Sơn La weather in July

In July, Sơn La sees average daytime highs of 29°C and overnight lows near 23°C, with 288 mm of rain across 24.5 wet days and about 13.2 hours of daylight. It is the 3rd-warmest and 1st-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 4% of the time in July, and the air most often feels oppressive.

Daylight stretches from about 13 h 18 min at the start of July to 13 hours by month's end. Set against the rest of the year, July is Sơn La's 11th-clearest and 10th-windiest month. For the whole year in context, see Sơn La's year-round climate.

Daytime high
29°
3rd warmest
Overnight low
23°
11th coldest
Rainfall
288 mm
24.5 wet days
Daylight
13 h 12 min
5:34 AM – 6:45 PM
Cloud cover
90%
11th clearest
Wind
4 km/h
10th 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.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical July day in Sơn La reaches about 29°C in the afternoon and slips back to 23°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 32°C. Set against its neighbours, July runs about 1°C cooler than June and on par with August.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12923
22923
32923
42923
52923
62923
72923
82923
92923
102923
112923
122923
132923
142923
152923
162923
172923
182923
192923
202923
212923
222923
232923
242923
252923
262923
272923
282923
292923
302923
312923

How July really feels in Sơn La

Once humidity and wind are folded in, July 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
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Sơn La weather by month

How July compares with the rest of the year at a glance. July is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan21° / 12°24410.87.3
Feb23° / 13°193.611.37.9
Mar27° / 16°507.111.87.1
Apr29° / 19°7212.812.55.2
May30° / 22°14719.3133.7
Jun30° / 23°2092313.33.2
Jul29° / 23°28824.513.23.4
Aug29° / 22°28325.312.73.4
Sep29° / 21°15017.512.14.4
Oct27° / 19°498.311.56.6
Nov25° / 16°274.5117.8
Dec22° / 12°233.610.77.6

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 5% of July, with mostly cloudy or overcast conditions the remaining 91%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1793
2793
3892
4892
5991
6991
7991
8991
9991
10991
11991
12991
13991
14991
15991
16991
17991
18991
19991
201090
211090
221090
231090
241189
251189
261189
271189
281189
291288
301288
311288

Chance of precipitation in July

Any precipitation

Sơn La gets around 288 mm of rain over 24.5 wet days in July, the wettest month. 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 82% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
178
278
378
478
578
678
778
878
979
1079
1179
1280
1380
1480
1580
1680
1780
1880
1980
2080
2180
2280
2380
2480
2580
2680
2780
2881
2981
3081
3182

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the oppressive band about 97% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
12971
22971
32971
42971
52971
62971
72971
82971
92971
102971
112971
122971
132971
142971
152971
162971
172971
182971
192971
202971
212971
222971
232971
242971
252980
262980
272980
282980
292980
302980
311990

Wind in July

Winds average 4 km/h in July.

Across July, 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.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 13 h 18 min at the start of July to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over July. Sunrise moves from 5:29 AM to 5:40 AM, and sunset from 6:46 PM to 6:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:296:46
213.35:296:46
313.35:306:46
413.35:306:46
513.35:306:46
613.35:316:46
713.35:316:46
813.25:316:46
913.25:326:46
1013.25:326:46
1113.25:336:46
1213.25:336:46
1313.25:336:46
1413.25:346:46
1513.25:346:46
1613.25:346:45
1713.25:356:45
1813.25:356:45
1913.25:366:45
2013.15:366:45
2113.15:366:44
2213.15:376:44
2313.15:376:44
2413.15:386:43
2513.15:386:43
2613.15:386:43
2713.15:396:42
2813.05:396:42
2913.05:406:41
3013.05:406:41
3113.05:406:40

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, 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 — July's 4.4 kWh/m² falls in the middle.

012345151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.4Bright
214.4Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.4Bright
294.4Bright
304.4Bright
314.4Bright
Planning a trip in July

Hazard calendar for Sơn La

In seasonPeak

In July, 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 July a good time to visit Sơn La?

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

3.4
Sightseeing
10th-best month of the year
4.4
Beach & pool
12th-best month of the year

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

What to pack for Sơn La in July

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

In July, Sơn La sees daytime highs around 29°C and nights near 23°C. Pack light clothes and rain gear. About 25 days see rain.

light clothesrain gear

UV index in Sơn La in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highExtremeVery highHighJun 20UV 13Dec 18UV 6
UV index (midday)Level
Jan7Very high
Feb9Very high
Mar11Extreme
Apr9Very high
May11Extreme
Jun14Extreme
Jul13Extreme
Aug13Extreme
Sep9Very high
Oct9Very high
Nov8Very high
Dec6High

Air quality in Sơn La in July

GoodModeratePoorUnhealthyVery unhealthy

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

0306090120150JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorUnhealthyModerateGoodModerateApr 16140 µg/m³Aug 912 µg/m³
PM2.5 (µg/m³)Level
Jan32Moderate
Feb38Poor
Mar67Unhealthy
Apr151Very unhealthy
May58Unhealthy
Jun14Moderate
Jul12Good
Aug12Good
Sep16Moderate
Oct23Moderate
Nov26Moderate
Dec31Moderate
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.

Dien Bien PhuXam NuaVieng XaiMường LayYên Bái

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
16 km
1,404 m
80 km
2,830 m
treesgrasslandcroplandartificial surfacesbare terrainwater
July 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
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 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).