Longest and shortest day in Vientiane
In Vientiane, Laos, the longest day of 2026 is around the June solstice on Sunday, 21 June 2026, with 13h 12m of daylight, and the shortest is around the December solstice on Monday, 21 December 2026, with 11h 3m.
| Turning point | Date | Sunrise | Sunset | Day length |
|---|---|---|---|---|
| March equinox | Friday, 20 March 2026 | 06:14 | 18:20 | 12h 6m |
| June solstice | Sunday, 21 June 2026 | 05:35 | 18:47 | 13h 12m |
| September equinox | Tuesday, 22 September 2026 | 05:58 | 18:06 | 12h 8m |
| December solstice | Monday, 21 December 2026 | 06:35 | 17:39 | 11h 3m |
| Month | Sunrise | Sunset | Day length |
|---|---|---|---|
| January | 06:43 | 17:53 | 11h 10m |
| February | 06:37 | 18:10 | 11h 34m |
| March | 06:18 | 18:19 | 12h 1m |
| April | 05:53 | 18:26 | 12h 32m |
| May | 05:36 | 18:35 | 12h 58m |
| June | 05:34 | 18:46 | 13h 12m |
| July | 05:42 | 18:48 | 13h 6m |
| August | 05:51 | 18:36 | 12h 44m |
| September | 05:57 | 18:12 | 12h 15m |
| October | 06:02 | 17:47 | 11h 45m |
| November | 06:15 | 17:32 | 11h 18m |
| December | 06:32 | 17:36 | 11h 4m |
Why the day gets longer and shorter in Vientiane
Earth's axis is tilted about 23.4 degrees, so as the planet orbits the Sun, Vientiane leans toward the Sun for part of the year and away for the rest. When it leans toward the Sun the days lengthen and the Sun climbs higher; half a year later the opposite happens. The size of the swing depends on how far Vientiane sits from the equator: the further away, the bigger the difference between the longest and shortest day.
Frequently asked questions about day length in Vientiane
When is the longest day in Vientiane?
The longest day in Vientiane falls around the June solstice, on Sunday, 21 June 2026 in 2026, with about 13h 12m of daylight, sunrise at 05:35 and sunset at 18:47.
When is the shortest day in Vientiane?
The shortest day in Vientiane falls around the December solstice, on Monday, 21 December 2026 in 2026, with about 11h 3m of daylight, sunrise at 06:35 and sunset at 17:39.
How much does day length change through the year in Vientiane?
Between the longest and shortest day, Vientiane gains and loses about 2h 9m of daylight. The change is fastest around the March and September equinoxes and slowest near the solstices.
Every figure is computed from Vientiane's coordinates with SunCalc, not looked up from a table.