Vientiane weather in March
In March, Vientiane sees average daytime highs of 34°C and overnight lows near 22°C, with 36 mm of rain across 6.2 wet days and about 11.9 hours of daylight. It is the 2nd-warmest and 8th-wettest month of the year here.
Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 62% of the time in March, and the air most often feels muggy.
Daylight stretches from about 11 h 36 min at the start of March to 12 h 06 min by month's end. Set against the rest of the year, March is Vientiane's 4th-clearest and 1st-windiest month. For the whole year in context, see Vientiane's year-round climate.
- Daytime high
- 34°
- 2nd warmest
- Overnight low
- 22°
- 5th coldest
- Rainfall
- 36 mm
- 6.2 wet days
- Daylight
- 11 h 54 min
- 6:23 AM – 6:15 PM
- Cloud cover
- 37%
- 4th clearest
- Wind
- 7 km/h
- 1st windiest
- Solar energy
- 5.85 kWh/m²
- Travel score
- 3.5
- out of 10
Vientiane is capital of Laos.
- Air quality
- High
- PM2.5 25.8 µg/m³ · 2019
- Density
- 215/km²
- people per km²
- Founded
- 1560
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in March
Day-to-day highs hold fairly steady near 34°C through the month.
A typical March day in Vientiane reaches about 34°C in the afternoon and slips back to 22°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 38°C. Set against its neighbours, March runs about 3°C warmer than February and about 1°C cooler than April.
| 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) | 33 | 33 | 33 | 33 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 |
| Avg low (°C) | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 33 | 20 |
| 2 | 33 | 20 |
| 3 | 33 | 21 |
| 4 | 33 | 21 |
| 5 | 33 | 21 |
| 6 | 33 | 21 |
| 7 | 34 | 21 |
| 8 | 34 | 21 |
| 9 | 34 | 21 |
| 10 | 34 | 21 |
| 11 | 34 | 21 |
| 12 | 34 | 22 |
| 13 | 34 | 22 |
| 14 | 34 | 22 |
| 15 | 34 | 22 |
| 16 | 34 | 22 |
| 17 | 34 | 22 |
| 18 | 34 | 22 |
| 19 | 34 | 22 |
| 20 | 34 | 22 |
| 21 | 34 | 23 |
| 22 | 34 | 23 |
| 23 | 34 | 23 |
| 24 | 34 | 23 |
| 25 | 34 | 23 |
| 26 | 34 | 23 |
| 27 | 34 | 23 |
| 28 | 34 | 23 |
| 29 | 34 | 23 |
| 30 | 34 | 23 |
| 31 | 34 | 23 |
How March really feels in Vientiane
Once humidity and wind are folded in, March 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.
The story in March is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Vientiane weather by month
How March compares with the rest of the year at a glance. March is the 2nd-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 | 29° / 17° | 11 | 1.7 | 11 | 6.9 |
| Feb | 31° / 19° | 15 | 2.2 | 11.4 | 5.4 |
| Mar | 34° / 22° | 36 | 6.2 | 11.9 | 3.5 |
| Apr | 35° / 25° | 75 | 11.9 | 12.4 | 2.4 |
| May | 33° / 25° | 262 | 23.4 | 12.8 | 2.2 |
| Jun | 32° / 26° | 316 | 25.1 | 13.1 | 2.2 |
| Jul | 32° / 26° | 372 | 26.5 | 13 | 2.4 |
| Aug | 31° / 25° | 401 | 27.5 | 12.6 | 2.4 |
| Sep | 32° / 25° | 300 | 24.7 | 12.1 | 2.7 |
| Oct | 31° / 24° | 101 | 11.9 | 11.6 | 4.2 |
| Nov | 30° / 21° | 22 | 3 | 11.2 | 5.8 |
| Dec | 29° / 18° | 8 | 1.2 | 10.9 | 7.2 |
Cloud cover in March
The sky is clear or mostly clear about 62% of the time in March.
