Vieng Xai weather in August

In August, Vieng Xai sees average daytime highs of 28°C and overnight lows near 21°C, with 302 mm of rain across 26.8 wet days and about 12.7 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 3% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 12 h 54 min at the start of August to 12 h 24 min by month's end. Set against the rest of the year, August is Vieng Xai's 10th-clearest and 11th-windiest month. For the whole year in context, see Vieng Xai's year-round climate.

Daytime high: 28°; 4th warmest
Overnight low: 21°; 10th coldest
Rainfall: 302 mm; 26.8 wet days
Daylight: 12 h 42 min; 5:46 AM – 6:28 PM
Cloud cover: 88%; 10th clearest
Wind: 5 km/h; 11th windiest
Solar energy: 4.38 kWh/m²
Travel score: 3.6; out of 10

← July Vieng Xai year-round climate September →Best places to visit in August

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical August day in Vieng Xai reaches about 28°C in the afternoon and slips back to 21°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 31°C. Set against its neighbours, August runs on par with July and about 1°C warmer than September.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28
Avg low (°C)	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21

	Avg high (°C)	Avg low (°C)
1	28	21
2	28	21
3	28	21
4	28	21
5	28	21
6	28	21
7	28	21
8	28	21
9	28	21
10	28	21
11	28	21
12	28	21
13	28	21
14	28	21
15	28	21
16	28	21
17	28	21
18	28	21
19	28	21
20	28	21
21	28	21
22	28	21
23	28	21
24	28	21
25	28	21
26	28	21
27	28	21
28	28	21
29	28	21
30	28	21
31	28	21

How August really feels in Vieng Xai

Once humidity and wind are folded in, August 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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

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

Vieng Xai weather by month

How August compares with the rest of the year at a glance. August is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	20° / 11°	22	4.4	10.9	7.0
Feb	22° / 12°	14	3.8	11.3	7.6
Mar	25° / 15°	60	10.6	11.9	6.8
Apr	28° / 18°	109	17.7	12.5	5.1
May	29° / 20°	205	23.2	13	3.7
Jun	29° / 22°	201	24.2	13.2	3.2
Jul	29° / 22°	264	26.2	13.1	3.3
Aug	28° / 21°	302	26.8	12.7	3.6
Sep	27° / 20°	193	20.1	12.1	4.7
Oct	25° / 18°	91	14.2	11.5	6.1
Nov	23° / 15°	32	6.3	11	7.3
Dec	20° / 11°	19	4.2	10.8	7.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 8% of August, with mostly cloudy or overcast conditions the remaining 89%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	8	8	8	7	7	7	7	7	7	9	9	9	10	10	11	11	11	13	13	14	14	14	14	14	14	14	15	15	15	15	16
Cloudier (%)	92	92	92	93	93	93	93	93	93	91	91	91	90	90	89	89	89	87	87	86	86	86	86	86	86	86	85	85	85	85	84

	Clearer (%)	Cloudier (%)
1	8	92
2	8	92
3	8	92
4	7	93
5	7	93
6	7	93
7	7	93
8	7	93
9	7	93
10	9	91
11	9	91
12	9	91
13	10	90
14	10	90
15	11	89
16	11	89
17	11	89
18	13	87
19	13	87
20	14	86
21	14	86
22	14	86
23	14	86
24	14	86
25	14	86
26	14	86
27	15	85
28	15	85
29	15	85
30	15	85
31	16	84

Chance of precipitation in August

Any precipitation

Vieng Xai gets around 302 mm of rain over 26.8 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 86% and peaks near 91% on the wettest days. The odds ease toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	90	90	90	91	91	90	90	90	90	89	88	88	87	86	86	85	85	84	84	83	83	82	82	82	82	82	82	81	81	81	81

	Rain chance (%)
1	90
2	90
3	90
4	91
5	91
6	90
7	90
8	90
9	90
10	89
11	88
12	88
13	87
14	86
15	86
16	85
17	85
18	84
19	84
20	83
21	83
22	82
23	82
24	82
25	82
26	82
27	82
28	81
29	81
30	81
31	81

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the oppressive band about 60% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Muggy (%)	31	31	31	31	31	31	32	32	33	34	35	36	37	39	40	41	42	43	44	45	46	46	47	47	48	48	48	48	49	49	49
Oppressive (%)	69	69	69	69	69	69	68	68	67	66	65	64	63	61	60	59	58	57	56	55	54	54	53	53	52	52	52	52	51	51	51

	Muggy (%)	Oppressive (%)
1	31	69
2	31	69
3	31	69
4	31	69
5	31	69
6	31	69
7	32	68
8	32	68
9	33	67
10	34	66
11	35	65
12	36	64
13	37	63
14	39	61
15	40	60
16	41	59
17	42	58
18	43	57
19	44	56
20	45	55
21	46	54
22	46	54
23	47	53
24	47	53
25	48	52
26	48	52
27	48	52
28	48	52
29	49	51
30	49	51
31	49	51

Wind in August

Winds average 5 km/h in August.

Across August, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	4	4	4	4	4	4	4	4	4	4
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	5	calm
2	5	calm
3	5	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm
31	4	calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 12 h 54 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 30 minutes over August. Sunrise moves from 5:41 AM to 5:50 AM, and sunset from 6:37 PM to 6:16 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	12.9	12.9	12.9	12.9	12.9	12.9	12.8	12.8	12.8	12.8	12.8	12.8	12.8	12.7	12.7	12.7	12.7	12.7	12.6	12.6	12.6	12.6	12.6	12.6	12.5	12.5	12.5	12.5	12.5	12.4	12.4
Sunrise (AM)	5:41	5:41	5:42	5:42	5:42	5:43	5:43	5:44	5:44	5:44	5:45	5:45	5:45	5:46	5:46	5:46	5:46	5:47	5:47	5:47	5:48	5:48	5:48	5:48	5:49	5:49	5:49	5:50	5:50	5:50	5:50
Sunset (PM)	6:37	6:37	6:36	6:36	6:35	6:35	6:34	6:34	6:33	6:32	6:32	6:31	6:30	6:30	6:29	6:28	6:28	6:27	6:26	6:25	6:24	6:24	6:23	6:22	6:21	6:20	6:20	6:19	6:18	6:17	6:16

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.9	5:41	6:37
2	12.9	5:41	6:37
3	12.9	5:42	6:36
4	12.9	5:42	6:36
5	12.9	5:42	6:35
6	12.9	5:43	6:35
7	12.8	5:43	6:34
8	12.8	5:44	6:34
9	12.8	5:44	6:33
10	12.8	5:44	6:32
11	12.8	5:45	6:32
12	12.8	5:45	6:31
13	12.8	5:45	6:30
14	12.7	5:46	6:30
15	12.7	5:46	6:29
16	12.7	5:46	6:28
17	12.7	5:46	6:28
18	12.7	5:47	6:27
19	12.6	5:47	6:26
20	12.6	5:47	6:25
21	12.6	5:48	6:24
22	12.6	5:48	6:24
23	12.6	5:48	6:23
24	12.6	5:48	6:22
25	12.5	5:49	6:21
26	12.5	5:49	6:20
27	12.5	5:49	6:20
28	12.5	5:50	6:19
29	12.5	5:50	6:18
30	12.4	5:50	6:17
31	12.4	5:50	6:16

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.38 kWh/m².

For context, solar energy here swings from a low near 3.16 kWh/m² to a high of 5.2 kWh/m² in April across the year — August's 4.38 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.3
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.4	Bright
2	4.4	Bright
3	4.4	Bright
4	4.4	Bright
5	4.4	Bright
6	4.4	Bright
7	4.4	Bright
8	4.4	Bright
9	4.4	Bright
10	4.4	Bright
11	4.4	Bright
12	4.4	Bright
13	4.4	Bright
14	4.4	Bright
15	4.4	Bright
16	4.4	Bright
17	4.4	Bright
18	4.4	Bright
19	4.4	Bright
20	4.4	Bright
21	4.4	Bright
22	4.4	Bright
23	4.4	Bright
24	4.4	Bright
25	4.4	Bright
26	4.4	Bright
27	4.4	Bright
28	4.4	Bright
29	4.4	Bright
30	4.4	Bright
31	4.3	Bright

Planning a trip in August

Hazard calendar for Vieng Xai

In seasonPeak

In August, Vieng Xai sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Vieng Xai'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 August a good time to visit Vieng Xai?

