Lạng Sơn weather in October
In October, Lạng Sơn sees average daytime highs of 27°C and overnight lows near 20°C, with 75 mm of rain across 10.9 wet days and about 11.5 hours of daylight. It is the 6th-warmest and 8th-wettest month of the year here.
Highs ease over the month, from about 28°C in the first days to 26°C by the end. The sky is clear or mostly clear about 33% of the time in October, and the air most often feels muggy.
Daylight stretches from about 11 h 48 min at the start of October to 11 h 12 min by month's end. Set against the rest of the year, October is Lạng Sơn's 1st-clearest and 8th-windiest month. For the whole year in context, see Lạng Sơn's year-round climate.
- Daytime high
- 27°
- 6th warmest
- Overnight low
- 20°
- 7th coldest
- Rainfall
- 75 mm
- 10.9 wet days
- Daylight
- 11 h 30 min
- 5:53 AM – 5:23 PM
- Cloud cover
- 55%
- 1st clearest
- Wind
- 10 km/h
- 8th windiest
- Solar energy
- 4.15 kWh/m²
- Travel score
- 6.4
- out of 10
Lạng Sơn is provincial city of Vietnam.
- Density
- 2,533/km²
- people per km²
- Founded
- 2002
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in October
Highs ease over the month, from about 28°C in the first days to 26°C by the end.
A typical October day in Lạng Sơn reaches about 27°C in the afternoon and slips back to 20°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 30°C. Set against its neighbours, October runs about 3°C cooler than September and about 4°C warmer than November.
| 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 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 |
| Avg low (°C) | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 28 | 22 |
| 2 | 28 | 22 |
| 3 | 28 | 22 |
| 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 | 27 | 21 |
| 13 | 27 | 21 |
| 14 | 27 | 20 |
| 15 | 27 | 20 |
| 16 | 27 | 20 |
| 17 | 27 | 20 |
| 18 | 27 | 20 |
| 19 | 27 | 20 |
| 20 | 27 | 20 |
| 21 | 26 | 20 |
| 22 | 26 | 19 |
| 23 | 26 | 19 |
| 24 | 26 | 19 |
| 25 | 26 | 19 |
| 26 | 26 | 19 |
| 27 | 26 | 19 |
| 28 | 26 | 19 |
| 29 | 26 | 18 |
| 30 | 26 | 18 |
| 31 | 25 | 18 |
How October really feels in Lạng Sơn
Once humidity and wind are folded in, October 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.
October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Lạng Sơn weather by month
How October compares with the rest of the year at a glance. October is the 6th-warmest and 8th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 17° / 11° | 57 | 11.1 | 10.8 | 5.1 |
| Feb | 19° / 13° | 44 | 10.1 | 11.2 | 5.6 |
| Mar | 21° / 16° | 79 | 14.4 | 11.8 | 5.5 |
| Apr | 26° / 20° | 97 | 14.9 | 12.5 | 5.5 |
| May | 29° / 23° | 221 | 21.2 | 13 | 4.0 |
| Jun | 30° / 25° | 257 | 23.6 | 13.3 | 3.0 |
| Jul | 31° / 25° | 270 | 24.9 | 13.2 | 2.9 |
| Aug | 30° / 24° | 285 | 25.3 | 12.7 | 3.0 |
| Sep | 29° / 23° | 164 | 18.3 | 12.1 | 4.2 |
| Oct | 27° / 20° | 75 | 10.9 | 11.5 | 6.4 |
| Nov | 23° / 16° | 50 | 7.9 | 11 | 7.1 |
| Dec | 19° / 12° | 45 | 8.2 | 10.7 | 6.3 |
Cloud cover in October
The sky is clear or mostly clear about 33% of the time in October, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 23% of October, with mostly cloudy or overcast conditions the remaining 44%. Skies tend to open up as the month goes on.
