Vientiane Weather in May
Average highs run from 36°C on May 1 to 33°C on May 31, and lows from 25°C to 25°C. Normal precipitation for the month is 174 mm over about 22 wet days.
May day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
May at a glance
- Average high
- 34°C
- Average low
- 25°C
- Precipitation
- 174 mm
- Reanalysis high
- 44°CMay 7, 2003
- Reanalysis low
- 19°CMay 12, 1999
- Daylight
- 12 h 48 min to 13 h 08 min
- Cloud cover
- 80%
- Humidity
- 70%
- Dew point
- 22°C
- Wind
- 8.3 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 36°C | 25°C | 42°C 1998 | 21°C 2003 | 56% |
| May 2 | 36°C | 25°C | 42°C 2019 | 23°C 1999 | 58% |
| May 3 | 36°C | 25°C | 40°C 2019 | 23°C 2009 | 59% |
| May 4 | 36°C | 25°C | 41°C 1994 | 22°C 2009 | 61% |
| May 5 | 36°C | 25°C | 43°C 2003 | 21°C 2004 | 60% |
| May 6 | 35°C | 25°C | 44°C 2003 | 21°C 2004 | 61% |
| May 7 | 35°C | 25°C | 44°C 2003 | 23°C 2007 | 62% |
| May 8 | 35°C | 25°C | 43°C 2003 | 23°C 2007 | 62% |
| May 9 | 35°C | 25°C | 43°C 1992 | 21°C 2007 | 64% |
| May 10 | 35°C | 25°C | 41°C 2016 | 20°C 1999 | 67% |
| May 11 | 35°C | 25°C | 41°C 2015 | 19°C 1999 | 68% |
| May 12 | 35°C | 25°C | 38°C 2016 | 19°C 1999 | 68% |
| May 13 | 35°C | 25°C | 39°C 1997 | 19°C 1999 | 70% |
| May 14 | 34°C | 25°C | 40°C 2010 | 21°C 2006 | 70% |
| May 15 | 34°C | 25°C | 41°C 2013 | 20°C 2006 | 71% |
| May 16 | 34°C | 25°C | 41°C 2013 | 22°C 2006 | 71% |
| May 17 | 34°C | 25°C | 37°C 2005 | 21°C 2017 | 72% |
| May 18 | 34°C | 25°C | 39°C 2003 | 21°C 2017 | 73% |
| May 19 | 34°C | 25°C | 40°C 2003 | 21°C 2000 | 75% |
| May 20 | 34°C | 25°C | 40°C 2010 | 20°C 2000 | 76% |
| May 21 | 34°C | 25°C | 39°C 2015 | 20°C 2000 | 77% |
| May 22 | 34°C | 25°C | 39°C 2015 | 22°C 2000 | 78% |
| May 23 | 33°C | 25°C | 39°C 2010 | 22°C 2000 | 79% |
| May 24 | 33°C | 25°C | 39°C 2010 | 22°C 1997 | 79% |
| May 25 | 33°C | 25°C | 39°C 2007 | 22°C 1997 | 79% |
| May 26 | 33°C | 25°C | 37°C 2005 | 22°C 2011 | 79% |
| May 27 | 33°C | 25°C | 41°C 2003 | 21°C 2017 | 80% |
| May 28 | 33°C | 25°C | 41°C 2003 | 22°C 2017 | 80% |
| May 29 | 33°C | 25°C | 39°C 2015 | 22°C 2017 | 81% |
| May 30 | 33°C | 25°C | 39°C 2015 | 22°C 2009 | 81% |
| May 31 | 33°C | 25°C | 38°C 1992 | 23°C 1997 | 82% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+7).
- May 1
- sunrise 5:43 AM, sunset 6:31 PM
- May 31
- sunrise 5:33 AM, sunset 6:41 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.