Vientiane weather in April

In April, Vientiane sees average daytime highs of 35°C and overnight lows near 25°C, with 75 mm of rain across 11.9 wet days and about 12.4 hours of daylight. It is the 1st-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 35°C through the month. The sky is clear or mostly clear about 42% 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 36 min by month's end. Set against the rest of the year, April is Vientiane's 6th-clearest and 4th-windiest month. For the whole year in context, see Vientiane's year-round climate.

Daytime high
35°
1st warmest
Overnight low
25°
7th coldest
Rainfall
75 mm
11.9 wet days
Daylight
12 h 24 min
5:58 AM – 6:22 PM
Cloud cover
51%
6th clearest
Wind
6 km/h
4th windiest
Solar energy
6.03 kWh/m²
Travel score
2.4
out of 10

Vientiane is capital of Laos.

Air quality
High
PM2.5 25.8 µg/m³ · 2019
Density
215/km²
people per km²
Founded
1560

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

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 35°C through the month.

A typical April day in Vientiane reaches about 35°C in the afternoon and slips back to 25°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 39°C. Set against its neighbours, April runs about 1°C warmer than March and about 2°C warmer than May.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13423
23524
33524
43524
53524
63524
73524
83524
93524
103524
113524
123524
133524
143525
153525
163525
173525
183525
193525
203525
213525
223525
233525
243525
253525
263525
273525
283525
293525
303525

How April really feels in Vientiane

Once humidity and wind are folded in, April averages 30 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
30
25 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

The story in April is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Vientiane weather by month

How April compares with the rest of the year at a glance. April is the 1st-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 17°111.7116.9
Feb31° / 19°152.211.45.4
Mar34° / 22°366.211.93.5
Apr35° / 25°7511.912.42.4
May33° / 25°26223.412.82.2
Jun32° / 26°31625.113.12.2
Jul32° / 26°37226.5132.4
Aug31° / 25°40127.512.62.4
Sep32° / 25°30024.712.12.7
Oct31° / 24°10111.911.64.2
Nov30° / 21°22311.25.8
Dec29° / 18°81.210.97.2

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 21% of April, with mostly cloudy or overcast conditions the remaining 37%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17129
27129
37129
47129
57030
67030
76931
86832
96832
106733
116634
126535
136535
146436
156436
166436
176337
186238
196238
206139
216139
226040
235842
245743
255743
265644
275545
285446
295248
305050

Chance of precipitation in April

Any precipitation

Vientiane gets around 75 mm of rain over 11.9 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 40% and peaks near 54% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
131
231
331
432
532
633
733
834
934
1035
1135
1236
1337
1437
1538
1639
1740
1840
1942
2043
2144
2245
2346
2447
2548
2649
2750
2851
2953
3054

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 58% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
13627577
23627577
32526598
42525599
524245911
624235912
714226013
814216014
913206115
1013196116
1113186117
1213176118
1313156219
1413156021
1503146122
1602136223
1702126224
1802126125
1902116126
2001116127
2101106029
2201105930
230195931
240195733
250095734
260085636
270085438
280085240
290075142
300075044

Wind in April

Winds average 6 km/h in April.

Across April, daily wind ranges from about 5 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
275calm
285calm
295calm
305calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 12 min at the start of April to 12 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over April. Sunrise moves from 6:10 AM to 5:48 AM, and sunset from 6:19 PM to 6:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:106:19
212.26:096:19
312.26:086:19
412.26:076:19
512.26:066:20
612.26:066:20
712.36:056:20
812.36:046:20
912.36:036:20
1012.36:026:21
1112.36:016:21
1212.36:016:21
1312.46:006:21
1412.45:596:22
1512.45:586:22
1612.45:586:22
1712.45:576:22
1812.45:566:23
1912.55:556:23
2012.55:556:23
2112.55:546:23
2212.55:536:24
2312.55:536:24
2412.55:526:24
2512.65:516:24
2612.65:516:25
2712.65:506:25
2812.65:496:25
2912.65:496:25
3012.65:486:26

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 6.03 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.17 kWh/m² to a high of 6.03 kWh/m² in April across the year — April's 6.03 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.0Bright
26.0Bright
36.0Bright
46.0Intense
56.0Intense
66.0Intense
76.0Intense
86.0Intense
96.0Intense
106.0Intense
116.0Intense
126.1Intense
136.1Intense
146.0Intense
156.0Intense
166.0Intense
176.0Intense
186.0Intense
196.0Intense
206.0Intense
216.0Intense
226.0Bright
236.0Bright
246.0Bright
255.9Bright
265.9Bright
275.9Bright
285.9Bright
295.8Bright
305.8Bright
Planning a trip in April

Hazard calendar for Vientiane

In seasonPeak

In April, Vientiane sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Vientiane sits in the Pacific typhoon belt; the season peaks July–October.

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

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

Is April a good time to visit Vientiane?

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

2.4
Sightseeing
8th-best month of the year
5.3
Beach & pool
7th-best month of the year

April is a weaker month for outdoor sightseeing in Vientiane.

What to pack for Vientiane in April

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

In April, Vientiane sees daytime highs around 35°C and nights near 25°C. Pack light clothes and sun protection. Worth having: rain gear. About 12 days see rain.

light clothessun protectionrain gear

UV index in Vientiane in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Vientiane peaks around August 11 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 11UV 13Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar12Extreme
Apr10Extreme
May11Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Extreme
Nov8Very high
Dec7Very high

Air quality in Vientiane 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 Vientiane is worst in March — around 56 µg/m³ PM2.5 (unhealthy), about 3.4× the cleanest month (July, 16 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Vientiane's WHO annual average of 25.8 µg/m³.

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorPoorModerateMar 2355 µg/m³Jul 2116 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb32Moderate
Mar56Unhealthy
Apr53Poor
May23Moderate
Jun17Moderate
Jul16Moderate
Aug17Moderate
Sep17Moderate
Oct19Moderate
Nov18Moderate
Dec19Moderate
Location & terrain

Where is Vientiane?

Vientiane sits at 18.0°N, 102.6°E, 174 m above sea level, in Laos. The nearest listed city is Tha Bo, 13 km away.

Kut ChapPhon CharoenUdon ThaniBan DungNa Klang

Topography around Vientiane

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

Within 3 km, the terrain around Vientiane has only modest variations in elevation — a maximum elevation change of 33 m around an average of 171 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 74 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,487 m.

The land around Vientiane is covered by artificial surfaces (53%) within 3 km, cropland (36%) and trees (34%) within 16 km, and trees (57%) and cropland (34%) within 80 km.

3 km
33 m
16 km
74 m
80 km
1,487 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Tha Bo 13 km · Nong Khai 18 km · Nam Som 49 km · Kut Chap 60 km · Phon Charoen 60 km · Udon Thani 64 km · Ban Dung 76 km · Na Klang 85 km

Laos travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C / E / F
230 V · 50 Hz
Prices
≈ 23% of US
price level, 2025
GDP per capita
$2,325
2025
Happiness
5.5 / 10
World Happiness, 2025
Safe drinking water
35%
of population, 2024
Road deaths
17.9
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Low
EF EPI 461
Religion
Buddhist 65%none 31%other/not stated 2%Christian 2%

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 Vientiane (17.9667°, 102.6°, elevation 174 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).