Sơn La weather in August

In August, Sơn La sees average daytime highs of 29°C and overnight lows near 22°C, with 283 mm of rain across 25.3 wet days and about 12.7 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 7% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 13 hours at the start of August to 12 h 24 min by month's end. Set against the rest of the year, August is Sơn La's 10th-clearest and 11th-windiest month. For the whole year in context, see Sơn La's year-round climate.

Daytime high: 29°; 3rd warmest
Overnight low: 22°; 10th coldest
Rainfall: 283 mm; 25.3 wet days
Daylight: 12 h 42 min; 5:46 AM – 6:31 PM
Cloud cover: 84%; 10th clearest
Wind: 4 km/h; 11th windiest
Solar energy: 4.4 kWh/m²
Travel score: 3.4; out of 10

Sơn La is the old provincial capital of Son La province, Vietnam.

Density: 328/km²; people per km²

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

← July Sơn La 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 29°C through the month.

A typical August day in Sơn La reaches about 29°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 31°C. Set against its neighbours, August runs on par with July and on par with 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)	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29
Avg low (°C)	23	23	23	23	23	23	23	23	23	23	23	23	23	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22

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

How August really feels in Sơn La

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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

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

Sơn La weather by month

How August compares with the rest of the year at a glance. August is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	21° / 12°	24	4	10.8	7.3
Feb	23° / 13°	19	3.6	11.3	7.9
Mar	27° / 16°	50	7.1	11.8	7.1
Apr	29° / 19°	72	12.8	12.5	5.2
May	30° / 22°	147	19.3	13	3.7
Jun	30° / 23°	209	23	13.3	3.2
Jul	29° / 23°	288	24.5	13.2	3.4
Aug	29° / 22°	283	25.3	12.7	3.4
Sep	29° / 21°	150	17.5	12.1	4.4
Oct	27° / 19°	49	8.3	11.5	6.6
Nov	25° / 16°	27	4.5	11	7.8
Dec	22° / 12°	23	3.6	10.7	7.6

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 7% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 9% of August, with mostly cloudy or overcast conditions the remaining 84%.

	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 (%)	12	12	11	11	11	11	11	11	11	12	12	12	14	14	15	16	16	17	18	19	19	20	21	21	22	22	22	22	22	22	23
Cloudier (%)	88	88	89	89	89	89	89	89	89	88	88	88	86	86	85	84	84	83	82	81	81	80	79	79	78	78	78	78	78	78	77

	Clearer (%)	Cloudier (%)
1	12	88
2	12	88
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	12	88
11	12	88
12	12	88
13	14	86
14	14	86
15	15	85
16	16	84
17	16	84
18	17	83
19	18	82
20	19	81
21	19	81
22	20	80
23	21	79
24	21	79
25	22	78
26	22	78
27	22	78
28	22	78
29	22	78
30	22	78
31	23	77

Chance of precipitation in August

Any precipitation

Sơn La gets around 283 mm of rain over 25.3 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 80% and peaks near 85% 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 (%)	83	83	84	84	84	85	85	85	85	85	84	84	83	82	82	81	80	80	79	79	78	78	77	77	77	76	76	75	75	75	74

	Rain chance (%)
1	83
2	83
3	84
4	84
5	84
6	85
7	85
8	85
9	85
10	85
11	84
12	84
13	83
14	82
15	82
16	81
17	80
18	80
19	79
20	79
21	78
22	78
23	77
24	77
25	77
26	76
27	76
28	75
29	75
30	75
31	74

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 97% 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 (%)	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	2	2	2	2	3	3	3	4	4	4	5	5	6	7	8	9
Oppressive (%)	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	98	98	98	98	97	97	97	96	96	96	95	95	94	93	92	91

	Muggy (%)	Oppressive (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	1	99
9	1	99
10	1	99
11	1	99
12	1	99
13	1	99
14	1	99
15	1	99
16	2	98
17	2	98
18	2	98
19	2	98
20	3	97
21	3	97
22	3	97
23	4	96
24	4	96
25	4	96
26	5	95
27	5	95
28	6	94
29	7	93
30	8	92
31	9	91

Wind in August

Winds average 4 km/h in August.