Beyond those clear spells, partly cloudy skies cover about 15% of March, with mostly cloudy or overcast conditions the remaining 22%. Skies tend to cloud over 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 (%) | 89 | 89 | 89 | 88 | 88 | 87 | 86 | 86 | 85 | 84 | 83 | 81 | 80 | 79 | 77 | 76 | 74 | 74 | 72 | 72 | 71 | 71 | 70 | 70 | 70 | 70 | 70 | 69 | 70 | 70 | 70 |
| Cloudier (%) | 11 | 11 | 11 | 12 | 12 | 13 | 14 | 14 | 15 | 16 | 17 | 19 | 20 | 21 | 23 | 24 | 26 | 26 | 28 | 28 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 31 | 30 | 30 | 30 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 89 | 11 |
| 2 | 89 | 11 |
| 3 | 89 | 11 |
| 4 | 88 | 12 |
| 5 | 88 | 12 |
| 6 | 87 | 13 |
| 7 | 86 | 14 |
| 8 | 86 | 14 |
| 9 | 85 | 15 |
| 10 | 84 | 16 |
| 11 | 83 | 17 |
| 12 | 81 | 19 |
| 13 | 80 | 20 |
| 14 | 79 | 21 |
| 15 | 77 | 23 |
| 16 | 76 | 24 |
| 17 | 74 | 26 |
| 18 | 74 | 26 |
| 19 | 72 | 28 |
| 20 | 72 | 28 |
| 21 | 71 | 29 |
| 22 | 71 | 29 |
| 23 | 70 | 30 |
| 24 | 70 | 30 |
| 25 | 70 | 30 |
| 26 | 70 | 30 |
| 27 | 70 | 30 |
| 28 | 69 | 31 |
| 29 | 70 | 30 |
| 30 | 70 | 30 |
| 31 | 70 | 30 |
Chance of precipitation in March
Vientiane gets around 36 mm of rain over 6.2 wet days in March. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 20% and peaks near 30% on the wettest days. The odds climb 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 (%) | 9 | 9 | 10 | 10 | 11 | 11 | 12 | 13 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 21 | 22 | 23 | 24 | 24 | 25 | 26 | 26 | 27 | 27 | 28 | 28 | 29 | 29 | 30 | 30 |
| Rain chance (%) | |
|---|---|
| 1 | 9 |
| 2 | 9 |
| 3 | 10 |
| 4 | 10 |
| 5 | 11 |
| 6 | 11 |
| 7 | 12 |
| 8 | 13 |
| 9 | 13 |
| 10 | 14 |
| 11 | 15 |
| 12 | 16 |
| 13 | 17 |
| 14 | 18 |
| 15 | 19 |
| 16 | 21 |
| 17 | 22 |
| 18 | 23 |
| 19 | 24 |
| 20 | 24 |
| 21 | 25 |
| 22 | 26 |
| 23 | 26 |
| 24 | 27 |
| 25 | 27 |
| 26 | 28 |
| 27 | 28 |
| 28 | 29 |
| 29 | 29 |
| 30 | 30 |
| 31 | 30 |
Humidity in March
Most of March feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, March lands in the muggy band about 40% of days. Sticky, muggy-or-worse air turns up on roughly 78% 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 (%) | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Comfortable (%) | 10 | 10 | 9 | 8 | 8 | 7 | 7 | 7 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Humid (%) | 26 | 26 | 26 | 25 | 25 | 24 | 23 | 22 | 21 | 20 | 18 | 17 | 16 | 15 | 15 | 14 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 11 | 10 | 10 | 10 | 9 | 8 | 8 | 7 |
| Muggy (%) | 40 | 41 | 42 | 43 | 43 | 44 | 44 | 45 | 45 | 45 | 46 | 46 | 45 | 45 | 44 | 44 | 43 | 42 | 41 | 40 | 38 | 37 | 36 | 35 | 34 | 33 | 32 | 31 | 30 | 29 | 28 |
| Oppressive (%) | 19 | 19 | 19 | 20 | 20 | 21 | 22 | 23 | 24 | 25 | 27 | 29 | 31 | 33 | 35 | 36 | 38 | 40 | 41 | 43 | 44 | 46 | 47 | 49 | 50 | 51 | 51 | 53 | 54 | 55 | 56 |
| Miserable (%) | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 4 | 10 | 26 | 40 | 19 | 0 |
| 2 | 4 | 10 | 26 | 41 | 19 | 0 |
| 3 | 4 | 9 | 26 | 42 | 19 | 0 |
| 4 | 4 | 8 | 25 | 43 | 20 | 1 |
| 5 | 3 | 8 | 25 | 43 | 20 | 1 |
| 6 | 3 | 7 | 24 | 44 | 21 | 1 |
