

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Lang Son, a weather station, about 2 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →