Longest and shortest day in Seoul
In Seoul, South Korea, the longest day of 2026 is around the June solstice on Sunday, 21 June 2026, with 14h 46m of daylight, and the shortest is around the December solstice on Monday, 21 December 2026, with 9h 34m.
| Turning point | Date | Sunrise | Sunset | Day length |
|---|---|---|---|---|
| March equinox | Friday, 20 March 2026 | 06:36 | 18:43 | 12h 7m |
| June solstice | Sunday, 21 June 2026 | 05:10 | 19:56 | 14h 46m |
| September equinox | Tuesday, 22 September 2026 | 06:19 | 18:29 | 12h 10m |
| December solstice | Monday, 21 December 2026 | 07:42 | 17:17 | 9h 34m |
| Month | Sunrise | Sunset | Day length |
|---|---|---|---|
| January | 07:45 | 17:36 | 9h 51m |
| February | 07:22 | 18:10 | 10h 48m |
| March | 06:44 | 18:38 | 11h 54m |
| April | 05:58 | 19:06 | 13h 9m |
| May | 05:23 | 19:34 | 14h 11m |
| June | 05:10 | 19:54 | 14h 45m |
| July | 05:22 | 19:53 | 14h 31m |
| August | 05:47 | 19:25 | 13h 38m |
| September | 06:13 | 18:40 | 12h 27m |
| October | 06:39 | 17:55 | 11h 16m |
| November | 07:11 | 17:21 | 10h 10m |
| December | 07:39 | 17:14 | 9h 35m |
Why the day gets longer and shorter in Seoul
Earth's axis is tilted about 23.4 degrees, so as the planet orbits the Sun, Seoul 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 Seoul sits from the equator: the further away, the bigger the difference between the longest and shortest day.
Frequently asked questions about day length in Seoul
When is the longest day in Seoul?
The longest day in Seoul falls around the June solstice, on Sunday, 21 June 2026 in 2026, with about 14h 46m of daylight, sunrise at 05:10 and sunset at 19:56.
When is the shortest day in Seoul?
The shortest day in Seoul falls around the December solstice, on Monday, 21 December 2026 in 2026, with about 9h 34m of daylight, sunrise at 07:42 and sunset at 17:17.
How much does day length change through the year in Seoul?
Between the longest and shortest day, Seoul gains and loses about 5h 12m of daylight. The change is fastest around the March and September equinoxes and slowest near the solstices.
Every figure is computed from Seoul's coordinates with SunCalc, not looked up from a table.