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

3.6

Sightseeing

10th-best month of the year

4.1

Beach & pool

10th-best month of the year

August is a weaker month for outdoor sightseeing in Vieng Xai.

What to pack for Vieng Xai in August

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

In August, Vieng Xai sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. About 27 days see rain.

light clothesrain gear

UV index in Vieng Xai in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Vieng Xai peaks around August 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 7 (high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	8	9	10	9	10	14	13	14	10	9	8	7
Level	Very high	Very high	Very high	Very high	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	High

	UV index (midday)	Level
Jan	8	Very high
Feb	9	Very high
Mar	10	Very high
Apr	9	Very high
May	10	Extreme
Jun	14	Extreme
Jul	13	Extreme
Aug	14	Extreme
Sep	10	Very high
Oct	9	Very high
Nov	8	Very high
Dec	7	High

Air quality in Vieng Xai 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 Vieng Xai is worst in April — around 288 µg/m³ PM2.5 (very unhealthy), about 35.5× the cleanest month (August, 8 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	20	28	98	288	64	14	9	8	11	15	15	19
Level	Moderate	Moderate	Unhealthy	Very unhealthy	Unhealthy	Moderate	Good	Good	Good	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	20	Moderate
Feb	28	Moderate
Mar	98	Unhealthy
Apr	288	Very unhealthy
May	64	Unhealthy
Jun	14	Moderate
Jul	9	Good
Aug	8	Good
Sep	11	Good
Oct	15	Moderate
Nov	15	Moderate
Dec	19	Moderate

Location & terrain

Where is Vieng Xai?

Vieng Xai sits at 20.4°N, 104.2°E, 0 m above sea level, in Laos. The nearest listed city is Xam Nua, 19 km away.

Topography around Vieng Xai

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

Within 3 km, the terrain around Vieng Xai has large variations in elevation — a maximum elevation change of 661 m around an average of 915 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,259 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,998 m.

The land around Vieng Xai is covered by trees (65%) and grassland (25%) within 3 km, trees (86%) within 16 km, and trees (82%) within 80 km.

3 km

661 m

trees 65%

16 km

1,259 m

trees 86%

80 km

1,998 m

trees 82%

treesgrasslandcroplandartificial surfaceswater

← July Vieng Xai year-round climate September →Best places to visit in August

August weather nearby: Xam Nua 19 km · Bản Na Hỷ 99 km · Sơn La 107 km · Hòa Bình 125 km · Ít Ong 125 km · Thị Trấn Thuận Châu 127 km · Thị Trấn Lam Sơn 135 km · Nghĩa Lộ 136 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

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 Vieng Xai (20.4068°, 104.2238°, elevation 0 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).

	Avg high (°C)	Avg low (°C)
1	28	21
2	28	21
3	28	21
4	28	21
5	28	21
6	28	21
7	28	21
8	28	21
9	28	21
10	28	21
11	28	21
12	28	21
13	28	21
14	28	21
15	28	21
16	28	21
17	28	21
18	28	21
19	28	21
20	28	21
21	28	21
22	28	21
23	28	21
24	28	21
25	28	21
26	28	21
27	28	21
28	28	21
29	28	21
30	28	21
31	28	21

	Clearer (%)	Cloudier (%)
1	8	92
2	8	92
3	8	92
4	7	93
5	7	93
6	7	93
7	7	93
8	7	93
9	7	93
10	9	91
11	9	91
12	9	91
13	10	90
14	10	90
15	11	89
16	11	89
17	11	89
18	13	87
19	13	87
20	14	86
21	14	86
22	14	86
23	14	86
24	14	86
25	14	86
26	14	86
27	15	85
28	15	85
29	15	85
30	15	85
31	16	84

	Rain chance (%)
1	90
2	90
3	90
4	91
5	91
6	90
7	90
8	90
9	90
10	89
11	88
12	88
13	87
14	86
15	86
16	85
17	85
18	84
19	84
20	83
21	83
22	82
23	82
24	82
25	82
26	82
27	82
28	81
29	81
30	81
31	81

