Longest and shortest day in Haikou
In Haikou, China, the longest day of 2026 is around the June solstice on Sunday, 21 June 2026, with 13h 21m of daylight, and the shortest is around the December solstice on Monday, 21 December 2026, with 10h 55m.
| Turning point | Date | Sunrise | Sunset | Day length |
|---|---|---|---|---|
| March equinox | Friday, 20 March 2026 | 06:43 | 18:49 | 12h 6m |
| June solstice | Sunday, 21 June 2026 | 06:00 | 19:20 | 13h 21m |
| September equinox | Tuesday, 22 September 2026 | 06:27 | 18:35 | 12h 8m |
| December solstice | Monday, 21 December 2026 | 07:08 | 18:04 | 10h 55m |
| Month | Sunrise | Sunset | Day length |
|---|---|---|---|
| January | 07:16 | 18:19 | 11h 3m |
| February | 07:08 | 18:37 | 11h 29m |
| March | 06:47 | 18:48 | 12h 0m |
| April | 06:21 | 18:56 | 12h 36m |
| May | 06:02 | 19:07 | 13h 5m |
| June | 05:58 | 19:19 | 13h 20m |
| July | 06:07 | 19:21 | 13h 14m |
| August | 06:18 | 19:07 | 12h 49m |
| September | 06:25 | 18:41 | 12h 16m |
| October | 06:33 | 18:15 | 11h 42m |
| November | 06:47 | 17:58 | 11h 12m |
| December | 07:05 | 18:01 | 10h 56m |
Why the day gets longer and shorter in Haikou
Earth's axis is tilted about 23.4 degrees, so as the planet orbits the Sun, Haikou 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 Haikou sits from the equator: the further away, the bigger the difference between the longest and shortest day.
Frequently asked questions about day length in Haikou
When is the longest day in Haikou?
The longest day in Haikou falls around the June solstice, on Sunday, 21 June 2026 in 2026, with about 13h 21m of daylight, sunrise at 06:00 and sunset at 19:20.
When is the shortest day in Haikou?
The shortest day in Haikou falls around the December solstice, on Monday, 21 December 2026 in 2026, with about 10h 55m of daylight, sunrise at 07:08 and sunset at 18:04.
How much does day length change through the year in Haikou?
Between the longest and shortest day, Haikou gains and loses about 2h 26m of daylight. The change is fastest around the March and September equinoxes and slowest near the solstices.
Every figure is computed from Haikou's coordinates with SunCalc, not looked up from a table.