Longest and shortest day in Hanoi
In Hanoi, Vietnam, the longest day of 2026 is around the June solstice on Sunday, 21 June 2026, with 13h 25m of daylight, and the shortest is around the December solstice on Monday, 21 December 2026, with 10h 51m.
| Turning point | Date | Sunrise | Sunset | Day length |
|---|---|---|---|---|
| March equinox | Friday, 20 March 2026 | 06:01 | 18:07 | 12h 7m |
| June solstice | Sunday, 21 June 2026 | 05:16 | 18:40 | 13h 25m |
| September equinox | Tuesday, 22 September 2026 | 05:45 | 17:53 | 12h 8m |
| December solstice | Monday, 21 December 2026 | 06:28 | 17:20 | 10h 51m |
| Month | Sunrise | Sunset | Day length |
|---|---|---|---|
| January | 06:36 | 17:35 | 10h 59m |
| February | 06:27 | 17:54 | 11h 27m |
| March | 06:05 | 18:05 | 12h 0m |
| April | 05:38 | 18:15 | 12h 37m |
| May | 05:19 | 18:27 | 13h 8m |
| June | 05:14 | 18:39 | 13h 24m |
| July | 05:23 | 18:41 | 13h 18m |
| August | 05:35 | 18:26 | 12h 51m |
| September | 05:43 | 17:59 | 12h 16m |
| October | 05:52 | 17:32 | 11h 41m |
| November | 06:06 | 17:15 | 11h 9m |
| December | 06:25 | 17:17 | 10h 52m |
Why the day gets longer and shorter in Hanoi
Earth's axis is tilted about 23.4 degrees, so as the planet orbits the Sun, Hanoi 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 Hanoi sits from the equator: the further away, the bigger the difference between the longest and shortest day.
Frequently asked questions about day length in Hanoi
When is the longest day in Hanoi?
The longest day in Hanoi falls around the June solstice, on Sunday, 21 June 2026 in 2026, with about 13h 25m of daylight, sunrise at 05:16 and sunset at 18:40.
When is the shortest day in Hanoi?
The shortest day in Hanoi falls around the December solstice, on Monday, 21 December 2026 in 2026, with about 10h 51m of daylight, sunrise at 06:28 and sunset at 17:20.
How much does day length change through the year in Hanoi?
Between the longest and shortest day, Hanoi gains and loses about 2h 34m of daylight. The change is fastest around the March and September equinoxes and slowest near the solstices.
Every figure is computed from Hanoi's coordinates with SunCalc, not looked up from a table.