	Muggy (%)	Oppressive (%)
1	31	69
2	31	69
3	31	69
4	31	69
5	31	69
6	31	69
7	32	68
8	32	68
9	33	67
10	34	66
11	35	65
12	36	64
13	37	63
14	39	61
15	40	60
16	41	59
17	42	58
18	43	57
19	44	56
20	45	55
21	46	54
22	46	54
23	47	53
24	47	53
25	48	52
26	48	52
27	48	52
28	48	52
29	49	51
30	49	51
31	49	51

	Avg high (°C)	Avg low (°C)
1	28	21
2	28	21
3	28	21
4	28	21
5	28	21
6	28	21
7	28	21
8	28	21
9	28	21
10	28	21
11	28	21
12	28	21
13	28	21
14	28	21
15	28	21
16	28	21
17	28	21
18	28	21
19	28	21
20	28	21
21	28	21
22	28	21
23	28	21
24	28	21
25	28	21
26	28	21
27	28	21
28	28	21
29	28	21
30	28	21
31	28	21

	Clearer (%)	Cloudier (%)
1	8	92
2	8	92
3	8	92
4	7	93
5	7	93
6	7	93
7	7	93
8	7	93
9	7	93
10	9	91
11	9	91
12	9	91
13	10	90
14	10	90
15	11	89
16	11	89
17	11	89
18	13	87
19	13	87
20	14	86
21	14	86
22	14	86
23	14	86
24	14	86
25	14	86
26	14	86
27	15	85
28	15	85
29	15	85
30	15	85
31	16	84

	Rain chance (%)
1	90
2	90
3	90
4	91
5	91
6	90
7	90
8	90
9	90
10	89
11	88
12	88
13	87
14	86
15	86
16	85
17	85
18	84
19	84
20	83
21	83
22	82
23	82
24	82
25	82
26	82
27	82
28	81
29	81
30	81
31	81

	Muggy (%)	Oppressive (%)
1	31	69
2	31	69
3	31	69
4	31	69
5	31	69
6	31	69
7	32	68
8	32	68
9	33	67
10	34	66
11	35	65
12	36	64
13	37	63
14	39	61
15	40	60
16	41	59
17	42	58
18	43	57
19	44	56
20	45	55
21	46	54
22	46	54
23	47	53
24	47	53
25	48	52
26	48	52
27	48	52
28	48	52
29	49	51
30	49	51
31	49	51

	Avg high (°C)	Avg low (°C)
1	28	21
2	28	21
3	28	21
4	28	21
5	28	21
6	28	21
7	28	21
8	28	21
9	28	21
10	28	21
11	28	21
12	28	21
13	28	21
14	28	21
15	28	21
16	28	21
17	28	21
18	28	21
19	28	21
20	28	21
21	28	21
22	28	21
23	28	21
24	28	21
25	28	21
26	28	21
27	28	21
28	28	21
29	28	21
30	28	21
31	28	21

	Clearer (%)	Cloudier (%)
1	8	92
2	8	92
3	8	92
4	7	93
5	7	93
6	7	93
7	7	93
8	7	93
9	7	93
10	9	91
11	9	91
12	9	91
13	10	90
14	10	90
15	11	89
16	11	89
17	11	89
18	13	87
19	13	87
20	14	86
21	14	86
22	14	86
23	14	86
24	14	86
25	14	86
26	14	86
27	15	85
28	15	85
29	15	85
30	15	85
31	16	84

	Rain chance (%)
1	90
2	90
3	90
4	91
5	91
6	90
7	90
8	90
9	90
10	89
11	88
12	88
13	87
14	86
15	86
16	85
17	85
18	84
19	84
20	83
21	83
22	82
23	82
24	82
25	82
26	82
27	82
28	81
29	81
30	81
31	81

	Muggy (%)	Oppressive (%)
1	31	69
2	31	69
3	31	69
4	31	69
5	31	69
6	31	69
7	32	68
8	32	68
9	33	67
10	34	66
11	35	65
12	36	64
13	37	63
14	39	61
15	40	60
16	41	59
17	42	58
18	43	57
19	44	56
20	45	55
21	46	54
22	46	54
23	47	53
24	47	53
25	48	52
26	48	52
27	48	52
28	48	52
29	49	51
30	49	51
31	49	51