Across August, daily wind ranges from about 4 km/h on the calmest days to 4 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)	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
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	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	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 13 hours 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 36 minutes over August. Sunrise moves from 5:41 AM to 5:51 AM, and sunset from 6:40 PM to 6:18 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)	13.0	13.0	13.0	12.9	12.9	12.9	12.9	12.9	12.9	12.8	12.8	12.8	12.8	12.8	12.8	12.7	12.7	12.7	12.7	12.7	12.6	12.6	12.6	12.6	12.6	12.5	12.5	12.5	12.5	12.5	12.4
Sunrise (AM)	5:41	5:41	5:42	5:42	5:42	5:43	5:43	5:43	5:44	5:44	5:45	5:45	5:45	5:46	5:46	5:46	5:47	5:47	5:47	5:48	5:48	5:48	5:49	5:49	5:49	5:49	5:50	5:50	5:50	5:51	5:51
Sunset (PM)	6:40	6:39	6:39	6:38	6:38	6:37	6:37	6:36	6:35	6:35	6:34	6:33	6:33	6:32	6:31	6:31	6:30	6:29	6:28	6:27	6:27	6:26	6:25	6:24	6:23	6:22	6:21	6:21	6:20	6:19	6:18

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.0	5:41	6:40
2	13.0	5:41	6:39
3	13.0	5:42	6:39
4	12.9	5:42	6:38
5	12.9	5:42	6:38
6	12.9	5:43	6:37
7	12.9	5:43	6:37
8	12.9	5:43	6:36
9	12.9	5:44	6:35
10	12.8	5:44	6:35
11	12.8	5:45	6:34
12	12.8	5:45	6:33
13	12.8	5:45	6:33
14	12.8	5:46	6:32
15	12.8	5:46	6:31
16	12.7	5:46	6:31
17	12.7	5:47	6:30
18	12.7	5:47	6:29
19	12.7	5:47	6:28
20	12.7	5:48	6:27
21	12.6	5:48	6:27
22	12.6	5:48	6:26
23	12.6	5:49	6:25
24	12.6	5:49	6:24
25	12.6	5:49	6:23
26	12.5	5:49	6:22
27	12.5	5:50	6:21
28	12.5	5:50	6:21
29	12.5	5:50	6:20
30	12.5	5:51	6:19
31	12.4	5:51	6:18

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.4 kWh/m².

For context, solar energy here swings from a low near 3.14 kWh/m² to a high of 5.26 kWh/m² in April across the year — August's 4.4 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	4.3	4.3	4.3	4.3	4.3	4.3	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.4	4.4
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	4.3	Bright
10	4.3	Bright
11	4.3	Bright
12	4.3	Bright
13	4.3	Bright
14	4.3	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	4.5	Bright
24	4.5	Bright
25	4.5	Bright
26	4.5	Bright
27	4.5	Bright
28	4.5	Bright
29	4.5	Bright
30	4.4	Bright
31	4.4	Bright

Planning a trip in August

Hazard calendar for Sơn La

In seasonPeak

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

Sơn La'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 Sơn La?

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

3.4

Sightseeing

10th-best month of the year

4.5

Beach & pool

10th-best month of the year

August is a weaker month for outdoor sightseeing in Sơn La.

What to pack for Sơn La in August

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

In August, Sơn La sees daytime highs around 29°C and nights near 22°C. Pack light clothes and rain gear. About 25 days see rain.

light clothesrain gear

UV index in Sơn La 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 Sơn La peaks around June 20 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 6 (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)	7	9	11	9	11	14	13	13	9	9	8	6
Level	Very high	Very high	Extreme	Very high	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	High

	UV index (midday)	Level
Jan	7	Very high
Feb	9	Very high
Mar	11	Extreme
Apr	9	Very high
May	11	Extreme
Jun	14	Extreme
Jul	13	Extreme
Aug	13	Extreme
Sep	9	Very high
Oct	9	Very high
Nov	8	Very high
Dec	6	High

Air quality in Sơn La 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 Sơn La is worst in April — around 151 µg/m³ PM2.5 (very unhealthy), about 12.9× the cleanest month (August, 12 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)	32	38	67	151	58	14	12	12	16	23	26	31
Level	Moderate	Poor	Unhealthy	Very unhealthy	Unhealthy	Moderate	Good	Good	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	32	Moderate
Feb	38	Poor
Mar	67	Unhealthy
Apr	151	Very unhealthy
May	58	Unhealthy
Jun	14	Moderate
Jul	12	Good
Aug	12	Good
Sep	16	Moderate
Oct	23	Moderate
Nov	26	Moderate
Dec	31	Moderate

Location & terrain

Where is Sơn La?

Sơn La sits at 21.3°N, 103.9°E, 608 m above sea level, in Vietnam. The nearest listed city is Ít Ong, 24 km away.

Topography around Sơn La

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

Within 3 km, the terrain around Sơn La has significant variations in elevation — a maximum elevation change of 348 m around an average of 674 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,404 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,830 m.

The land around Sơn La is covered by trees (59%) within 3 km, trees (69%) and grassland (21%) within 16 km, and trees (68%) and grassland (27%) within 80 km.