| 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 (%) | 52 | 53 | 53 | 53 | 54 | 55 | 54 | 54 | 54 | 53 | 54 | 54 | 55 | 55 | 55 | 56 | 57 | 58 | 57 | 57 | 58 | 58 | 59 | 59 | 58 | 59 | 59 | 59 | 58 | 58 | 58 |
| Cloudier (%) | 48 | 47 | 47 | 47 | 46 | 45 | 46 | 46 | 46 | 47 | 46 | 46 | 45 | 45 | 45 | 44 | 43 | 42 | 43 | 43 | 42 | 42 | 41 | 41 | 42 | 41 | 41 | 41 | 42 | 42 | 42 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 52 | 48 |
| 2 | 53 | 47 |
| 3 | 53 | 47 |
| 4 | 53 | 47 |
| 5 | 54 | 46 |
| 6 | 55 | 45 |
| 7 | 54 | 46 |
| 8 | 54 | 46 |
| 9 | 54 | 46 |
| 10 | 53 | 47 |
| 11 | 54 | 46 |
| 12 | 54 | 46 |
| 13 | 55 | 45 |
| 14 | 55 | 45 |
| 15 | 55 | 45 |
| 16 | 56 | 44 |
| 17 | 57 | 43 |
| 18 | 58 | 42 |
| 19 | 57 | 43 |
| 20 | 57 | 43 |
| 21 | 58 | 42 |
| 22 | 58 | 42 |
| 23 | 59 | 41 |
| 24 | 59 | 41 |
| 25 | 58 | 42 |
| 26 | 59 | 41 |
| 27 | 59 | 41 |
| 28 | 59 | 41 |
| 29 | 58 | 42 |
| 30 | 58 | 42 |
| 31 | 58 | 42 |
Chance of precipitation in October
Lạng Sơn gets around 75 mm of rain over 10.9 wet days in October. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 35% and peaks near 44% 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 (%) | 44 | 43 | 42 | 42 | 41 | 41 | 40 | 40 | 39 | 39 | 38 | 38 | 37 | 36 | 36 | 35 | 34 | 34 | 33 | 33 | 32 | 31 | 31 | 30 | 29 | 29 | 28 | 28 | 28 | 28 | 28 |
| Rain chance (%) | |
|---|---|
| 1 | 44 |
| 2 | 43 |
| 3 | 42 |
| 4 | 42 |
| 5 | 41 |
| 6 | 41 |
| 7 | 40 |
| 8 | 40 |
| 9 | 39 |
| 10 | 39 |
| 11 | 38 |
| 12 | 38 |
| 13 | 37 |
| 14 | 36 |
| 15 | 36 |
| 16 | 35 |
| 17 | 34 |
| 18 | 34 |
| 19 | 33 |
| 20 | 33 |
| 21 | 32 |
| 22 | 31 |
| 23 | 31 |
| 24 | 30 |
| 25 | 29 |
| 26 | 29 |
| 27 | 28 |
| 28 | 28 |
| 29 | 28 |
| 30 | 28 |
| 31 | 28 |
Humidity in October
Most of October feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, October lands in the muggy band about 31% of days. Sticky, muggy-or-worse air turns up on roughly 60% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 11 | 12 | 14 | 16 | 17 | 18 | 20 | 21 |
| Comfortable (%) | 6 | 7 | 7 | 8 | 8 | 9 | 9 | 10 | 11 | 11 | 12 | 13 | 13 | 14 | 14 | 15 | 15 | 16 | 16 | 16 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 20 |
| Humid (%) | 14 | 14 | 15 | 16 | 16 | 17 | 18 | 18 | 19 | 20 | 20 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 19 |
| Muggy (%) | 29 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 33 | 33 | 33 | 33 | 33 | 32 | 32 | 31 | 30 | 30 | 29 | 29 | 28 | 28 |
| Oppressive (%) | 45 | 44 | 43 | 42 | 42 | 40 | 39 | 38 | 37 | 35 | 34 | 32 | 31 | 30 | 29 | 27 | 26 | 25 | 24 | 23 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 13 | 12 |
| Miserable (%) | 5 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 0 | 6 | 14 | 29 | 45 | 5 |
| 2 | 0 | 7 | 14 | 30 | 44 | 4 |
| 3 | 0 | 7 | 15 | 30 | 43 | 4 |
| 4 | 0 | 8 | 16 | 30 | 42 | 3 |
| 5 | 0 | 8 | 16 | 31 | 42 | 3 |
| 6 | 1 | 9 | 17 | 31 | 40 | 3 |
| 7 | 1 | 9 | 18 | 31 | 39 | 2 |
| 8 | 1 | 10 | 18 | 31 | 38 | 2 |
| 9 | 1 | 11 | 19 | 31 | 37 | 2 |
| 10 | 1 | 11 | 20 | 31 | 35 | 1 |
| 11 | 1 | 12 | 20 | 32 | 34 | 1 |
| 12 | 1 | 13 | 21 | 32 | 32 | 1 |
| 13 | 1 | 13 | 21 | 32 | 31 | 1 |
| 14 | 2 | 14 | 22 | 32 | 30 | 1 |
| 15 | 2 | 14 | 22 | 32 | 29 | 1 |
| 16 | 3 | 15 | 22 | 32 | 27 | 1 |
| 17 | 3 | 15 | 22 | 32 | 26 | 1 |
| 18 | 4 | 16 | 22 | 33 | 25 | 1 |
| 19 | 5 | 16 | 22 | 33 | 24 | 1 |
| 20 | 6 | 16 | 22 | 33 | 23 | 1 |
| 21 | 7 | 17 | 22 | 33 | 21 | 1 |
| 22 | 8 | 17 | 22 | 33 | 20 | 1 |
| 23 | 9 | 17 | 21 | 32 | 19 | 1 |
| 24 | 11 | 18 | 21 | 32 | 18 | 1 |
| 25 | 12 | 18 | 21 | 31 | 17 | 1 |
| 26 | 14 | 18 | 21 | 30 | 16 | 1 |
| 27 | 16 | 18 | 21 | 30 | 15 | 0 |
| 28 | 17 | 19 | 20 | 29 | 14 | 0 |
| 29 | 18 | 19 | 20 | 29 | 13 | 0 |
| 30 | 20 | 19 | 20 | 28 | 13 | 0 |
| 31 | 21 | 20 | 19 | 28 | 12 | 0 |
Wind in October
Winds average 10 km/h in October.
