Vientiane weather in August

In August, Vientiane sees average daytime highs of 31°C and overnight lows near 25°C, with 401 mm of rain across 27.5 wet days and about 12.6 hours of daylight. It is the 7th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 2% of the time in August, and the air most often feels miserable.

Daylight stretches from about 12 h 48 min at the start of August to 12 h 24 min by month's end. Set against the rest of the year, August is Vientiane's 11th-clearest and 6th-windiest month. For the whole year in context, see Vientiane's year-round climate.

Daytime high
31°
7th warmest
Overnight low
25°
9th coldest
Rainfall
401 mm
27.5 wet days
Daylight
12 h 36 min
5:55 AM – 6:32 PM
Cloud cover
91%
11th clearest
Wind
5 km/h
6th windiest
Solar energy
4.17 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 August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical August day in Vientiane reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 34°C. Set against its neighbours, August runs on par with July and on par with September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13125
23125
33125
43125
53125
63125
73125
83125
93125
103125
113125
123125
133125
143125
153125
163125
173125
183125
193125
203125
213125
223125
233125
243125
253125
263125
273125
283125
293125
303125
313125

How August really feels in Vientiane

Once humidity and wind are folded in, August averages 31 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
31
31 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

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

Vientiane weather by month

How August compares with the rest of the year at a glance. August is the 7th-warmest and 1st-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 August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 5% of August, with mostly cloudy or overcast conditions the remaining 92%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1595
2595
3595
4595
5595
6595
7595
8694
9694
10694
11694
12793
13793
14793
15793
16892
17892
18892
19892
20892
21991
22991
231090
241090
251090
261189
271090
281090
291189
301189
311288

Chance of precipitation in August

Any precipitation

Vientiane gets around 401 mm of rain over 27.5 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 89% and peaks near 92% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
190
290
390
489
589
689
788
888
988
1088
1187
1287
1387
1487
1587
1687
1788
1888
1988
2088
2189
2289
2389
2490
2590
2690
2791
2891
2991
3091
3192

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the miserable band about 93% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
1991
2991
3991
4991
5991
61090
71090
8991
9991
10991
11991
12991
13991
14991
15892
16892
17892
18892
19793
20793
21694
22694
23694
24595
25595
26496
27496
28496
29397
30397
31397

Wind in August

Winds average 5 km/h in August.

Across August, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 12 h 48 min at the start of August to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over August. Sunrise moves from 5:51 AM to 5:58 AM, and sunset from 6:40 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:516:40
212.85:516:40
312.85:526:39
412.85:526:39
512.85:526:38
612.85:536:38
712.75:536:37
812.75:536:37
912.75:546:36
1012.75:546:36
1112.75:546:35
1212.75:546:35
1312.75:556:34
1412.65:556:33
1512.65:556:33
1612.65:556:32
1712.65:566:31
1812.65:566:31
1912.65:566:30
2012.65:566:29
2112.55:566:29
2212.55:576:28
2312.55:576:27
2412.55:576:26
2512.55:576:26
2612.55:586:25
2712.45:586:24
2812.45:586:23
2912.45:586:22
3012.45:586:22
3112.45:586:21

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.17 kWh/m² — the year's lowest.

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 — August's 4.17 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.1Bright
44.1Bright
54.1Bright
64.1Bright
74.1Bright
84.1Bright
94.2Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
314.2Bright
Planning a trip in August

Hazard calendar for Vientiane

In seasonPeak

In August, Vientiane sits inside its pacific typhoon and monsoon 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 August a good time to visit Vientiane?

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

2.4
Sightseeing
8th-best month of the year
3.7
Beach & pool
12th-best month of the year

August is a weaker month for outdoor sightseeing in Vientiane.

What to pack for Vientiane in August

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

In August, Vientiane sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 28 days see rain.

light clothesrain gear

UV index in Vientiane in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 13 (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 August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August 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
August 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).