Lạng Sơn climate
Lạng Sơn (Vietnam) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 22 °C71 °F, and about 1,350 mm53 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Lạng Sơn climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 1966 | 846 | 1356 | 391.5 |
| Feb | 2272 | 1151 | 1662 | 261.0 |
| Mar | 2678 | 1458 | 2068 | 522.1 |
| Apr | 2985 | 1865 | 2475 | 752.9 |
| May | 3188 | 2271 | 2679 | 1455.7 |
| Jun | 3187 | 2475 | 2781 | 2068.1 |
| Jul | 3087 | 2475 | 2781 | 2439.6 |
| Aug | 3086 | 2474 | 2780 | 2479.7 |
| Sep | 2985 | 2271 | 2578 | 1566.1 |
| Oct | 2780 | 1864 | 2272 | 903.6 |
| Nov | 2475 | 1356 | 1966 | 421.7 |
| Dec | 1967 | 947 | 1457 | 281.1 |
| Year | 3188 | 846 | 2271 | 1,35053 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 77% | 74% | 2.2 | 10:56 |
| Feb | 77% | 79% | 2.5 | 11:24 |
| Mar | 77% | 85% | 2.7 | 11:58 |
| Apr | 76% | 80% | 3.6 | 12:38 |
| May | 79% | 80% | 4.6 | 13:10 |
| Jun | 85% | 87% | 4.7 | 13:28 |
| Jul | 86% | 84% | 4.7 | 13:21 |
| Aug | 86% | 82% | 4.5 | 12:53 |
| Sep | 85% | 72% | 4.5 | 12:14 |
| Oct | 82% | 60% | 3.8 | 11:36 |
| Nov | 79% | 60% | 3.2 | 11:04 |
| Dec | 75% | 63% | 2.6 | 10:48 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Lạng Sơn is like
The warmest month is June, with an average high of 31 °C87 °F and a low of 24 °C75 °F. The coldest is January, when highs average 19 °C66 °F and lows 8 °C46 °F. There is a clear seasonal cycle, with 14 °C25.2 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,350 mm53 in of precipitation per year. The wettest three-month stretch is June–August, which brings 52% of the annual total. The wettest month is August (247 mm9.7 in), the driest is February (26 mm1.0 in).
Relative humidity ranges from 75% in December to 86% in July. The clearest skies (lowest average cloud amount, 60%) are typical of November. Average wind speed near the ground ranges from 6 km/h (4 mph) in August to 10 km/h (6 mph) in March. Daylight lasts from about 10.8 hours in December to 13.5 hours in June.
Best time to visit Lạng Sơn
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–March: average highs of 19 °C66 °F to 26 °C78 °F with 26 mm1.0 in to 52 mm2.1 in of precipitation per month.
The most challenging month is July, which is hot, with average highs of 30 °C87 °F, very wet (243 mm9.6 in) and humid (86% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Lạng Sơn
- Wetter months (May–September) — highs 2985 to 31 °C88 °F, lows 2271 to 24 °C75 °F, about 199 mm7.9 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an umbrella or light rain jacket.
- Drier months (October–April) — highs 1966 to 29 °C85 °F, lows 846 to 18 °C65 °F, about 50 mm2.0 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
How Lạng Sơn compares
Compared with Chongzuo, about 86 km to the northeast, Lạng Sơn is on average 0.8 °C1.5 °F cooler and receives a similar amount of precipitation. The difference is largest in May (1.2 °C2.1 °F cooler).
Of the 75 places in Vietnam covered by World Climates, Lạng Sơn is the 73rd warmest by annual mean temperature and the 59th wettest by annual precipitation. See all of them on the Vietnam climate page.
Places in other countries with the most similar temperature and rainfall pattern: Pingxiang (China, Cfa), Nanning (China, Cfa) and Chongzuo (China, Cfa).
Nearby places
- Pingxiang 27 km · 21 °C70 °F · 1,350 mm53 in
- Chũ 57 km · 23 °C74 °F · 1,498 mm59 in
- Chongzuo 86 km · 23 °C73 °F · 1,298 mm51 in
- Bắc Giang 87 km · 24 °C74 °F · 1,549 mm61 in
- Thái Nguyên 99 km · 24 °C74 °F · 1,572 mm62 in
- Bắc Ninh 103 km · 24 °C75 °F · 1,616 mm64 in
- Hạ Long 105 km · 24 °C75 °F · 1,643 mm65 in
- Cẩm Phả 108 km · 24 °C75 °F · 1,671 mm66 in
Frequently asked questions
What is the warmest month in Lạng Sơn?
June is the warmest month in Lạng Sơn, with an average high of 31 °C (87 °F) and an average low of 24 °C (75 °F).
What is the coldest month in Lạng Sơn?
January is the coldest month, with an average high of 19 °C (66 °F) and an average low of 8 °C (46 °F).
When does it rain the most in Lạng Sơn?
August is the wettest month with about 247 mm (9.7 in) of precipitation; February is the driest with about 26 mm (1.0 in).
What is the best time to visit Lạng Sơn?
Judging by long-term averages, the most comfortable months are November–March.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.