Climate guideThirty-year normals for Sơn La
Sơn La climate by month
Monsoon-influenced humid subtropical · CwaBest Jan–Feb · Dec
Annual mean22°day and night
Seasonal swing9°warmest vs coolest
Precipitation1,278 mm169 wet days a year
21.33° N, 103.92° EElevation 608 mUTC+7 · Indochina Time
When to goSơn La · weather score
Best timeJan–Feb · Dec
October: high / low26° / 18°
iSummary
What the weather is like
Sơn La has a monsoon-influenced humid subtropical climate (Köppen Cwa): a dry winter and a wetter summer.
The warmest month is May, when afternoons average 29° and nights 21°. January is the coolest month, with highs of 21° and lows of 11°. The difference between the warmest and the coolest month is about 9°, a small seasonal swing typical of places tempered by the sea.
About 1,278 mm of precipitation falls in an average year. August is the wettest month (232 mm, 25 wet days) and February the driest (21 mm, 4 wet days). Cloud cover ranges from 32% in April to 73% in June.
Compared with Hanoi, the capital, Sơn La is 1.7° cooler on a May afternoon and receives less precipitation over the year.
Year in figures
- Hottest afternoons
- 29° · May
- Coldest nights
- 11° · December
- Wettest month
- August
- Driest month
- February
- Clearest skies
- April · 32% cloud
- Longest day
- 13 h 25 min
- Shortest day
- 10 h 51 min
iiCharts
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columnsTemperature curve
Average high, lowDaylight
Hours between sunrise and sunset on the 15th of each monthiiiData table
Climate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 21° | 23° | 27° | 29° | 29° | 29° | 28° | 28° | 28° | 26° | 24° | 21° |
| Average low | 11° | 13° | 16° | 19° | 21° | 22° | 22° | 22° | 20° | 18° | 14° | 11° |
| Precipitation | 18 mm | 21 mm | 48 mm | 105 mm | 184 mm | 192 mm | 241 mm | 232 mm | 118 mm | 66 mm | 37 mm | 16 mm |
| Wet days (≥1 mm) | 5.2 | 3.9 | 9.2 | 15.2 | 20 | 22.9 | 24.3 | 24.9 | 18.4 | 12.8 | 7.5 | 4.5 |
| Cloud cover | 41% | 37% | 33% | 32% | 51% | 73% | 69% | 62% | 48% | 37% | 33% | 33% |
| Daylight | 10h 58 | 11h 27 | 12h 00 | 12h 38 | 13h 09 | 13h 25 | 13h 19 | 12h 53 | 12h 17 | 11h 41 | 11h 08 | 10h 51 |
| Month score | 83 | 88 | 70 | 50 | 41 | 34 | 37 | 40 | 48 | 62 | 81 | 88 |
ivMonth by month
Sơn La in every month
January83
21° / 11°
18 mm · 5.2 wet days
February88
23° / 13°
21 mm · 3.9 wet days
March70
27° / 16°
48 mm · 9.2 wet days
April50
29° / 19°
105 mm · 15.2 wet days
May41
29° / 21°
184 mm · 20 wet days
June34
29° / 22°
192 mm · 22.9 wet days
July37
28° / 22°
241 mm · 24.3 wet days
August40
28° / 22°
232 mm · 24.9 wet days
September48
28° / 20°
118 mm · 18.4 wet days
October62
26° / 18°
66 mm · 12.8 wet days
November81
24° / 14°
37 mm · 7.5 wet days
December88
21° / 11°
16 mm · 4.5 wet days