Longest and shortest day in Surabaya
In Surabaya, Indonesia, the longest day of 2026 is around the December solstice on Monday, 21 December 2026, with 12h 33m of daylight, and the shortest is around the June solstice on Sunday, 21 June 2026, with 11h 42m.
| Turning point | Date | Sunrise | Sunset | Day length |
|---|---|---|---|---|
| March equinox | Friday, 20 March 2026 | 05:33 | 17:39 | 12h 7m |
| June solstice | Sunday, 21 June 2026 | 05:39 | 17:21 | 11h 42m |
| September equinox | Tuesday, 22 September 2026 | 05:18 | 17:24 | 12h 6m |
| December solstice | Monday, 21 December 2026 | 05:10 | 17:43 | 12h 33m |
| Month | Sunrise | Sunset | Day length |
|---|---|---|---|
| January | 05:23 | 17:53 | 12h 30m |
| February | 05:33 | 17:53 | 12h 20m |
| March | 05:33 | 17:42 | 12h 9m |
| April | 05:30 | 17:27 | 11h 57m |
| May | 05:31 | 17:18 | 11h 47m |
| June | 05:38 | 17:20 | 11h 42m |
| July | 05:42 | 17:27 | 11h 44m |
| August | 05:37 | 17:29 | 11h 52m |
| September | 05:22 | 17:26 | 12h 3m |
| October | 05:07 | 17:22 | 12h 15m |
| November | 05:00 | 17:26 | 12h 27m |
| December | 05:07 | 17:40 | 12h 33m |
Why the day gets longer and shorter in Surabaya
Earth's axis is tilted about 23.4 degrees, so as the planet orbits the Sun, Surabaya 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 Surabaya sits from the equator: the further away, the bigger the difference between the longest and shortest day.
Frequently asked questions about day length in Surabaya
When is the longest day in Surabaya?
The longest day in Surabaya falls around the December solstice, on Monday, 21 December 2026 in 2026, with about 12h 33m of daylight, sunrise at 05:10 and sunset at 17:43.
When is the shortest day in Surabaya?
The shortest day in Surabaya falls around the June solstice, on Sunday, 21 June 2026 in 2026, with about 11h 42m of daylight, sunrise at 05:39 and sunset at 17:21.
How much does day length change through the year in Surabaya?
Between the longest and shortest day, Surabaya gains and loses about 0h 51m of daylight. The change is fastest around the March and September equinoxes and slowest near the solstices.
Every figure is computed from Surabaya's coordinates with SunCalc, not looked up from a table.