Across October, daily wind ranges from about 9 km/h on the calmest days to 10 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) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| 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 | 9 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 9 | calm |
| 6 | 9 | calm |
| 7 | 9 | calm |
| 8 | 9 | calm |
| 9 | 9 | calm |
| 10 | 9 | calm |
| 11 | 10 | calm |
| 12 | 10 | calm |
| 13 | 10 | calm |
| 14 | 10 | calm |
| 15 | 10 | calm |
| 16 | 10 | calm |
| 17 | 10 | calm |
| 18 | 10 | calm |
| 19 | 10 | calm |
| 20 | 10 | calm |
| 21 | 10 | calm |
| 22 | 10 | calm |
| 23 | 10 | calm |
| 24 | 10 | calm |
| 25 | 10 | calm |
| 26 | 10 | calm |
| 27 | 10 | calm |
| 28 | 10 | calm |
| 29 | 10 | calm |
| 30 | 10 | calm |
| 31 | 10 | calm |
Sunrise & sunset in October
Daylight runs from about 11 h 48 min at the start of October to 11 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 36 minutes over October. Sunrise moves from 5:48 AM to 6:01 AM, and sunset from 5:36 PM to 5:12 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) | 11.8 | 11.8 | 11.8 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.6 | 11.6 | 11.6 | 11.6 | 11.5 | 11.5 | 11.5 | 11.5 | 11.5 | 11.4 | 11.4 | 11.4 | 11.4 | 11.4 | 11.3 | 11.3 | 11.3 | 11.3 | 11.3 | 11.3 | 11.2 | 11.2 | 11.2 |
| Sunrise (AM) | 5:48 | 5:48 | 5:49 | 5:49 | 5:49 | 5:50 | 5:50 | 5:50 | 5:51 | 5:51 | 5:51 | 5:52 | 5:52 | 5:53 | 5:53 | 5:53 | 5:54 | 5:54 | 5:55 | 5:55 | 5:56 | 5:56 | 5:57 | 5:57 | 5:57 | 5:58 | 5:58 | 5:59 | 6:00 | 6:00 | 6:01 |
| Sunset (PM) | 5:36 | 5:35 | 5:34 | 5:33 | 5:32 | 5:31 | 5:30 | 5:29 | 5:29 | 5:28 | 5:27 | 5:26 | 5:25 | 5:24 | 5:23 | 5:23 | 5:22 | 5:21 | 5:20 | 5:20 | 5:19 | 5:18 | 5:17 | 5:17 | 5:16 | 5:15 | 5:15 | 5:14 | 5:14 | 5:13 | 5:12 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.8 | 5:48 | 5:36 |
| 2 | 11.8 | 5:48 | 5:35 |
| 3 | 11.8 | 5:49 | 5:34 |
| 4 | 11.7 | 5:49 | 5:33 |
| 5 | 11.7 | 5:49 | 5:32 |
| 6 | 11.7 | 5:50 | 5:31 |
| 7 | 11.7 | 5:50 | 5:30 |
| 8 | 11.7 | 5:50 | 5:29 |
| 9 | 11.6 | 5:51 | 5:29 |
| 10 | 11.6 | 5:51 | 5:28 |
| 11 | 11.6 | 5:51 | 5:27 |
| 12 | 11.6 | 5:52 | 5:26 |
| 13 | 11.5 | 5:52 | 5:25 |
| 14 | 11.5 | 5:53 | 5:24 |
| 15 | 11.5 | 5:53 | 5:23 |
| 16 | 11.5 | 5:53 | 5:23 |
| 17 | 11.5 | 5:54 | 5:22 |
| 18 | 11.4 | 5:54 | 5:21 |
| 19 | 11.4 | 5:55 | 5:20 |
| 20 | 11.4 | 5:55 | 5:20 |
| 21 | 11.4 | 5:56 | 5:19 |
| 22 | 11.4 | 5:56 | 5:18 |
| 23 | 11.3 | 5:57 | 5:17 |
| 24 | 11.3 | 5:57 | 5:17 |
| 25 | 11.3 | 5:57 | 5:16 |
| 26 | 11.3 | 5:58 | 5:15 |
| 27 | 11.3 | 5:58 | 5:15 |
| 28 | 11.3 | 5:59 | 5:14 |
| 29 | 11.2 | 6:00 | 5:14 |
| 30 | 11.2 | 6:00 | 5:13 |
| 31 | 11.2 | 6:01 | 5:12 |
Solar energy in October
Average shortwave solar energy reaching the ground each day in October, about 4.15 kWh/m².
