Lạng Sơn weather in April

In April, Lạng Sơn sees average daytime highs of 26°C and overnight lows near 20°C, with 97 mm of rain across 14.9 wet days and about 12.5 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 24°C in the first days to 28°C by the end. The sky is clear or mostly clear about 11% of the time in April, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of April to 12 h 48 min by month's end. Set against the rest of the year, April is Lạng Sơn's 6th-clearest and 1st-windiest month. For the whole year in context, see Lạng Sơn's year-round climate.

Daytime high
26°
7th warmest
Overnight low
20°
6th coldest
Rainfall
97 mm
14.9 wet days
Daylight
12 h 30 min
5:38 AM – 6:08 PM
Cloud cover
77%
6th clearest
Wind
11 km/h
1st windiest
Solar energy
3.99 kWh/m²
Travel score
5.5
out of 10

Lạng Sơn is provincial city of Vietnam.

Density
2,533/km²
people per km²
Founded
2002

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 24°C in the first days to 28°C by the end.

A typical April day in Lạng Sơn reaches about 26°C in the afternoon and slips back to 20°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 30°C. Set against its neighbours, April runs about 4°C warmer than March and about 3°C cooler than May.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12318
22418
32418
42418
52418
62419
72419
82519
92519
102519
112519
122519
132620
142620
152620
162620
172620
182620
192720
202721
212721
222721
232721
242721
252721
262721
272821
282822
292822
302822

How April really feels in Lạng Sơn

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Lạng Sơn weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan17° / 11°5711.110.85.1
Feb19° / 13°4410.111.25.6
Mar21° / 16°7914.411.85.5
Apr26° / 20°9714.912.55.5
May29° / 23°22121.2134.0
Jun30° / 25°25723.613.33.0
Jul31° / 25°27024.913.22.9
Aug30° / 24°28525.312.73.0
Sep29° / 23°16418.312.14.2
Oct27° / 20°7510.911.56.4
Nov23° / 16°507.9117.1
Dec19° / 12°458.210.76.3

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 10% of April, with mostly cloudy or overcast conditions the remaining 79%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11585
21684
31783
41783
51783
61783
71783
81981
91981
101882
112080
122080
132179
142179
152179
162278
172278
182278
192278
202278
212377
222377
232377
242377
252377
262377
272476
282476
292476
302476

Chance of precipitation in April

Any precipitation

Lạng Sơn gets around 97 mm of rain over 14.9 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 51% and peaks near 59% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
151
251
350
450
549
649
749
848
948
1048
1148
1248
1348
1448
1548
1648
1749
1849
1950
2050
2151
2251
2352
2453
2554
2655
2756
2857
2958
3059

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

Most of April feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, April lands in the oppressive band about 40% of days. Sticky, muggy-or-worse air turns up on roughly 68% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
113172328200
212162328210
311162228230
410152229240
59152129260
69142128270
79142028290
88142028300
98131928320
108131828340
117121827350
127121727370
137111627391
146111526401
156101526421
166101426431
175101425451
18591425461
19491325471
20481325482
21381325492
22371225512
23271225522
24261225532
25261125533
26161125543
27161125534
28151124554
29151024555
30151024546

Wind in April

Winds average 11 km/h in April, the windiest month of the year.

Across April, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 12 min at the start of April to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over April. Sunrise moves from 5:52 AM to 5:27 AM, and sunset from 6:03 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:526:03
212.25:516:04
312.25:506:04
412.35:496:04
512.35:486:05
612.35:476:05
712.35:466:05
812.35:456:06
912.45:446:06
1012.45:436:06
1112.45:436:07
1212.45:426:07
1312.45:416:07
1412.55:406:08
1512.55:396:08
1612.55:386:08
1712.55:376:09
1812.55:366:09
1912.65:366:09
2012.65:356:10
2112.65:346:10
2212.65:336:10
2312.65:326:11
2412.75:316:11
2512.75:316:12
2612.75:306:12
2712.75:296:12
2812.75:286:13
2912.85:286:13
3012.85:276:14

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 3.99 kWh/m².

For context, solar energy here swings from a low near 2.23 kWh/m² to a high of 4.72 kWh/m² in July across the year — April's 3.99 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
13.3Moderate
23.4Moderate
33.4Moderate
43.5Moderate
53.5Moderate
63.5Moderate
73.6Moderate
83.6Moderate
93.7Moderate
103.8Moderate
113.8Moderate
123.9Moderate
133.9Moderate
144.0Moderate
154.0Bright
164.1Bright
174.1Bright
184.2Bright
194.2Bright
204.2Bright
214.3Bright
224.3Bright
234.3Bright
244.4Bright
254.4Bright
264.4Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in April

Hazard calendar for Lạng Sơn

In seasonPeak

None of Lạng Sơn's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Lạng Sơn's monsoon runs May–September, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is April a good time to visit Lạng Sơn?

Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.5
Sightseeing
5th-best month of the year
5.2
Beach & pool
4th-best month of the year

April is a reasonable time to visit Lạng Sơn for sightseeing.

What to pack for Lạng Sơn in April

From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In April, Lạng Sơn sees daytime highs around 26°C and nights near 20°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

UV index in Lạng Sơn in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Lạng Sơn peaks around June 23 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 6 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highVery highExtremeVery highHighJun 23UV 12Dec 14UV 6
UV index (midday)Level
Jan6High
Feb7High
Mar9Very high
Apr7High
May9Very high
Jun12Extreme
Jul12Extreme
Aug10Extreme
Sep10Very high
Oct8Very high
Nov6High
Dec6High

Air quality in Lạng Sơn in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.

Air quality in Lạng Sơn is worst in December — around 58 µg/m³ PM2.5 (unhealthy), about 2.3× the cleanest month (July, 25 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0204060JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyDec 2358 µg/m³Jul 1625 µg/m³
PM2.5 (µg/m³)Level
Jan57Unhealthy
Feb55Unhealthy
Mar55Poor
Apr54Poor
May37Poor
Jun29Moderate
Jul25Moderate
Aug29Moderate
Sep36Poor
Oct43Poor
Nov50Poor
Dec58Unhealthy
Location & terrain

Where is Lạng Sơn?

Lạng Sơn sits at 21.9°N, 106.8°E, 265 m above sea level, in Vietnam. The nearest listed city is Thị Trấn Na Dương, 26 km away.

Topography around Lạng Sơn

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Lạng Sơn.

Within 3 km, the terrain around Lạng Sơn has only modest variations in elevation — a maximum elevation change of 171 m around an average of 282 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 978 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,481 m.

The land around Lạng Sơn is covered by trees (46%) and artificial surfaces (32%) within 3 km, trees (80%) within 16 km, and trees (89%) within 80 km.

3 km
171 m
16 km
978 m
80 km
1,481 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Thị Trấn Na Dương 26 km · Thị Trấn Thất Khê 54 km · Chũ 57 km · Thị Trấn Ba Chẽ 84 km · Bắc Giang 87 km · Thị Trấn Tiên Yên 88 km · Thị Trấn Đông Triều 89 km · Thị Trấn Mạo Khê 90 km

Vietnam travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C / F
220 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,066
2025
Happiness
6.4 / 10
World Happiness, 2025
Safe drinking water
59%
of population, 2024
Homicide rate
1.5
per 100k, 2011
Road deaths
30.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 500
Religion
none 86%Catholic 6%Buddhist 6%Protestant 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Lạng Sơn (21.8526°, 106.761°, elevation 265 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).