3 km

348 m

trees 59%

16 km

1,404 m

trees 69%

80 km

2,830 m

trees 68%

treesgrasslandcroplandartificial surfacesbare terrainwater

← July Sơn La year-round climate September →Best places to visit in August

August weather nearby: Ít Ong 24 km · Thị Trấn Thuận Châu 27 km · Nghĩa Lộ 69 km · Dien Bien Phu 93 km · Xam Nua 102 km · Vieng Xai 107 km · Mường Lay 111 km · Yên Bái 112 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

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 Sơn La (21.3256°, 103.9188°, elevation 608 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	29	23
2	29	23
3	29	23
4	29	23
5	29	23
6	29	23
7	29	23
8	29	23
9	29	23
10	29	23
11	29	23
12	29	23
13	29	23
14	29	22
15	29	22
16	29	22
17	29	22
18	29	22
19	29	22
20	29	22
21	29	22
22	29	22
23	29	22
24	29	22
25	29	22
26	29	22
27	29	22
28	29	22
29	29	22
30	29	22
31	29	22

	Clearer (%)	Cloudier (%)
1	12	88
2	12	88
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	12	88
11	12	88
12	12	88
13	14	86
14	14	86
15	15	85
16	16	84
17	16	84
18	17	83
19	18	82
20	19	81
21	19	81
22	20	80
23	21	79
24	21	79
25	22	78
26	22	78
27	22	78
28	22	78
29	22	78
30	22	78
31	23	77

	Rain chance (%)
1	83
2	83
3	84
4	84
5	84
6	85
7	85
8	85
9	85
10	85
11	84
12	84
13	83
14	82
15	82
16	81
17	80
18	80
19	79
20	79
21	78
22	78
23	77
24	77
25	77
26	76
27	76
28	75
29	75
30	75
31	74

	Muggy (%)	Oppressive (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	1	99
9	1	99
10	1	99
11	1	99
12	1	99
13	1	99
14	1	99
15	1	99
16	2	98
17	2	98
18	2	98
19	2	98
20	3	97
21	3	97
22	3	97
23	4	96
24	4	96
25	4	96
26	5	95
27	5	95
28	6	94
29	7	93
30	8	92
31	9	91

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

	Clearer (%)	Cloudier (%)
1	12	88
2	12	88
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	12	88
11	12	88
12	12	88
13	14	86
14	14	86
15	15	85
16	16	84
17	16	84
18	17	83
19	18	82
20	19	81
21	19	81
22	20	80
23	21	79
24	21	79
25	22	78
26	22	78
27	22	78
28	22	78
29	22	78
30	22	78
31	23	77

	Rain chance (%)
1	83
2	83
3	84
4	84
5	84
6	85
7	85
8	85
9	85
10	85
11	84
12	84
13	83
14	82
15	82
16	81
17	80
18	80
19	79
20	79
21	78
22	78
23	77
24	77
25	77
26	76
27	76
28	75
29	75
30	75
31	74

	Muggy (%)	Oppressive (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	1	99
9	1	99
10	1	99
11	1	99
12	1	99
13	1	99
14	1	99
15	1	99
16	2	98
17	2	98
18	2	98
19	2	98
20	3	97
21	3	97
22	3	97
23	4	96
24	4	96
25	4	96
26	5	95
27	5	95
28	6	94
29	7	93
30	8	92
31	9	91

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

	Clearer (%)	Cloudier (%)
1	12	88
2	12	88
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	12	88
11	12	88
12	12	88
13	14	86
14	14	86
15	15	85
16	16	84
17	16	84
18	17	83
19	18	82
20	19	81
21	19	81
22	20	80
23	21	79
24	21	79
25	22	78
26	22	78
27	22	78
28	22	78
29	22	78
30	22	78
31	23	77

	Rain chance (%)
1	83
2	83
3	84
4	84
5	84
6	85
7	85
8	85
9	85
10	85
11	84
12	84
13	83
14	82
15	82
16	81
17	80
18	80
19	79
20	79
21	78
22	78
23	77
24	77
25	77
26	76
27	76
28	75
29	75
30	75
31	74

	Muggy (%)	Oppressive (%)
1	1	99
2	1	99
3	1	99
4	1	99
5	1	99
6	1	99
7	1	99
8	1	99
9	1	99
10	1	99
11	1	99
12	1	99
13	1	99
14	1	99
15	1	99
16	2	98
17	2	98
18	2	98
19	2	98
20	3	97
21	3	97
22	3	97
23	4	96
24	4	96
25	4	96
26	5	95
27	5	95
28	6	94
29	7	93
30	8	92
31	9	91