Cao Bằng weather in April

In April, Cao Bằng sees average daytime highs of 25°C and overnight lows near 19°C, with 111 mm of rain across 17.1 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 23°C in the first days to 27°C by the end. The sky is clear or mostly clear about 12% of the time in April, and the air most often feels muggy.

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 Cao Bằng's 5th-clearest and 1st-windiest month. For the whole year in context, see Cao Bằng's year-round climate.

Daytime high
25°
7th warmest
Overnight low
19°
7th coldest
Rainfall
111 mm
17.1 wet days
Daylight
12 h 30 min
5:39 AM – 6:11 PM
Cloud cover
75%
5th clearest
Wind
8 km/h
1st windiest
Solar energy
3.8 kWh/m²
Travel score
5.3
out of 10

Cao Bằng is former provincial capital city of Cao Bằng province, Vietnam.

Density
683/km²
people per km²
Founded
2012

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 23°C in the first days to 27°C by the end.

A typical April day in Cao Bằng reaches about 25°C in the afternoon and slips back to 19°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 30°C. Set against its neighbours, April runs about 5°C warmer than March and about 3°C cooler than May.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12317
22317
32317
42317
52317
62317
72418
82418
92418
102418
112418
122518
132518
142518
152519
162519
172519
182619
192619
202619
212619
222620
232620
242620
252620
262720
272720
282720
292720
302720

How April really feels in Cao Bằng

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.

Cao Bằng 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
Jan16° / 10°6713.310.84.3
Feb18° / 12°5211.411.25.1
Mar21° / 15°891611.85.3
Apr25° / 19°11117.112.55.3
May28° / 21°21422.313.14.3
Jun29° / 23°29325.213.43.2
Jul30° / 23°30226.413.23.1
Aug30° / 23°26824.412.83.4
Sep29° / 22°15616.812.14.8
Oct26° / 19°871211.56.3
Nov22° / 15°699.710.96.6
Dec18° / 11°509.410.65.7

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 13% of April, with mostly cloudy or overcast conditions the remaining 75%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12179
22278
32278
42377
52377
62476
72476
82476
92575
102674
112674
122674
132674
142674
152773
162674
172674
182674
192674
202674
212674
222674
232674
242773
252674
262674
272674
282674
292674
302773

Chance of precipitation in April

Any precipitation

Cao Bằng gets around 111 mm of rain over 17.1 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 58% and peaks near 65% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
156
256
356
456
555
655
755
854
954
1054
1154
1254
1355
1455
1556
1656
1757
1857
1958
2059
2159
2260
2360
2461
2562
2662
2763
2864
2964
3065

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the muggy band about 35% of days. Sticky, muggy-or-worse air turns up on roughly 59% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1172227305
2162227306
3152126317
4142026328
5132025339
61219243410
71219233412
81119223513
91118213614
101117203616
111017193617
121016193719
13915183720
14915173722
15814173723
16814163725
17714163726
18613163827
19613163828
20513163829
21412163830
22412163831
23311163833
24310163734
25310163735
2629163637
2729163538
2829163439
2928163441
3018163342

Wind in April

Winds average 8 km/h in April, the windiest month of the year.

Across April, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
258calm
268calm
278calm
288calm
298calm
308calm

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 5:54 AM to 5:28 AM, and sunset from 6:06 PM to 6:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:546:06
212.25:536:06
312.25:526:06
412.35:516:07
512.35:506:07
612.35:496:07
712.35:486:08
812.45:476:08
912.45:466:08
1012.45:456:09
1112.45:446:09
1212.45:436:09
1312.55:426:10
1412.55:416:10
1512.55:406:11
1612.55:396:11
1712.55:396:11
1812.65:386:12
1912.65:376:12
2012.65:366:12
2112.65:356:13
2212.65:346:13
2312.75:336:14
2412.75:336:14
2512.75:326:14
2612.75:316:15
2712.75:306:15
2812.85:306:16
2912.85:296:16
3012.85:286:17

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 3.8 kWh/m².

For context, solar energy here swings from a low near 2.06 kWh/m² to a high of 4.43 kWh/m² in August across the year — April's 3.8 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
13.2Moderate
23.3Moderate
33.3Moderate
43.4Moderate
53.4Moderate
63.5Moderate
73.5Moderate
83.5Moderate
93.6Moderate
103.6Moderate
113.7Moderate
123.7Moderate
133.8Moderate
143.8Moderate
153.9Moderate
163.9Moderate
173.9Moderate
184.0Moderate
194.0Moderate
204.0Bright
214.0Bright
224.0Bright
234.1Bright
244.1Bright
254.1Bright
264.1Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in April

Hazard calendar for Cao Bằng

In seasonPeak

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

Cao Bằng'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 Cao Bằng?

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

5.3
Sightseeing
4th-best month of the year
4.8
Beach & pool
3rd-best month of the year

April is a reasonable time to visit Cao Bằng for sightseeing.

What to pack for Cao Bằng in April

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

In April, Cao Bằng sees daytime highs around 25°C and nights near 19°C. Pack rain gear. Worth having: light clothes. About 17 days see rain.

rain gearlight clothes

UV index in Cao Bằng 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 Cao Bằng peaks around June 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 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 22UV 13Dec 19UV 6
UV index (midday)Level
Jan6High
Feb8Very high
Mar10Extreme
Apr7Very high
May8Very high
Jun13Extreme
Jul12Extreme
Aug10Extreme
Sep9Very high
Oct7High
Nov6High
Dec6High

Air quality in Cao Bằng 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 Cao Bằng is worst in April — around 44 µg/m³ PM2.5 (poor), about 2.2× the cleanest month (July, 20 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorApr 944 µg/m³Jul 2020 µg/m³
PM2.5 (µg/m³)Level
Jan39Poor
Feb41Poor
Mar44Poor
Apr44Poor
May30Moderate
Jun23Moderate
Jul20Moderate
Aug21Moderate
Sep24Moderate
Oct28Moderate
Nov33Moderate
Dec39Poor
Location & terrain

Where is Cao Bằng?

Cao Bằng sits at 22.7°N, 106.3°E, 197 m above sea level, in Vietnam. The nearest listed city is Thị Trấn Nước Hai, 13 km away.

Lạng SơnThái NguyênThị Trấn Na DươngThị Trấn Đại Từ

Topography around Cao Bằng

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

Within 3 km, the terrain around Cao Bằng has significant variations in elevation — a maximum elevation change of 396 m around an average of 252 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 818 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,806 m.

The land around Cao Bằng is covered by trees (75%) within 3 km, trees (88%) within 16 km, and trees (88%) within 80 km.

3 km
396 m
16 km
818 m
80 km
1,806 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Thị Trấn Nước Hai 13 km · Thị Trấn Trùng Khánh 33 km · Thị Trấn Thất Khê 51 km · Bắc Kạn 72 km · Lạng Sơn 104 km · Thái Nguyên 126 km · Thị Trấn Na Dương 129 km · Thị Trấn Đại Từ 131 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 Cao Bằng (22.6657°, 106.2579°, elevation 197 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).