| 7 | 3 | 7 | 23 | 44 | 22 | 1 |
| 8 | 3 | 7 | 22 | 45 | 23 | 1 |
| 9 | 3 | 6 | 21 | 45 | 24 | 1 |
| 10 | 3 | 6 | 20 | 45 | 25 | 1 |
| 11 | 2 | 5 | 18 | 46 | 27 | 1 |
| 12 | 2 | 5 | 17 | 46 | 29 | 1 |
| 13 | 2 | 5 | 16 | 45 | 31 | 1 |
| 14 | 1 | 4 | 15 | 45 | 33 | 1 |
| 15 | 1 | 4 | 15 | 44 | 35 | 1 |
| 16 | 1 | 4 | 14 | 44 | 36 | 1 |
| 17 | 1 | 4 | 13 | 43 | 38 | 1 |
| 18 | 1 | 3 | 13 | 42 | 40 | 2 |
| 19 | 0 | 3 | 12 | 41 | 41 | 2 |
| 20 | 0 | 3 | 12 | 40 | 43 | 2 |
| 21 | 0 | 3 | 12 | 38 | 44 | 2 |
| 22 | 0 | 3 | 11 | 37 | 46 | 2 |
| 23 | 0 | 3 | 11 | 36 | 47 | 2 |
| 24 | 0 | 3 | 11 | 35 | 49 | 2 |
| 25 | 0 | 3 | 10 | 34 | 50 | 3 |
| 26 | 0 | 3 | 10 | 33 | 51 | 3 |
| 27 | 0 | 3 | 10 | 32 | 51 | 4 |
| 28 | 0 | 3 | 9 | 31 | 53 | 4 |
| 29 | 0 | 3 | 8 | 30 | 54 | 5 |
| 30 | 0 | 3 | 8 | 29 | 55 | 5 |
| 31 | 0 | 3 | 7 | 28 | 56 | 6 |
Wind in March
Winds average 7 km/h in March, the windiest month of the year.
Across March, daily wind ranges from about 7 km/h on the calmest days to 7 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) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| 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 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
| 31 | 7 | calm |
Sunrise & sunset in March
Daylight runs from about 11 h 36 min at the start of March to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 30 minutes over March. Sunrise moves from 6:34 AM to 6:11 AM, and sunset from 6:11 PM to 6:19 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) | 11.6 | 11.6 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.8 | 11.8 | 11.8 | 11.8 | 11.8 | 11.8 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 |
| Sunrise (AM) | 6:34 | 6:34 | 6:33 | 6:32 | 6:32 | 6:31 | 6:30 | 6:29 | 6:29 | 6:28 | 6:27 | 6:26 | 6:25 | 6:25 | 6:24 | 6:23 | 6:22 | 6:21 | 6:21 | 6:20 | 6:19 | 6:18 | 6:17 | 6:16 | 6:16 | 6:15 | 6:14 | 6:13 | 6:12 | 6:11 | 6:11 |
| Sunset (PM) | 6:11 | 6:12 | 6:12 | 6:12 | 6:13 | 6:13 | 6:13 | 6:13 | 6:14 | 6:14 | 6:14 | 6:15 | 6:15 | 6:15 | 6:15 | 6:15 | 6:16 | 6:16 | 6:16 | 6:16 | 6:17 | 6:17 | 6:17 | 6:17 | 6:17 | 6:18 | 6:18 | 6:18 | 6:18 | 6:18 | 6:19 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.6 | 6:34 | 6:11 |
| 2 | 11.6 | 6:34 | 6:12 |
| 3 | 11.7 | 6:33 | 6:12 |
| 4 | 11.7 | 6:32 | 6:12 |
| 5 | 11.7 | 6:32 | 6:13 |
| 6 | 11.7 | 6:31 | 6:13 |
| 7 | 11.7 | 6:30 | 6:13 |
| 8 | 11.7 | 6:29 | 6:13 |
| 9 | 11.8 | 6:29 | 6:14 |
| 10 | 11.8 | 6:28 | 6:14 |
| 11 | 11.8 | 6:27 | 6:14 |
| 12 | 11.8 | 6:26 | 6:15 |
| 13 | 11.8 | 6:25 | 6:15 |
| 14 | 11.8 | 6:25 | 6:15 |
| 15 | 11.9 | 6:24 | 6:15 |
| 16 | 11.9 | 6:23 | 6:15 |
| 17 | 11.9 | 6:22 | 6:16 |
| 18 | 11.9 | 6:21 | 6:16 |
| 19 | 11.9 | 6:21 | 6:16 |
| 20 | 11.9 | 6:20 | 6:16 |
| 21 | 12.0 | 6:19 | 6:17 |
| 22 | 12.0 | 6:18 | 6:17 |
| 23 | 12.0 | 6:17 | 6:17 |
| 24 | 12.0 | 6:16 | 6:17 |
| 25 | 12.0 | 6:16 | 6:17 |
| 26 | 12.0 | 6:15 | 6:18 |
| 27 | 12.1 | 6:14 | 6:18 |
| 28 | 12.1 | 6:13 | 6:18 |
| 29 | 12.1 | 6:12 | 6:18 |
| 30 | 12.1 | 6:11 | 6:18 |
| 31 | 12.1 | 6:11 | 6:19 |
Solar energy in March
Average shortwave solar energy reaching the ground each day in March, about 5.85 kWh/m².