For context, solar energy here swings from a low near 2.23 kWh/m² to a high of 4.72 kWh/m² in July across the year — October's 4.15 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) | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.1 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.8 | 3.8 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.5 | Bright |
| 2 | 4.5 | Bright |
| 3 | 4.5 | Bright |
| 4 | 4.4 | Bright |
| 5 | 4.4 | Bright |
| 6 | 4.4 | Bright |
| 7 | 4.4 | Bright |
| 8 | 4.3 | Bright |
| 9 | 4.3 | Bright |
| 10 | 4.3 | Bright |
| 11 | 4.3 | Bright |
| 12 | 4.2 | Bright |
| 13 | 4.2 | Bright |
| 14 | 4.2 | Bright |
| 15 | 4.2 | Bright |
| 16 | 4.1 | Bright |
| 17 | 4.1 | Bright |
| 18 | 4.1 | Bright |
| 19 | 4.1 | Bright |
| 20 | 4.0 | Bright |
| 21 | 4.0 | Bright |
| 22 | 4.0 | Bright |
| 23 | 4.0 | Moderate |
| 24 | 4.0 | Moderate |
| 25 | 3.9 | Moderate |
| 26 | 3.9 | Moderate |
| 27 | 3.9 | Moderate |
| 28 | 3.9 | Moderate |
| 29 | 3.9 | Moderate |
| 30 | 3.8 | Moderate |
| 31 | 3.8 | Moderate |
Hazard calendar for Lạng Sơn
None of Lạng Sơn's seasonal hazards are active in October. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Lạng Sơn's monsoon runs May–September, when most of the year's rain falls.
Is October a good time to visit Lạng Sơn?
Our two travel scores rate October for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
October is a reasonable time to visit Lạng Sơn for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Lạng Sơn in October
From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In October, Lạng Sơn sees daytime highs around 27°C and nights near 20°C. Worth packing: light clothes and rain gear. About 11 days see rain.
UV index in Lạng Sơn in October
Clear-sky midday UV in October peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Lạng Sơn peaks around June 23 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 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) | 6 | 7 | 9 | 7 | 9 | 12 | 12 | 10 | 10 | 8 | 6 | 6 |
| Level | High | High | Very high | High | Very high | Extreme | Extreme | Extreme | Very high | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 6 | High |
| Feb | 7 | High |
| Mar | 9 | Very high |
| Apr | 7 | High |
| May | 9 | Very high |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 10 | Extreme |
| Sep | 10 | Very high |
| Oct | 8 | Very high |
| Nov | 6 | High |
| Dec | 6 | High |
Air quality in Lạng Sơn in October
Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.
Air quality in Lạng Sơn is worst in December — around 58 µg/m³ PM2.5 (unhealthy), about 2.3× the cleanest month (July, 25 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) | 57 | 55 | 55 | 54 | 37 | 29 | 25 | 29 | 36 | 43 | 50 | 58 |
| Level | Unhealthy | Unhealthy | Poor | Poor | Poor | Moderate | Moderate | Moderate | Poor | Poor | Poor | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 57 | Unhealthy |
| Feb | 55 | Unhealthy |
| Mar | 55 | Poor |
| Apr | 54 | Poor |
| May | 37 | Poor |
| Jun | 29 | Moderate |
| Jul | 25 | Moderate |
| Aug | 29 | Moderate |
| Sep | 36 | Poor |
| Oct | 43 | Poor |
| Nov | 50 | Poor |
| Dec | 58 | Unhealthy |
Where is Lạng Sơn?
Lạng Sơn sits at 21.9°N, 106.8°E, 265 m above sea level, in Vietnam. The nearest listed city is Thị Trấn Na Dương, 26 km away.
Topography around Lạng Sơn
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Lạng Sơn.
Within 3 km, the terrain around Lạng Sơn has only modest variations in elevation — a maximum elevation change of 171 m around an average of 282 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 978 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,481 m.
The land around Lạng Sơn is covered by trees (46%) and artificial surfaces (32%) within 3 km, trees (80%) within 16 km, and trees (89%) within 80 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 Lạng Sơn (21.8526°, 106.761°, elevation 265 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).