For context, solar energy here swings from a low near 4.17 kWh/m² to a high of 6.03 kWh/m² in April across the year — March's 5.85 kWh/m² sits near the top of that range.
| 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) | 5.7 | 5.7 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 6.0 |
| 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 | 5.7 | Bright |
| 2 | 5.7 | Bright |
| 3 | 5.8 | Bright |
| 4 | 5.8 | Bright |
| 5 | 5.8 | Bright |
| 6 | 5.8 | Bright |
| 7 | 5.8 | Bright |
| 8 | 5.8 | Bright |
| 9 | 5.8 | Bright |
| 10 | 5.8 | Bright |
| 11 | 5.9 | Bright |
| 12 | 5.9 | Bright |
| 13 | 5.9 | Bright |
| 14 | 5.9 | Bright |
| 15 | 5.9 | Bright |
| 16 | 5.9 | Bright |
| 17 | 5.9 | Bright |
| 18 | 5.9 | Bright |
| 19 | 5.9 | Bright |
| 20 | 5.9 | Bright |
| 21 | 5.9 | Bright |
| 22 | 5.9 | Bright |
| 23 | 5.9 | Bright |
| 24 | 5.9 | Bright |
| 25 | 5.9 | Bright |
| 26 | 5.9 | Bright |
| 27 | 5.9 | Bright |
| 28 | 5.9 | Bright |
| 29 | 5.9 | Bright |
| 30 | 5.9 | Bright |
| 31 | 6.0 | Bright |
Hazard calendar for Vientiane
In March, Vientiane sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Vientiane sits in the Pacific typhoon belt; the season peaks July–October.
Vientiane's monsoon runs May–September, when most of the year's rain falls.
Is March a good time to visit Vientiane?
Our two travel scores rate March for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
March is a weaker month for outdoor sightseeing in Vientiane. The water and warmth also suit a beach or pool day.
What to pack for Vientiane in March
From March's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In March, Vientiane sees daytime highs around 34°C and nights near 22°C. Pack light clothes. Worth having: sun protection. About 6 days see rain.
UV index in Vientiane in March
Clear-sky midday UV in March peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Vientiane peaks around August 11 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very 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 | 10 | 12 | 10 | 11 | 13 | 13 | 13 | 11 | 10 | 8 | 7 |
| Level | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 10 | Very high |
| Mar | 12 | Extreme |
| Apr | 10 | Extreme |
| May | 11 | Extreme |
| Jun | 13 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 11 | Extreme |
| Oct | 10 | Extreme |
| Nov | 8 | Very high |
| Dec | 7 | Very high |
Air quality in Vientiane in March
Average fine-particle pollution (PM2.5) through the year — so you can see where March falls, not just the annual average.
Air quality in Vientiane is worst in March — around 56 µg/m³ PM2.5 (unhealthy), about 3.4× the cleanest month (July, 16 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Vientiane's WHO annual average of 25.8 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 23 | 32 | 56 | 53 | 23 | 17 | 16 | 17 | 17 | 19 | 18 | 19 |
| Level | Moderate | Moderate | Unhealthy | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 23 | Moderate |
| Feb | 32 | Moderate |
| Mar | 56 | Unhealthy |
| Apr | 53 | Poor |
| May | 23 | Moderate |
| Jun | 17 | Moderate |
| Jul | 16 | Moderate |
| Aug | 17 | Moderate |
| Sep | 17 | Moderate |
| Oct | 19 | Moderate |
| Nov | 18 | Moderate |
| Dec | 19 | Moderate |
Where is Vientiane?
Vientiane sits at 18.0°N, 102.6°E, 174 m above sea level, in Laos. The nearest listed city is Tha Bo, 13 km away.
Topography around Vientiane
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Vientiane.
Within 3 km, the terrain around Vientiane has only modest variations in elevation — a maximum elevation change of 33 m around an average of 171 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 74 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,487 m.
The land around Vientiane is covered by artificial surfaces (53%) within 3 km, cropland (36%) and trees (34%) within 16 km, and trees (57%) and cropland (34%) within 80 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 Vientiane (17.9667°, 102.6°, elevation 174 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).